Class / Patent application number | Description | Number of patent applications / Date published |
318721000 | Responsive to rotor shaft position or speed | 30 |
20080203962 | APPARATUS AND METHOD FOR DRIVING SYNCHRONOUS MOTOR - The synchronous motor driving apparatus including position sensors provided in the synchronous motor, a current polarity detection circuit for detecting the polarities of the currents in the respective phase windings of the synchronous motor, an inverter driving the synchronous motor, a motor speed calculation unit calculating the rotational speed of the synchronous motor depending on the output signals from the position sensors, a speed control unit outputting a first voltage adjusting component (q-axis current command value Iq*) to cause the rotational speed of the synchronous motor to approach a speed command value and a phase control unit outputting a second voltage adjusting component (d-axis current command value Id*) to cause the phase differences between the phases of the position sensor signals and of the currents in the respective phase windings of the synchronous motor to become a predetermined value. | 08-28-2008 |
20080315823 | Control and Power Device for a Rotating Electrical Machine - A control and power device for a rotating electrical machine comprising a management circuit and a power circuit including a number of power transistors and driver circuits associated with the power transistors. The invention is characterized in that it comprises connection means between the management circuit and the driver circuits for switching on the driver circuits and transmitting at least one transit potential between the management circuit and the driver circuits. The invention is applicable to alternator-starter. | 12-25-2008 |
20090072778 | LOW SPEED SYNCHRONOUS MOTOR DRIVE OPERATION - Methods and apparatus are provided for providing a torque boost in an electric motor system at low speeds. The electric motor system comprises an alternating current (AC) synchronous electric motor, an inverter and a controller. The inverter is coupled to the AC synchronous electric motor and provides electric control therefore. The controller is coupled to the inverter and provides operational control signals thereto for operation of the electric motor. The controller includes a torque command gain block which modifies a torque command to generate a boosted torque signal in response to a detected speed of the electric motor, the torque command modified to define the boosted torque signal defined in accordance with a torque dependent scaling factor calculated in response to the torque command. | 03-19-2009 |
20100019716 | MOTOR CONTROLLER AND ELECTRIC POWER TOOL HAVING THE SAME - A motor controller is provided with a first PWM circuit that repeatedly outputs an on-signal at a first carrier frequency, a second PWM circuit that repeatedly outputs an on-signal at a second carrier frequency that is lower than the first carrier frequency, an AND circuit that receives both the on-signal outputted from the first PWM circuit and the on-signal outputted from the second PWM circuit and outputs a third on-signal which is a logical product of the received on-signals, and a voltage apply circuit that applies a voltage to the motor intermittently in synchronization with the third on-signal outputted from the AND circuit. At least one of the first carrier frequency and the second carrier frequency is equal to or lower than 1 kHz or equal to or higher than 3 kHz. As a result, generation of an unpleasant noise by a motor controller using two PWM circuits may be suppressed. | 01-28-2010 |
20100188037 | Control System Without Position Sensors for a Synchronous Electric Motor - The control system comprises: a switch (TR) in series with a winding (W) of the motor (M) between two terminals (A, B) which are connected to a supply of an alternating voltage (V), a first detector circuit ( | 07-29-2010 |
20100219787 | MOTOR DRIVE SYSTEM FOR DRIVING MOTOR PROVIDED WITH A PLURALITY OF WINDINGS - A motor drive system is provided with a plurality of axis control parts for outputting PWM commands using a position command, a plurality of current supply parts which supply current to the respective windings based on the PWM commands of the respective axis control parts, and which are connected to the respective windings, a motor position detector for outputting a signal of a rotor position of the motor, a first signal supply part for supplying the output signal to one current supply part of the plurality of current supply parts, and a second signal supply part for supplying the signal supplied through the first signal supply part to an axis control part corresponding to one current supply part, and the corresponding axis control part outputs a PWM command based on the signal supplied from the one current supply part through the second signal supply part to the corresponding axis control part and the position command, and the remaining axis control part outputs the PWM command based on the signal supplied from the corresponding axis control part to the remaining axis control parts and the position command. Thereby, a motor drive system capable of driving a plurality of inverters can be made simple. | 09-02-2010 |
