Abstract: A stepping motor control device includes a position detection sensor configured to detect a rotation position of a stepping motor, a voltage controller configured to drive the stepping motor, an advance angle controller configured to control an advance angle that is a phase difference between an excitation current applied to a coil of the stepping motor and the rotation position of the stepping motor, and a speed controller configured to control a drive speed of the stepping motor. The speed controller controls the drive speed using, in combination, voltage control by the voltage controller and advance angle control by the advance angle controller.

Abstract: A circuit for thermal protection and power regulation as a function of the current winding temperature of phase windings of an electric motor. The circuit including at least one temperature monitor switch (TW1, TW2) that measures the winding temperature of the phase windings, and that upon attainment of a specific winding temperature shuts off the winding current flowing through the windings, the circuit further including a PTC thermistor that is associated with the phase windings and that, upon attainment of a specific winding temperature, reduces power by means of a resistance increase, or shuts the motor off. One of the phase windings has the PTC thermistor. The other phase windings or winding has a temperature monitor switch. The PTC thermistor and the temperature monitor switch or switches (TW1, TW2) are connected in series to a voltage source.

Abstract: A system and method for electrical power conversion, with the system being intended for use in converting a high voltage DC power output from a turbine generator to an AC power signal that is suitable for connecting to an AC power grid. The system utilizes a mechanical coupling between a synchronous motor driving a synchronous generator in order to provide isolation, as well as allowing for control of the real power output by the system.

Abstract: A switching control device is applied to a motor generator drive system equipped with a boost converter and an inverter. In order to avoid generation of a superimposed surge voltage, the switching control device corrects a switching timing tsw of the booster converter so that a switching timing of the booster converter is not overlapped with a switching timing of the inverter. A booster converter switching correction means corrects the switching timing tsw of the correction target to bring forward and before a start timing tpa of the switching inhibition period Pp. This makes it possible to suppress fluctuation in output of a load due to deterioration in controllability of the electric power converter, for example, suppress fluctuation in output torque of a motor generator.

Abstract: A sensorless motor controller includes a variable link control, including a radiation-hardened field programmable gate array (FPGA) and a back electromotive force (EMF) decoder circuit. The back EMF decoder infers the position of a rotor of the motor. A filter on the decoder conditions the back EMF signal and has multiple cutoff frequencies which can be dynamically controlled by the FPGA in order to compensate for phase shift in the back EMF signal. The FPGA also controls a variable DC link and its digital speed control loop.

Abstract: A system including an electric motor and a control software operable to control the operation of a plurality of different types of electric motors. The control software is provided with or identifies a particular control algorithm from among a plurality of such algorithms and/or a particular set of operational parameters from among a plurality of such sets for the motor with which it is assembled. The sets of operational parameters are stored in one or more read-only memories, which may be electrically erasable programmable read-only memories. To identify the particular motor control algorithm and/or the particular set of operational parameters, the control software causes the motor to be energized, senses an actual operating parameter of the motor, and identifies the particular motor control algorithm and/or the particular set of operational parameters based on the sensed actual operating parameter.

Abstract: A motor drive device (2) of the present invention includes a command response setting unit (22), a position and speed controller (23), a load characteristic compensator (24), a servo adjuster (6), a command response setting function (221), a stiffness setting function (231), an evaluation indicator measuring function (27), and a storage (28). The servo adjuster (6) stores a plurality of command response indicators (61) and a plurality of stiffness indicators (62). The servo adjuster (6) also generates an evaluation indicator measuring pattern (63) by a combination of each command response indicator (61) and each stiffness indicator (62). A motor (3) is driven in accordance with the generated evaluation indicator measuring pattern (63) while the command response indicators (61) and the stiffness indicators (62) are sequentially changed.

Abstract: Motor drive device (30) according to the present invention includes operation pattern generator (1), position and speed controller (23), load characteristic compensator (24), and load characteristic measurement unit (7). Operation pattern generator (1) increases an absolute value of acceleration, at which a motor speed or a motor position is changed, in each operation pattern. Load characteristic measurement unit (7) measures the load characteristic to set load characteristic compensator (24) when torque command indicator is less than or equal to a torque limit value. Load characteristic measurement unit (7) ends the measurement of the load characteristic without setting load characteristic compensator (24) when the torque command indicator is greater than the torque limit value.

Abstract: A system and method for suppressing a subtransient current and an overvoltage in a power system. A subtransient current is identified at a location in the power system. The subtransient current at the location in the power system is directed to ground for a time delay in response to identifying the subtransient current at the location in the power system. Directing the subtransient current at the location in the power system to ground is ceased in response to identifying an end of the time delay. An overvoltage is identified at the location in the power system. The overvoltage at the location in the power system is suppressed in response to identifying the overvoltage at the location in the power system.

