Class / Patent application number | Description | Number of patent applications / Date published |
318400150 | With torque or load determination (e.g., by calculation, detection, or estimation, etc.) | 60 |
20090009113 | Digital control of motor drives - A digital controller for controlling variable speed and dynamic torque applications of an electric motor. The controller includes a state observer monitoring a torque load requirement and sending a signal based on the torque load requirement, and a digital control unit for receiving the signal from the state observer and sending an output to the electric motor. The output is a value that corresponds to a first motor operating state or a second motor operating state. | 01-08-2009 |
20090066276 | Method for Operating a Rotating Electrical Machine - A method is specified for operating a rotating electrical machine, in which the rotating electrical machine is connected in terms of phase to a converter circuit, having a DC voltage circuit, for connecting at least two voltage levels, and the phases of the converter circuit are connected to the DC voltage circuit in accordance with a selected switching state combination of switching states for power semiconductor switches in the converter circuit. In order for operation of the rotating electrical machine to be possible in an event, over a number L of sampling times various values are determined, and a switching state combination is set as the selected switching state combination with which a sum of determined values is at its smallest. | 03-12-2009 |
20090091278 | Downhole Load Sharing Motor Assembly - A motor assembly of multiple motors for use in driving a shared downhole load within a well. In particular, the assembly may employ substantially constant adjustable speed motors. These may include permanent magnet synchronous machine motors. The motors may be configured to operate at given speeds that may be downwardly adjusted depending on the amount of torque output independently exhibited by the individual motors. In this manner, a significant divergence in torque output between the motors may be avoided so as to ensure substantial load sharing between all of the motors of the assembly. | 04-09-2009 |
20090096395 | MOTOR DRIVE DEVICE - The present motor control device detects from the speed of a motor and a current driving the motor that the motor is overloaded, and exerts control to set a target torque based on the detected overload state of the motor to cause the motor to output a maximal torque that the motor can output, intermittently within a preset allowable speed range. If the motor is overloaded, the motor's output torque is not decreased and a drive circuit can also be protected. | 04-16-2009 |
20090102405 | Motor controller of air conditioner and method of the motor controller - The present invention relates to a motor controller for an air conditioner and a motor control method. The motor controller including a converter converting AC utility power into DC power and an inverter having a plurality of switching elements, the inverter receiving the DC power, converting the received DC power into AC power by switching operations of the switching elements, and supplies the AC power to a motor, the motor controller further including: a current detector detecting a current flowing in the motor controller; a temperature detector detecting a temperature in the motor controller or a temperature ambient to the motor controller; and a controller calculating a loading based on at least one of room temperature, setup temperature, and inner unit capacity and setting up a final target frequency for driving the motor based on the calculated loading and at least one of the detected current and the detected temperature. The motor controller for the air conditioner and the motor control method determines a target frequency considering a current and a temperature, to reduce power consumption and protect circuit elements. | 04-23-2009 |
20090160379 | METHOD FOR CONTROLLING A VEHICLE DRIVE UNIT - A method for controlling a vehicle drive unit, the vehicle drive unit having at least two individual motors. A total actual torque is continuously compared with an allowable total torque, the total actual torque being calculated from individual actual torque values of the at least two individual motors, and the allowable total torque being calculated from the allowable individual torque values of the at least two individual motors, and an error response being initiated if the comparison establishes that the total actual torque is greater than the allowable total torque. | 06-25-2009 |
20090160380 | Motor Drive Device and Control Method Thereof - A torque command (Tht) used in the calculation of a voltage command (Vht) of a voltage-up converter is generated by adding an upper limit value value (Tc_max) of damping control that can be set by a motor drive device with a target drive torque (Tbt). Accordingly, the torque command (Tht) exhibits a waveform absent of variation, differing from a torque command (Tcmd) that is generated by adding damping torque generated based on revolution count variation component with the target drive torque (Tbt). Therefore, the voltage command (Vht) calculated based on the torque command (Tht) exhibits a waveform absent of variation. Accordingly, increase in current passing through the voltage-up converter caused by variation in the voltage command (Vht) can be suppressed. As a result, power loss at the voltage-up converter is reduced and operation of the motor at high efficiency can be realized. Further, the voltage-up converter can be protected from element fracture. | 06-25-2009 |