20100244764 | APPARATUS FOR SENSORLESS POSITIONING WITH SIGNAL AMPLIFIER - A device and a method for determining the current position of a rotor, particularly the angle of rotation of the rotor, of an electric motor, wherein said device determines the current position of the rotor using the fluctuations of the armature current or the armature voltage of the electric motor. The fluctuations of the armature current or the armature voltage are separated from the fluctuations of the motor current or the motor voltage with the help of an amplifier unit dependent on a controllable offset value. The offset value is changed according to the motor current or the motor voltage. By virtue of the device and the method, the fluctuations of the armature current or the armature voltage can be separated from the fluctuations of the motor current or the motor voltage over the full measurement range of the motor current or the motor voltage. | 09-30-2010 |
20100327797 | MOTOR CONTROL APPARATUS AND IMAGE FORMING APPARATUS - A motor control apparatus for controlling a DC motor includes a first detection unit configured to detect an angular velocity of the DC motor, a driven member configured to be driven by the DC motor, a control unit configured to perform, during start-up of the DC motor, feed forward control for changing a control value used for controlling drive of the DC motor from a first control value corresponding to an angular velocity smaller than a target angular velocity to a second control value corresponding to the target angular velocity, and to change the feed forward control to feedback control for controlling the control value based on a detection result by the first detection unit to keep the DC motor at the target angular velocity, and a second detection unit configured to detect whether the driven member has been replaced. | 12-30-2010 |
20110018485 | APPARATUS AND METHOD FOR DRIVING SYNCHRONOUS MOTOR - The synchronous motor driving apparatus including position sensors provided in the synchronous motor, a current polarity detection circuit for detecting the polarities of the currents in the respective phase windings of the synchronous motor, an inverter driving the synchronous motor, a motor speed calculation unit calculating the rotational speed of the synchronous motor depending on the output signals from the position sensors, a speed control unit outputting a first voltage adjusting component (q-axis current command value Iq*) to cause the rotational speed of the synchronous motor to approach a speed command value and a phase control unit outputting a second voltage adjusting component (d-axis current command value Id*) to cause the phase differences between the phases of the position sensor signals and of the currents in the respective phase windings of the synchronous motor to become a predetermined value. | 01-27-2011 |
20110050153 | Control mechanism for accelerating magnetically suspended rotor - The present invention is a propulsion apparatus that is magnetically maintained and accelerated. The apparatus comprises a rotor rotating in a stator, the rotor magnetically maintained for rotation without friction by magnets situated in and on the rotor and stator. The rotor is rotated by pairs of magnets fixed to the rotor and stator. The first magnet of each magnet pair is fixed at a rotor placement point and the second magnet of each magnet pair is fixed on the stator at a fixed stator point. The second magnet of each magnet pair is an electromagnet that is activated by a control device. A vertical axis is defined such that the vertical axis passes through the center of rotation of the rotor. Each stator placement point is a point on a first line defined by kα, where α is a divisor of 360 degrees. Each rotor placement point is a point on a second line that is rotated β with respect to the first line. The control device selects m≧1 pairs of second magnets for activation to cause rotation of the rotor. If the first of the second magnet pair activated is on a line at γ with respect to the vertical axis, the second of the second magnet pair is on a line at −γ with respect to the vertical axis. | 03-03-2011 |
20110115424 | METHOD FOR DETERMINING THE POSITION OF A ROTOR OF A SYNCHRONOUS MACHINE HAVING AT LEAST ONE EXCITATION WINDING - A method for determining the position at rest of a rotor of a machine having at least one excitation winding. The invention provides a technique for detecting the position of the rotor at rest, from information contained in the voltages produced at the terminals of the stator windings, when the voltage applied to the rotor winding undergoes variations. The invention thus makes it possible to detect the rest position of the wound-rotor machine in the absence of ordinary position sensors such as magnetic, optical, resolving, mechanical, capacitive or other sensors. | 05-19-2011 |