Abstract: According to an embodiment, single phase motor drive circuit includes a counter unit, an energization pattern generation unit, and a drive unit. The unit counts a time of phase switching of a Hall signal based on a clock signal. The energization pattern generation unit generates an energization pattern based on the count result of the counter unit. The drive unit generates a pulse width modulation (PWM) signal based on a duty setting signal and the energization pattern signal to output an output signal to drive a single phase motor based on the PWM signal.

Abstract: An electrical drive system includes an electric motor having an armature, which is mounted on a stator, and a rotor, wherein aligning stator flux with rotor flux enables current to flow in the armature without inducing torque on the rotor shaft. The disclosed operation may be used, for example, in testing the electrical drive system. The electric drive system can carry full rated current yet produce little or no torque, thereby increasing the current that can be tested during electrical drive test procedures without producing undesired forces or motion. The method may be used, for example, in heating the electric motor, for example for de-icing.

Abstract: A motor controller is configured to judge whether or not the amount of displacement of a driven body after the direction of movement of the driven body is reversed, exceeds a predetermined threshold value, and whether or not the amount of displacement of a motor after the direction of movement of the motor is reversed, exceeds another predetermined threshold value. When the amount of displacement of the driven body exceeds the threshold value, or the amount of displacement of the motor exceeds a second threshold value, the correction of the commands to the motor is terminated.

Abstract: An apparatus for a quasi variable frequency motor controller is includes a DFC module that applies a first frequency to a motor as part of a discrete frequency control (“DFC”) method for motor starting. The first frequency includes a discrete frequency in a plurality of discrete frequencies of the DFC method and each discrete frequency includes a frequency lower than a fundamental frequency of an alternating current (“AC”) voltage source providing power to the motor. The apparatus includes a torque module that determines when motor torque generated by the motor reaches a negative torque threshold and a next frequency module that applies a second frequency to the motor in response to the torque module determining that the motor torque has reached the negative torque threshold. The second frequency is a next frequency in the DFC method.

Abstract: A motor control system includes a motor having an associated rotary position encoder, and a controller for controlling the operation of the motor, wherein the motor is switchable between a position control mode and a torque control mode.

Abstract: The present invention proposes a thrust ripple mapping system in a precision stage with the thrust ripple mapping system comprising a moving stage, a load cell, a plurality of motors and a processing component. The load cell is coupled to the moving stage. The motors are employed in moving the load cell and the moving stage. The processing component takes a thrust force measurement at each of a plurality of moving increments of the load cell.

Abstract: The present invention provides a driving circuit for a vibration motor and a driving method for the vibration motor. The driving circuit comprises: a detecting unit, coupled to the vibration motor, for detecting rotating position and rotating speed of the vibration motor and accordingly generating a detecting result; and a control unit, coupled to the detecting unit and the vibration motor, for controlling acceleration and deceleration of the vibration motor according to the detecting result. The driving method comprises: providing a detecting unit for detecting rotating position and rotating speed of the vibration motor and accordingly generating a detecting result; and providing a control unit for controlling acceleration and deceleration of the vibration motor according to the detecting result.

Abstract: 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.

Abstract: Disclosed herein are sinusoidal modulation control methods and circuits for PMSM. In one embodiment, a method can include: detecting rotor position information of the PMSM to obtain a rotor position signal and a rotor rotating speed measured value; comparing the rotating speed measured value against a reference rotating speed value to generate an error signal, and generating a first regulating voltage signal based on the error signal using a PI regulator; receiving the rotor position signal and the first regulating voltage signal, and generating a full-wave U-shaped modulation wave by using the rotor position signal as a time reference; generating a second U-shaped modulation wave by multiplying the full-wave U-shaped modulation wave with the first regulating voltage signal; comparing the second U-shaped modulation wave against a triangular wave to generate a PWM control signal that controls a switch of an inverter to regulate a current of the PMSM.

Abstract: A method for controlling an ECM motor to output a constant torque. The method includes: 1) entering a target torque value T0 from an external device; when the motor is in a non-use state, starting the motor, and allowing the microprocessor to acquire an original output voltage value P chopped by a PWM signal; when the motor is in a running state, allowing the microprocessor to acquire a current output voltage value P chopped by the PWM signal; 2) enabling the microprocessor to calculate a target bus current value Itad using the function Itad=F(T,P) according to the target torque value T0 and the output voltage value P chopped by the PWM signal; and detecting a real-time bus current Ibus; and 3) allowing the microprocessor to compare the target bus current value Itad with the real-time bus current Ibus for conducting a closed-loop control.

Abstract: A rotation driving system and a method to determine the presence of a rotator on a turntable are provided. The rotation driving system includes an encoder to detect rotation information of a motor, and a controller to determine whether or not a rotator is present on a turntable and also, to adjust a gain of the motor according to moment of inertia of the rotator.