20090160381 | APPARATUS FOR CONTROLLING TORQUE OF ELECTRIC ROTATING MACHINE - The apparatus is for controlling a torque of an electric rotating machine at a command torque by supplying command voltages in accordance with the command torque to a power conversion circuit driving the electrical rotating machine. The apparatus includes a detecting function of detecting an input voltage of the power conversion circuit to be power-converted and thereafter applied to the electric rotating machine as a drive voltage, and a control function of setting a command current corresponding to one of two current components in a 2-phase coordinate system of the electric rotating machine in accordance with a command torque directed from outside, and thereafter determining command voltages corresponding to two voltage components of the 2-phase coordinate system on the basis of the command current and the input voltage of the power conversion circuit. | 06-25-2009 |
20090167222 | METHOD AND DEVICE FOR DETERMINING THE TORQUE OF AN ELECTRIC MACHINE - A method for determining the torque of an electric machine, in particular a permanently energized electric machine. The torque is determined by a particularly simple and accurate method by measuring a phase voltage and the rotational speed of the electric machine and calculating the torque based on these values. | 07-02-2009 |
20090237021 | APPARATUS FOR CARRYING OUT IMPROVED CONTROL OF ROTARY MACHINE - In an apparatus, a norm setter sets, based on a request torque for a rotary machine and a rotational velocity of a rotor, a norm of a vector of an a output voltage in a two-phase rotating coordinate system defined in the rotor. A phase setter sets, based on a deviation between a generated torque and the request torque, a phase of the vector of the output voltage of the power converter in the two-phase rotating coordinate system. A drive signal determiner determines, based on the norm set by the norm setter and the phase set by the phase setter, a drive signal, and applies the drive signal to a switching member to thereby drive the switching member such that the generated torque is adjusted to the request torque. | 09-24-2009 |
20090267550 | Motor Control Device And Generator Control Device - To estimate a fluctuation component of the torque generated at the motor accurately, a motor control device ( | 10-29-2009 |
20100045220 | CONTROL APPARATUS AND CONTROL METHOD FOR HYBRID VEHICLE - A first motor generator-control unit (MG | 02-25-2010 |
20100060218 | BLOWER MOTOR FOR HVAC SYSTEMS - A blower motor assembly having a variable speed motor that is suitable for direct, drop-in replacement in a residential HVAC (heating, ventilation, and air conditioning) system that employs a PSC motor. The blower motor assembly includes at least a neutral input and two hot AC line connections, one for connection to the heating power source and the other to the cooling power source. A sensing circuit senses which of the inputs is energized by sensing either voltage or current on the inputs. The sensing circuit delivers a corresponding signal to a motor controller to control the speed of the variable speed motor. The blower motor assembly may also be equipped with additional hot AC inputs, more than one neutral line, and several sensing circuits for sensing current or voltage in the hot inputs and/or the neutral lines for controlling various aspects of the variable speed motor. | 03-11-2010 |
20100117575 | Method and Device for Determining the Motor Constant of an Electric Motor - The invention concerns a method and a device for determining the motor moment constant k | 05-13-2010 |
20100127649 | POWER CONTROLLER FOR ELECTRIC VEHICLE - A controller calculates a total power fluctuation including a power fluctuation on a first unit and a power fluctuation on a second unit. The controller estimate a voltage fluctuation of the system voltage based on the total power fluctuation. Then, the controller calculates a control amount for a voltage converter by reflecting the estimated voltage fluctuation. The estimated voltage fluctuation can be used to correct a feed-forward control amount. As a result, a voltage stabilizing control is performed based on the estimated voltage fluctuation which could be occurred in response to the total power fluctuation if no stabilizing control is performed. Thereby, the stability of the system voltage can be improved without using a large size smoothing capacitor. | 05-27-2010 |