20110254498 | Constant-Speed Control Circuit for BLDC Motors - A speed-control circuit for a BLDC motor is provided. The speed-control circuit includes a pulse generator, a current source circuit, a filter circuit, an error amplification circuit and a PWM circuit. The pulse generator detects a speed signal of the BLDC motor to generate a pulse signal. The filter circuit is coupled to the current source circuit to generate an average signal. The error amplification circuit receives the average signal and a speed-reference signal for generating a speed-control signal. The PWM circuit generates a switching signal to drive the BLDC motor in response to the speed-control signal. A pulse width of the switching signal is determined by the speed-control signal. | 10-20-2011 |
20110260673 | MOTOR CONTROLLING APPARATUS AND METHOD OF THE SAME - Disclosed herein is a motor control apparatus and a method thereof. The operation efficiency of a compressor may be maintained by using a sensorless algorithm, sampling a current applied to a motor more than twice within a period of the triangular carrier wave for performing pulse width modulation to calculate a reference voltage, driving the motor according to the calculated reference voltage to improve control resolution, and performing a high-speed operation while reducing a volume of the compressor, without adding a separate hardware when controlling the operation of the motor provided in the compressor at a high speed. | 10-27-2011 |
20120019187 | METHOD FOR CONTROLLING A PERMANENT MAGNET SYNCHRONOUS ELECTRIC MOTOR AT STEADY-STATE, ELECTRONIC DEVICE FOR IMPLEMENTING SAID METHOD AND MOTOR ASSEMBLY COMPRISING SAID ELECTRONIC DEVICE - A method, which is efficient and cost-effective to implement, for controlling, at steady-state, a synchronous electric motor comprising a permanent magnet rotor and a stator provided with windings connected to an electrical grid by means of a switch controlled by a processing unit, said method comprising the following steps: periodically switching on said switch by means of a PWM output of said processing unit; continuously verifying the shift with respect to an ideal operating condition of the motor; and modifying the switched on period of the switch in feedback to approach said ideal operating condition of the motor. | 01-26-2012 |
20120056576 | Power Train for a Transport Vehicle, in Particular a Rail Vehicle, and Method for Controlling Same - A power train for a transport vehicle is provided. The power train includes an electric motor comprising a shaft, a stator and a rotor, a power supply system receiving direct input voltage and delivering a polyphase voltage to the motor. The system has a modulation factor equal to the voltage amplitude of each phase of the motor divided by the direct input voltage, and includes a sensor for the rotational speed of the rotor. The power train includes a control device for varying the modulation factor that is adapted to decrease the modulation factor relative to the modulation factor in the absence of a device for varying the modulation factor, when the speed of rotation of the rotor belongs to a first interval of values below a predetermined transition value, and adapted to increase the modulation factor relative to the modulation factor in the absence of a device for varying the modulation factor, when the speed of rotation of the rotor belongs to a second interval of values greater than the predetermined transition value. A method and transport vehicle are also provided. | 03-08-2012 |
20120062164 | APPARATUS AND METHOD OF CONTROLLING AN ELECTRIC OIL PUMP DRIVING MOTOR - In an apparatus for controlling a sensorless electric motor that drives an electric oil pump, in a case where a rotational speed of the motor deviates from a first range defined between a first upper limit value and a first lower limit value, a rotational speed limiting section generates a current command signal acting for controlling the rotational speed of the motor to suppress deviation of the rotational speed of the motor from the first range, and in a case where deviation of the rotational speed of the motor from the first range is continued for a predetermined time or more, the rotational speed limiting section sets a second range defined between a second upper limit value and a second lower limit value which are respectively displaced from the first upper limit value and the first lower limit value in a direction in which the deviation is continued. | 03-15-2012 |
