Class / Patent application number | Description | Number of patent applications / Date published |
318806000 | Condition responsive | 16 |
20080218119 | Method for operating a delta wound three-phase permanent magnet brushless motor - Method for operating a delta wound three-phase permanent magnet brushless motor. A transition speed is determined in a quadrant of a speed versus torque curve above which speed continues to increase while current/torque decreases wherein actual phase current can be controlled in a current control modification manner which reduces requested phase current. The modification manner is determined for a quadrant, wherein a controller can use the modification manner to reduce the requested phase current to control the actual phase current when the speed is above the transition speed. The motor is controlled in a quadrant wherein, when the motor has a speed above the transition speed, the controller reduces the requested phase current in the modification manner and the controller supplies the actual phase current to the motor using the reduced requested phase current and using measured phase current of the motor derived from using a single current sense resistor. | 09-11-2008 |
20090051311 | SYSTEM AND METHOD FOR DETERMINING STATOR WINDING RESISTANCE IN AN AC MOTOR - A system and method for determining stator winding resistance in an AC motor is disclosed. The system includes a circuit having an input connectable to an AC source and an output connectable to an input terminal of an AC motor. The circuit includes at least one contactor and at least one switch to control current flow and terminal voltages in the AC motor. The system also includes a controller connected to the circuit and configured to modify a switching time of the at least one switch to create a DC component in an output of the system corresponding to an input to the AC motor and determine a stator winding resistance of the AC motor based on the injected DC component of the voltage and current. | 02-26-2009 |
20090128084 | MOTOR HAVING CONTROLLABLE TORQUE - A controllable motor includes a rotor. A first stator winding set is operable, upon being energized, to generate and apply a first torque to the rotor. A second stator winding set independent of the first stator winding set is operable, upon being energized, to generate and apply a second torque to the rotor. A motor control is coupled to the first and second stator winding sets. The motor control is operable to selectively energize one of the first or second stator winding sets to thereby generate and apply one of the first or second torques to the rotor, and simultaneously energize both the first and second stator winding sets to thereby generate and apply a third torque greater than the first or the second torque. | 05-21-2009 |
20090167236 | Control Apparatus for AC Rotary Machine and Control Method for AC Rotary Machine - A control apparatus for an AC rotary machine, comprising a VVVF inverter | 07-02-2009 |
20090189561 | ELECTRIC MOTOR STATOR WINDING TEMPERATURE ESTIMATION - A temperature estimation controller and methods are provided for controlling a torque command to prevent overheating of one or more of a plurality of phases of a permanent magnet motor. The temperature estimation controller includes a low speed temperature estimation module, a transition module and a temperature dependent torque command derater block. The low speed temperature estimation module determines a stator temperature of each of a plurality of phases of the permanent magnet motor in response to first thermal impedances measured for each of the plurality of phases with respect to a thermal neutral. The transition module is coupled to the low speed temperature estimation module and outputs the stator temperature of each of a plurality of phases of the permanent magnet motor as determined by the low speed temperature estimation module when a detected speed of the permanent magnet motor is less than a first predetermined speed. The temperature dependent torque command derater block is coupled to the transition module and derates the torque command in response to the stator temperature of one or more of the plurality of phases. | 07-30-2009 |
20100148719 | Power Control For Induction Motors Using Variable Frequency AC Power - An autonomous controller allows an AC induction motor to operate over a broad range of AC power supply frequencies by reducing the amount of current supplied to the motor at lower frequencies. The controller detects the frequency of the power supply and switches the supply current on and off during each AC cycle to limit the RMS current to a value that is related to the detected frequency. Alternatively, the controller switches capacitive reactance into the power supply circuit which reduces the current supplied to the motor at lower AC frequencies. | 06-17-2010 |
20100201304 | METHOD FOR CONTROLLING A ROTARY ELECTRIC MACHINE IN CASE OF LOAD SHEDDING AND CORRESPONDING POWER CONTROL MODULE - A method for controlling a rotary electrical machine and a control and power module for a rotary electrical machine. The rotary electrical machine includes a plurality of phase windings ( | 08-12-2010 |