20100134056 | CONTROL DEVICE AND CONTROL SYSTEM FOR ELECTRIC ROTATING MACHINE - A control device has a unit for determining a controlled phase of a controlled voltage outputted from an inverter to a generator according to a difference between a target torque and an estimated torque of the generator, a unit for calculating an instructed vector norm of the controlled voltage from the target torque, an electrical angular speed of the generator and parameters indicating characteristics of the generator, a unit for correcting the instructed norm to an adjusted vector norm such that a phase of current flowing through the generator in response to the controlled voltage set at the controlled phase and the adjusted norm is controlled to a phase of an instructed current determined from the target torque, and a unit for controlling the generator by controlling the inverter to output the controlled voltage set at the controlled phase and the adjusted norm to the generator. | 06-03-2010 |
20100207557 | CONTROL OF SYNCHRONOUS ELECTRICAL MACHINES - A synchronous motor having phase windings which are split or tapped and in which the conduction angle of the applied alternating current is varied at one or more taps to allow the motor to start in a controlled direction and be torque controlled to synchronous speed. | 08-19-2010 |
20100207558 | ELECTRIC POWER STEERING APPARATUS - A voltage detector | 08-19-2010 |
20100315030 | TORQUE HARMONIC REDUCTION CONTROL FOR SWITCHED RELUCTANCE MACHINES - A controller for a switched reluctance machine (SRM) generates current commands that reduce torque harmonics generated by the SRM. The controller monitors the phase currents and rotor position of the SRM to estimate torque generated by the SRM. The current command signal is modified based on the difference between the torque command and the estimated torque. A multiplier that varies with the monitored torque command is applied to the modified current command to provide a smooth phase-to-phase transition. | 12-16-2010 |
20110050137 | APPARATUS FOR CARRYING OUT IMPROVED CONTROL OF ROTARY MACHINE - In an apparatus, a predicting unit predicts, based on a target value of a drive mode of a power converter at a next timing, a first value of a controlled variable. The drive mode is indicative of a switching-state of each of a plurality of switching elements. The target value of the drive mode of the power converter at the next timing is temporarily set at a present timing prior to the next timing. A driving unit drives the plurality of switching elements based on the target value of the drive mode at the next timing while limiting a number of switching-state changes in the plurality of switching elements from the present timing to the next timing as long as the deviation between the predicted first value of the controlled variable at the further next timing and a command value therefor is within a threshold range. | 03-03-2011 |
20110140643 | ELECTRIC MOTOR TORQUE ESTIMATION - A method of controlling a vehicle including a permanent magnet (PM) synchronous motor is provided. The motor is calibrated such that for each torque command, there are corresponding direct-axis (d-axis) and quadrature axis (q-axis) current commands. The method includes establishing a torque command T*. D-axis and q-axis current commands Id* and Iq*, respectively, corresponding to the torque command T* are determined. The motor is controlled based on Id* and Iq*. D-axis and q-axis currents Id and Iq, respectively, are measured. An output torque is estimated as a sum of the torque command T* and a torque difference. The torque difference is determined as a function of Id*, Iq*, Id, and Iq. The vehicle may be controlled based on the estimated output torque. | 06-16-2011 |
20110193507 | Method, Controller, and Power Converter for Controlling a Single-Switch Based Switched Reluctance Machine - A method for controlling a multi-phase motor includes withholding energization of a first phase of the motor for a non-zero period when the first phase's dwell time begins. Energization of the first phase is activated upon the expiration of the non-zero period. Energization of the first phase is deactivated for the remainder of the dwell time at a deactivation time occurring before or at the expiration of the dwell time. | 08-11-2011 |
20120126732 | MOTOR DRIVER AND VEHICLE USING THE SAME - A motor driver includes a control portion, for performing variable control on a torque or rotation speed of a motor through a control signal; and an output mode selection circuit, for sending an indication to the control portion when the control signal is abnormal, so that the motor enters an action status corresponding to a selection signal. | 05-24-2012 |
20120194109 | POWER CONVERSION DEVICE - A power conversion device includes a first inverter circuit and a second inverter circuit, a capacitor, and a microcomputer. The microcomputer switches a control operation, according to the steering state of a steering wheel, between a first state where a first duty center value is shifted to be lower than an output center value and a second duty center value is shifted to be higher than the output center value, and a second state where the first duty center value is shifted to be higher than the output center value and the second duty center value is shifted to be lower than the output center value. This can reduce a difference in heat loss between FETs while reducing the ripple current of the capacitor. | 08-02-2012 |