20120081064 | CONTROL OF AN ELECTRICAL MACHINE - A method of controlling an electrical machine that includes exciting a phase winding with a supply voltage, and freewheeling the phase winding when current in the phase winding exceeds a threshold. The threshold is then adjusted in response to changes in the supply voltage and/or the speed of the electrical machine. Additionally, a control system that implements the method and an electrical machine comprising the control system are described. | 04-05-2012 |
20120161688 | SYNCHRONOUS-MACHINE STARTING DEVICE - A synchronous-machine starting device includes an electric power conversion unit for converting supplied electric power into AC power for supply to the armature of the synchronous machine, a rotor position detection unit for detecting a position of the rotor of the synchronous machine based on an AC voltage in the armature of the synchronous machine detected by an AC voltage detection unit, an electric power conversion control unit for controlling the electric power conversion unit based on the position of the rotor detected by the rotor position detection unit, and an abnormality detection unit detecting a rotation abnormality of the synchronous machine based on the AC voltage detected by the AC voltage detection unit after supply of the field current to the rotor of the synchronous machine is started. | 06-28-2012 |
20120187892 | AIRCRAFT MOTOR DRIVE CONTROL APPARATUS AND AIRCRAFT MOTOR DRIVE CONTROL SYSTEM - The command signal processing unit outputs, when a first PWM frequency command signal is received, a high-PWM frequency command signal such that an asynchronous PWM control is performed at a PWM frequency of a predetermined constant frequency. The command signal processing unit outputs, when a second | 07-26-2012 |
20120299525 | VENTILATION APPARATUS WITH FEEDBACK COMPENSATION CONTROL AND METHOD FOR OPERATING THE SAME - A ventilation apparatus with a two-section feedback compensation control and a method for operating the same are disclosed. The ventilation apparatus includes a power conversion trait ( | 11-29-2012 |
20120313566 | DEVICE FOR OPERATING SYNCHRONOUS MOTORS AND ASSOCIATED METHOD - The synchronous motors are controlled by a three-phase AC power controller. According to an embodiment of the invention, firing points for the AC power controller are determined. A pair of two or three phases is determined from the angular position of the rotor, for which the firing points can be present for the respective A.C power controller. Actual firing points are determined from the mains voltage phase position of the phases so that only positive torque is produced. | 12-13-2012 |
20130026967 | METHOD FOR STARTING A PERMANENT MAGNET SINGLE-PHASE SYNCHRONOUS ELECTRIC MOTOR AND ELECTRONIC DEVICE FOR IMPLEMENTING SAID METHOD - A method for starting a permanent magnet single-phase synchronous electric motor which includes a permanent magnet rotor and a stator with windings, and which is connected to an electrical grid by a switch. The method includes: a first starting attempt in which the windings are fed in current with first starting impulses generated only during the half-periods of a first polarity of the voltage of the electrical grid; a first control step which detects whether a starting condition has been obtained in the first starting attempt; and, if the first control step does not detect that the starting condition has been obtained within the term of the first starting attempt, a second starting attempt in which the windings are fed in current with second starting impulses generated only during the half-periods of a second polarity that is opposite to the first polarity of the voltage of the electrical grid. | 01-31-2013 |
20130057193 | Synchronous Motor Drive System and Synchronous Motor - In sequentially selecting and driving two phases of the three-phase stator windings of a synchronous motor, detect a speed electromotive voltage of a de-energized phase, relate the speed electromotive voltage to rotor position information beforehand, then count rotor position information backward based on the detected the speed electromotive voltage to estimate rotor position; and then detect rotation speed from the change rate of the rotor position information so as to achieve highly accurate position and speed control. | 03-07-2013 |
20130154540 | MOTOR CONTROLLING CIRCUIT, MOTOR DRIVING DEVICE, AND MOTOR CONTROLLING METHOD - There are provided a motor controlling circuit, a motor driving device, and a motor controlling method. The motor controlling circuit includes: a frequency detecting unit detecting a frequency of an internal clock signal of a motor driving circuit; a sampling unit sampling an input pulse width modulation (PWM) signal using the frequency of the internal clock signal; and a calculating unit sensing a change in a speed of the internal clock signal from a sampling result of the sampling unit and calculating a revolution per minute (RPM) of a motor from the sensed change in the speed. | 06-20-2013 |