20110018488 | FREQUENCY-CHANGING CONTROL APPARATUS - A frequency-changing control apparatus includes a rectification circuit, a control circuit, and a frequency-changing driving circuit. The control circuit includes a microprocessor. The frequency-changing control apparatus has variable voltage variable frequency for driving a motor. A temperature detection unit and an alarm device are connected to the microprocessor. The temperature detection unit is able to detect the temperature of the circumstance and convert a temperature value into a signal to be transmitted to the microprocessor for generating an alarm effect via the alarm device so that the operator could know the time of maintenance beforehand, preventing the apparatus from stopping suddenly because of superheat. The present invention is able to decrease the reject rate, reduce the loss of material, and cut down the maintenance cost. | 01-27-2011 |
20120038311 | Apparatus And Method For Rotating-Sensorless Identification Of Mechanical Parameters Of A Three-Phase Asynchronous Motor - A method for the identification without shaft encoder of magnetomechanical characteristic quantities of a three-phase asynchronous comprising: constant voltage impression U | 02-16-2012 |
20120242273 | VARIABLE FREQUENCE DRIVE AND ROTATION SPEED SEARCHING APPARATUS FOR AN INDUCTION MOTOR - Provided is a variable frequency drive and a rotation speed searching apparatus for an induction motor incorporated therein. The rotation speed searching apparatus is featured by scanning the rotor frequency of the induction motor and determining either the error between a detected DC-bus voltage and a set DC-bus voltage or the error between a detected output current and a set output current, so that the rotation speed of the induction motor can be searched out. | 09-27-2012 |
20130106340 | ELECTRIC MOTOR, STEERING DEVICE AND METHOD | 05-02-2013 |
20130271061 | METHOD FOR CONTROLLING AN ASYNCHRONOUS MACHINE HAVING A CONVERTER IN A MANNER THAT IS OPTIMAL FOR (COPPER) LOSS - The invention relates to a method for the open-loop or closed-loop control of an asynchronous machine with or without speed feedback, the asynchronous motor being controlled by a control device (converter or servo converter). First of all, a voltage vector rotating at a rotary field frequency is specified and impressed, both the rotary field frequency and the voltage vector being determined by an open-loop or closed-loop control based on a voltage-frequency characteristic curve configured in any manner and the voltage vector being adapted by a cos φ closed-loop control. Desired values of cos φ are calculated using rating plate data and equivalent circuit diagram data for an optimum-loss or loss-optimised operation of the asynchronous machine for the calculation of cos φ | 10-17-2013 |
20150048775 | MOTOR CONTROLLER WITH INTEGRATED METERING FUNCTION - A motor controller is provided with integrated metering and data logger functions to measure, store and report information suitable to verify the controller's energy saving performance. The integrated functions in the controller can be used to establish an AC motor's baseline electrical power and energy profile and to monitor continuously the power and energy reduction performance of the controller without requiring a separate meter and logger. | 02-19-2015 |
20150130393 | SOLID-STATE RELAY FOR RUNNING DIRECTION CONTROL OF THREE-PHASE ALTERNATING CURRENT MOTOR AND METHOD THEREOF - A solid state relay for controlling a three-phase AC motor running direction is provided, a driver module, power components module, phase sequence detection module, phase lack detection module, and automatic phase correction and phase lack protection logic module. The input of the phase sequence detection module is connected to the three-phase power supply, and the output is connected to the automatic phase correction and phase lack protection logic module, to provide phase sequence detection and a phase sequence signal to the automatic phase correction and phase lack protection logic module. The input of the phase lack detection module is connected to the three-phase power supply, and the output is connected to the automatic phase correction and phase lack protection logic module, to detect a lack of phase and provide the lacking phase signal to the automatic phase correction and phase lack protection logic module. | 05-14-2015 |
20160079905 | ENERGY SAVING METHOD FOR USE WITH ACTIVE PWM RECTIFIERS IN REGENERATIVE DRIVES - As described herein, a drive circuit for a three phase AC motor comprises an AC/AC converter. The converter has an input for receiving multiphase AC power from an AC source and converting the AC power to variable voltage and variable frequency from the AC source for driving the AC motor. A filter circuit is connected to the AC/AC converter and comprises at least one inductor per phase and at least one capacitor per phase. The capacitors are connected in a broken wye configuration with one side connected to one of the inductors and an opposite side connected via a three phase diode bridge rectifier to a switch. The switch is controlled by a converter control to selectively open or short a neutral point of the broken wye capacitor configuration. | 03-17-2016 |
20160142004 | VEHICLE CONTROL DEVICE AND RAILROAD VEHICLE - A vehicle control device according to one embodiment includes an inverter converting a DC power to a three-phase AC power and supplying the three-phase AC power to a motor driving a vehicle. A detector detects a current value between the inverter and the motor. A controller PWM-controls the inverter based on a current value detected by the detector, a speed command signal, and a rotor frequency of the motor. The controller determines occurrence of a malfunction when a PWM modulation rate is equal to or higher than a predetermined value and the rotor frequency is equal to or lower than a predetermined value. | 05-19-2016 |