20120206074 | Method and Apparatus for Load Dependent Speed Control of a Motor - A variable speed power converter controls the speed of a load in a material handling system as a function of the torque required to move the load. While the power converter is running, the torque being produced in the motor is determined. The power converter then determines the maximum rotational speed of the motor as a function of the torque currently being produced and of the torque-speed curve of the motor. The power converter then commands the motor to rotate at this maximum rotational speed. The power converter periodically monitors the torque being produced and adjusts the maximum rotational speed of the motor throughout the run. | 08-16-2012 |
20120206075 | POWER INVERTER AND ELECTRIC POWER STEERING CONTROLLER - A power inverter is provided that can apply to an AC rotary machine three-phase voltages of high amplitudes and low distortion while suppressing ohmic loss attributed to current detection resisters. The power inverter includes a superimposed voltage command computing means for computing and outputting a superimposed voltage command depending on the difference between a maximum value and a minimum value of three-phase voltage commands; a voltage command modification means for adding the superimposed voltage command to each of the three-phase voltage commands and outputting modified three-phase voltage commands; and a power output means for outputting the three-phase voltages based on the modified three-phase voltage commands. | 08-16-2012 |
20120262099 | JACK-UP PLATFORM - A jack-up platform ( | 10-18-2012 |
20130026959 | CONTROL DEVICE THAT DETECTS WHETHER OR NOT IRREVERSIBLE DEMAGNETIZATION HAS OCCURRED IN PERMANENT MAGNET OF PERMANENT MAGNET SYNCHRONOUS MOTOR - An estimated torque constant calculation unit calculates an estimated torque constant relating to the permanent magnet synchronous motor from a current representative value and an acceleration representative value acquired from a plurality of current values and a plurality of acceleration values in the same operation state over a plurality of periods of a sinusoidal command signal and a predetermined inertia relating to the permanent magnet synchronous motor. A demagnetization detection unit detects whether or not irreversible demagnetization has occurred in the permanent magnet of the permanent magnet synchronous motor based on a difference between the estimated torque constant and a predetermined torque constant relating to the permanent magnet synchronous motor. | 01-31-2013 |
20130057186 | MOTOR CONTROL DEVICE - A motor control device including: a following control unit that calculates a pre-correction torque command based on a difference between an operation command signal for commanding an operation of a motor and a detection signal resulting from detecting an operation of the motor; an adder that outputs a post-correction torque command by adding the pre-correction torque command to a correction torque command; and an electric-current control unit that outputs a drive current driving the motor based on the post-correction torque command, wherein the motor control device executes control so that the detection signal matches the operation command signal, and further including: a reference-periodic-signal computation unit; an amplitude/phase estimation unit; and a correction-torque computation unit, so that the correction torque command is updated such that a difference between the correction torque command and the post-correction torque command becomes smaller. | 03-07-2013 |
20130076283 | MOTOR CONTROL UNIT AND MOTOR CONTROL UNIT FOR VEHICLE STEERING APPARATUS - A motor control unit controls a motor including a rotor and a stator facing the rotor. A current drive unit drives the motor at an axis current value of a rotating coordinate system that rotates in accordance with a control angle that is a rotational angle used in a control. An addition angle calculation unit calculates an addition angle to be added to the control angle. A control angle calculation unit obtains, at every predetermined calculation cycle, a present value of the control angle by adding the addition angle that is calculated by the addition angle calculation unit to an immediately preceding value of the control angle. A torque detection unit detects a torque that is other than a motor torque and that is applied to a drive target driven by the motor. A command torque setting unit sets a command torque to be applied to the drive target. An addition angle correction unit compares the command torque set by the command torque setting unit with the detected torque detected by the torque detection unit, and corrects the addition angle based on a comparison result. | 03-28-2013 |
20130106330 | RECTIFIER AND INVERTER BASED TORSIONAL MODE DAMPING SYSTEM AND METHOD | 05-02-2013 |