20130181654 | MOTOR DRIVE SYSTEM EMPLOYING AN ACTIVE RECTIFIER - An active rectifier controller controls operation of an active rectifier employed in a power conversion system that supplies a direct current (DC) output to an inverter that converts the DC output to an AC output supplied to an AC motor. The active rectifier controller includes a field-oriented control (FOC) controller that monitors an alternating current (AC) input currents provided to the active rectifier, the DC output provided to the inverter, and speed of the AC motor. The FOC controller selects a reference DC output value based on the speed of the AC motor and compares the monitored DC output to the reference DC output as part of the FOC control algorithm used to generate control signals. A PWM signal generator generates PWM signals for controlling the active rectifier based on the control signals. | 07-18-2013 |
20140103854 | INVERTER CONTROL METHOD AND SYSTEM FOR ECO-FRIENDLY VEHICLE - Disclosed is an inverter control system and method for an eco-friendly vehicle, by which overall improvements can be obtained in terms of switching loss, electromagnetic performance, noise-vibration-harshness (NVH) performance, control stability, and so forth, when compared to a conventional case in which one fixed switching frequency and one fixed sampling frequency are used over the entire operation area. To this end, the inverter control method for an eco-friendly vehicle which generates a pulse width modulation (PWM) signal according to a switching frequency and a sampling frequency and controls ON/OFF driving of a switching element, in which a controller changes and sets the switching frequency according to a current motor speed, changes and sets a sampling frequency according to the switching frequency, and controls on/off driving of a switching element according to the switching frequency corresponding to the motor speed and the sampling frequency. | 04-17-2014 |
20140197774 | METHOD AND APPARATUS FOR CONTROLLING POWER CONVERTER WITH INVERTER OUTPUT FILTER - Power converters and methods are presented for driving an AC load connected through an intervening filter circuit, in which at least one filter current or voltage signal or value is determined according to feedback signals or values representing an output parameter at an AC output of the power converter, and AC electrical output power is generated at the AC output based at least partially on the at least one filter current or voltage signal or value. | 07-17-2014 |
20150061566 | CONTROL CIRCUIT FOR DRIVING MOTOR AND METHOD FOR CONTROLLING SPEED OF MOTOR - A control circuit for driving a motor and a method for controlling a speed of a motor are provided. The control circuit comprises a microcontroller and a drive circuit. The microcontroller has a memory. The drive circuit is configured to drive the BLDC motor according to a control of the microcontroller. The memory include a RPM table, and the microcontroller sends a duty signal to the drive circuit to change a speed of the motor according to the RPM table. | 03-05-2015 |
20150084574 | SYSTEM FOR CONTROLLING A SYNCHRONOUS ELECTRIC MOTOR - A control system included in a speed selector connected by output phases to a synchronous electric motor, the synchronous electric motor being controlled according to a control law implemented by the speed selector. A first speed of the synchronous electric motor is determined by a first speed estimator. A second speed estimator is used to determine a second speed of the synchronous electric motor. The system includes a signal generator module configured to apply, to the output phases, voltages taking account of a non-constant current signal. The second speed estimator is configured to recover the current response on the output phases, to deduce therefrom the second speed of the synchronous electric motor. | 03-26-2015 |
20150097510 | MOTOR DRIVING DEVICE AND CONTROL METHOD OF MOTOR DRIVING DEVICE - A motor driving device includes a control unit which outputs a pre-driving signal to control a motor based on command information of an input target number of rotations and detection information of a number of rotations of the motor, and a motor driving unit which drives the motor based on the pre-driving signal. The control unit includes a speed control circuit which outputs speed command information based on the command information of the target number of rotations and the detection information, a stop control circuit which when an input of the command information of the target number of rotations is stopped, outputs stop command information after a predetermined time elapses from detection of stop of the motor, and a driving signal generation circuit which generates a control signal based on the stop command information and the speed command information. | 04-09-2015 |