20130221885 | SENSORLESS AC MOTOR CONTROLLER - A controller for an AC electric motor, includes a Feed Forward Torque Controller and a load model. The Torque controller directly derives a torque related component of applied motor voltages from a signal representing a torque command input T* and at least one motor parameter. The load model derives a motor speed value including a model of motor speed behaviour of the AC electric motor to provide an output signal which represents the motor speed of the AC electric motor. This motor speed output signal is used in determining a frequency of rotation of an applied motor voltage vector. Where an input to the load model is the signal representing the torque command input T*, the load model uses the signal representing the torque command T*, at least over a part of an operating speed range of the AC motor which includes zero speed, to determine the motor speed output signal. | 08-29-2013 |
20130241452 | ELECTRIC POWER STEERING APPARATUS - Motor control command output means outputs, as a motor control command, a second command value, which is calculated by second command value calculating means on the basis of a first command value generated by first command value calculating means and a current value obtained by causing motor driving system current adding means to add together currents of respective motor driving systems, to the motor driving systems of two systems constituted by a motor and drive circuits for driving the motor. The second command value calculating means may calculate the second command value by performing a d/q coordinate system current feedback calculation using the current value. | 09-19-2013 |
20130257327 | MULTI-PHASE MULTI-POLE ELECTRIC MACHINE - A multi-phase multi-pole electric machine attached to a vehicle. The multi-phase multi-pole electric machine includes rotor, stator with five phase windings, machine controller, and torque sensors. The machine controller controls the flow of current. The torque sensors senses the torque exerted by the vehicle and transmits the information to the machine controller. The machine controller provides four degree of control through injection of five phase currents and thus providing higher torque. | 10-03-2013 |
20130334994 | METHODS AND SYSTEMS FOR AUTOMATIC ROTATION DIRECTION DETERMINATION OF ELECTRONICALLY COMMUTATED MOTOR - A method for determining a direction of rotation for an electronically commutated motor (ECM) is described. The motor is configured to rotate a blower and the method comprises rotating the blower using the ECM and determining if the resulting blower rotation is indicative of the desired direction of rotation for the blower. | 12-19-2013 |
20140001989 | Method for Operating an Electric Motor | 01-02-2014 |
20140015459 | Switched Reluctance Motor Torque Estimation - A drive system has a switched reluctance motor (SR motor) and a control system configured to determine an estimated total torque of SR motor as a function of the phase voltages and phase currents of the phases of the SR motor. | 01-16-2014 |
20140070741 | ELECTRIC MACHINE TORQUE CAPABILITY DETERMINATION - A vehicle comprises an electric machine configured with at least one controller issuing torque commands with the use of a voltage bus. The controller may be configured to respond to a torque requests based on multiple vehicle system inputs including vehicle speed, position of the accelerator pedal and brake pedal, and various other vehicle data. The controller may respond to a torque request that exceeds a threshold value by issuing torque commands for the electric machine based on a speed of the electric machine and a voltage on the bus. Based on the speed of the electric machine and voltage on the bus, the controller may issue a constant torque output by the electric machine as the speed and voltage vary. Calculating a ratio using speed of the electric machine to voltage on the bus to determine torque capability may result as a constant torque when the ratio is constant. | 03-13-2014 |
20140253002 | SYSTEM FOR REDUCING TORQUE RIPPLE IN AN ELECTRIC MOTOR - A motor control system is provided. The motor control system includes a motor, a position sensor, a current sensor, and a control module. The motor has a rotor and a stator. The motor generates an output torque based on a phase current applied to the motor. The output torque generated by the motor creates a torque ripple that is within a predefined range. The position sensor monitors the motor to determine a rotor position. The current sensor monitors the motor to determine the phase current. The control module is in communication with the motor, the position sensor, and the current sensor. The control module includes a lookup table that stores values of phase current commands. The control module determines a phase current command from the lookup table based on the rotor position and the phase current. | 09-11-2014 |
20140265956 | METHODS AND SYSTEMS FOR CONTROLLING AN ELECTRIC MOTOR - A system and method of controlling an electric motor using a motor controller are provided. The system includes an electric motor controller configured to be coupled to an electric motor and to control the electric motor to produce approximately constant average torque. The controller includes a rectifier configured to convert an AC input voltage to a pulsing DC voltage, a DC link electrically coupled to the rectifier, an inverter electrically coupled to the DC link and configured to generate a three phase AC voltage to drive the electric motor, and a controller configured to receive a measurement of a motor current value for the motor, estimate a torque generated in the electric motor using the measurement of the instantaneous motor current value, and generate a real-time current demand signal using the estimated torque value, the real-time current demand signal compensating the motor controller to produce a substantially constant average motor output torque. | 09-18-2014 |
20140265957 | METHOD FOR CORRECTING TORQUE FOR SUBSTITUTING PERMANENT-SPLIT CAPACITORMOTOR BY ELECTRONICALLY-COMMUTATED MOTOR - A method for correcting torque including: presetting rotational speed of each gear by corresponding gear input lines of a microprocessor; providing a mechanism to select one rotational speed set; electing N power points within a range of the rated power, acquiring a set of torque data corresponding to each set of the rotational speed at each power point, and storing a total 2×N sets of torque data; allowing the motor to enter the torque correction mode; recording a steady torque Tadj when the motor operates in a steady state; and comparing the steady torque Tadj with a maximum gear torque Tmax, and selecting the set of torque data to which T[M]max belongs when the steady torque Tadj satisfies the relationship: 110%×T[M−1]max09-18-2014 | |
20140292240 | CONTROL DEVICE FOR VEHICLE GENERATOR-MOTOR AND CONTROL METHOD THEREFOR - Provided are a low-cost control device and the like for a vehicle generator-motor for minimizing the number of current sensors and the like, and estimating an output torque and a current consumption during drive of the generator-motor. The output torque and the current consumption during the drive of the generator-motor are estimated based on a field current, an rpm, a DC voltage, and a phase of an AC voltage to be supplied of the generator-motor, without providing a current sensor for detecting an input current from a power supply to an inverter device of the generator-motor, and a current sensor for detecting an output current from the inverter device to an armature winding of a rotary electric machine. | 10-02-2014 |
20140306627 | ROTARY DRIVE SYSTEM, METHOD FOR CONTROLLING AN INVERTER AND ASSOCIATED COMPUTER PROGRAM - The rotary drive system includes: a direct voltage source ( | 10-16-2014 |
20140340012 | MOTOR DRIVE APPARATUS - To suppress a ripple contained in current flowing into a DC power supply during one-pulse control in a motor drive apparatus receiving electric power from the DC power supply. A motor drive apparatus | 11-20-2014 |
20140346985 | DRIVE INVERTER HAVING A TORQUE ERROR DETECTOR - An inverter, which drives an electric motor installed in a road vehicle, includes sensors, a storage apparatus, a power calculator, a torque calculator, a deviation calculator, and a torque corrector. The sensors measure at least one voltage and at least one current within the inverter. The storage apparatus records values measured during an electric revolution of the motor. Following the electric revolution, the power calculator calculates a mean electric power based on the recorded values. From the mean electric power and a rotational speed of the motor during the electric revolution, the torque calculator calculates a torque produced on an output shaft of the motor, The deviation calculator determines a deviation between the torque produced on the output shaft and a setpoint torque of the inverter. When an absolute value of the deviation is greater than a predetermined threshold, the torque corrector makes a torque correction. | 11-27-2014 |
20140375237 | Determination of Hysteresis Controller Band for IPMSM-Based Drive System - Methods of providing a control band for a hysteresis controller are presented. A method can determine a control band analytically to avoid the time and costs associated with manual calibration of a hysteresis controller. By way of example, a method can include modeling a machine output, such as stator flux or machine torque, modeling the variation rate for the machine output, and providing a control band based on the variation rate modeling. | 12-25-2014 |
20150015171 | APPARATUS FOR CARRYING OUT IMPROVED CONTROL OF ROTARY MACHINE - In an apparatus for controlling a variable of a rotary machine based on an AC voltage supplied to the rotary machine via a switching element of a power converter, a generator generates a drive signal including an on-off pattern of the switching element. A driver drives, based on the on-off pattern of the drive signal, the switching element. A parameter monitor monitors a parameter indicative of change of a harmonic current flowing in the rotary machine based on a harmonic voltage included in the AC voltage. A limiter limits, based on the parameter monitored by the parameter detector, generation of the drive signal by the generator to limit an increase of a level of the harmonic current. | 01-15-2015 |
20150022130 | MOTOR CONTROL APPARATUS, MOTOR-DRIVEN APPARATUS, METHOD OF CONTROLLING MOTOR AND NON-TRANSITORY COMPUTER-READABLE RECORDING MEDIUM STORING A COMPUTER PROGRAM - The motor control apparatus controlling rotation of a brushless motor includes a controller to control an angular velocity of the motor, and a load torque calculator to calculate a load torque at which the motor drives a driven member, by using a detection signal output from a rotation detector to output the detection signal in response to the rotation of the motor. When the motor drives the driven member toward a target stop position, the controller calculates a deceleration rotation amount, which is a remaining rotation amount of the motor at start of deceleration of the motor from its drive state that is one of an acceleration state and a constant velocity state, and controls the angular velocity of the motor on a basis of the deceleration rotation amount. The controller calculates the deceleration rotation amount by using the load torque calculated in the drive state. | 01-22-2015 |
20150028782 | Traction Motor Retarding Flux Reference - A traction motor system calculates motor flux by generating a real time effective resistance of a resistance grid calculated from motor torque and measured voltage on a DC link. Calculating effective resistance avoids solely relying on DC link voltage, which can be influenced by conditions such as wheel slip and drop out of one or more resistance grids. The effective resistance calculation is based on nominal motor values using known power levels and conditions. From these nominal values and the effective resistance, various scaling factors based on actual motor power can be generated and used to adjust a nominal flux reference to more accurately reflect actual motor flux. The scaling factors include power and torque scaling factors and a resistance scaling factor that is active during conditions such as wheel slip. | 01-29-2015 |
20150061557 | ELECTRIC MOTOR CONTROL DEVICE AND ELECTRIC MOTOR CONTROL METHOD - An electric motor control device includes: a motor constant generator configured to generate a motor constant by using a temperature; a current control unit configured to generate a current command value to an electric motor based on the motor constant and a torque command value and execute a current control mode; a voltage phase control unit configured to calculate a torque estimation value of the electric motor and execute a voltage phase control mode in which a feedback operation is performed for a voltage phase based on the difference between the torque estimation value and the torque command value; and a control mode switching unit configured to switch to the voltage phase control mode in a high rotation area where a flux weakening control is performed. The torque estimation value is calculated using the motor constant common to generation of the current command value in the current control mode. | 03-05-2015 |
20150077027 | LOAD TORQUE ESTIMATION APPARATUS, IMAGE FORMING APPARATUS, LOAD TORQUE ESTIMATION METHOD AND NON-TRANSITORY COMPUTER-READABLE INFORMATION RECORDING MEDIUM - A load torque estimation apparatus inputs a controlling value for controlling the electric motor and an actually measured value of a rotational speed of the electric motor to a model to estimate load torque of the electric motor; and derives a mechanical time constant of the electric motor corresponding to the load torque estimated by the estimation part. The load torque estimation apparatus updates the mechanical time constant included in the model by using the mechanical time constant corresponding to the load torque estimated at an (n−1)th control period (where n denotes an integer greater than or equal to 2) and estimates the load torque of the electric motor at an nth control period by inputting the controlling value and the actually measured value acquired at the nth control period to the model acquired through the updating. | 03-19-2015 |
20150077028 | LOAD TORQUE ESTIMATION APPARATUS, IMAGE FORMING APPARATUS, LOAD TORQUE ESTIMATION METHOD AND NON-TRANSITORY COMPUTER-READABLE INFORMATION RECORDING MEDIUM - A load torque estimation apparatus estimates load torque of an electric motor. The apparatus includes an estimation part configured to input a controlling value for controlling the electric motor and an actually measured value of a rotational speed of the electric motor to a model and estimating load torque of the electric motor; and a derivation part configured to derive a mechanical time constant of the electric motor corresponding to the actually measured value of the rotational speed of the electric motor. The estimation part is configured to update, according to a timing of acquiring the actually measured value of the rotational speed of the electric motor, the mechanical time constant included in the model by using the mechanical time constant corresponding to the acquired actually measured value and estimate the load torque of the electric motor by using the updated model. | 03-19-2015 |
20150091482 | VARIABLE SPEED FAN MOTOR - A variable speed fan motor, including a variable speed motor body and a motor controller. The motor controller includes a microprocessor, an inverter circuit, a gear detection circuit, and a power supply. The gear detection circuit includes a plurality of current sensing units. Only one of the power input lines is in an energized state, and remaining power input lines are in a deenergized state. Each power input line is connected to one current sensing unit. An output end of the current sensing unit is connected to an input end of the microprocessor. The microprocessor selects operating parameters of the motor according to a detected signal of energization state of each power input line. The microprocessor is connected to the series communication unit. The microprocessor communicates with an external device via the series communication unit. | 04-02-2015 |
20150137719 | APPARATUS FOR CONTROLLING 3-PHASE MOTOR AND METHOD FOR MAINTAINING HIGH TORQUE THEREIN - Provided are an apparatus for controlling a 3-phase motor and a method for maintaining a high torque therein, which are capable of preventing excessive heat generation in a coil, through which a phase current flows, by causing an AC current to flow in a specific phase when a 3-phase motor maintains a high torque. The apparatus for controlling the 3-phase motor includes: a sensor configured to sense torques flowing through three phases of the 3-phase motor; and a controller configured to determine whether the torques of the three phases, which are detected by the sensor, maintain a high torque, and to perform control such that, when it is determined that the detected torques maintain the high torque, a DC signal is applied to a specific phase among the three phases and an AC signal is applied to the other phases. | 05-21-2015 |
20150137720 | SYNCHRONOUS MACHINE CONTROL DEVICE - A synchronous machine control means is provided with a magnet state output means ( | 05-21-2015 |
20150137721 | POWER TOOL - A power tool comprises a motor, an output torque calculation unit configured to calculate an output torque of the motor based on a current flowing through the motor, a friction torque calculation unit configured to calculate a friction torque of the motor based on a rotation speed of the motor, a load torque estimation unit configured to estimate a load torque acting on the motor, an inertia torque calculation unit configured to calculate an inertia torque based on the output torque, the friction torque and the load torque, and a motor deceleration unit configured to stop or decelerate the motor when the inertia torque is greater than an inertia torque reference value. | 05-21-2015 |
20150145447 | MOTOR CONTROL DEVICE AND IMAGE FORMING APPARATUS WITH THE SAME - A motor control device includes a motor device, a speed command section, and a load detecting section. The motor control device includes: a motor configured to drive a rotating body and output a speed notification signal having an oscillation frequency corresponding to a rotational speed of the rotating body; and a driver IC configured to control a rotational speed of the motor. The speed command section is provided outside the motor device and configured to output a speed command signal designating a rotational speed of the motor to the driver IC. The load detecting section is provided outside the motor device and configured to derive a phase difference between the speed command signal and the speed notification signal and detect a load on the motor based on the phase difference. | 05-28-2015 |
20150381083 | MOTOR CONTROL APPARATUS AND METHOD - An apparatus for controlling an AC power supply for an electric motor, said AC power supply being derived from a DC voltage. The apparatus comprises a comparer configured to provide a comparison of a modulation index of a motor control signal with a reference value. This current data provider is configured to provide current data based on a torque demand signal; a speed signal indicating the speed of rotation of the AC motor; and an indication of the DC voltage modified on the comparison for control of the motor control signal which is based on the motor current data. | 12-31-2015 |
20160056738 | APPARATUS AND METHOD FOR COMPENSATING FOR TORQUE FOR CURRENT ORDER OF DRIVING MOTOR - An apparatus for compensating for a torque for a current order of a driving motor includes: a current order generator configured to: i) receive a torque order (Tref*), ii) generate a magnetic flux-based current order map using a generated driving point ratio (1/λ max), and iii) generate a current order using the generated current order map; and an iron loss torque compensator configured to extract an iron loss torque compensation value for the generated current order and a speed (Wrpm) of the driving motor. | 02-25-2016 |
20160065100 | MOTOR CONTROL APPARATUS - A motor control apparatus includes a counter, a margin calculation portion, and a cycle set portion. The counter counts a total number of switching the current supply phase of the coils when the rotor is rotationally driven. A rotation angle of the rotor is detected on a basis of the number of switching. The margin calculation portion calculates a torque margin that is a difference between an output torque of the motor and a load torque acting on the motor. The cycle set portion sets a current supply switching cycle to shorten as the torque margin is greater. The current supply switching cycle is a cycle switching the current supply phase of the coils. | 03-03-2016 |