A method for controlling switched reluctance machine (SRM) utilizing a SRM control system. The method allows for adaptive pulse positioning over a wide range of speeds and loads. An initial rotor position is provided for the SRM utilizing an initialization mechanism. A pinned point on a phase current waveform is defined during an initial current rise phase of the current waveform. A slope of the current rise is determined as the current waveform reaches the pinned point. The slope is then fed to the commutation module of the SRM control system. An error signal from calculated inductance or current slope is used as an input to a control loop in the SRM control system. The time determining module determines an optimum time signal to fire a next pulse. The optimum time signal is fed to the SRM for turning the plurality of SRM switches to on and off states.

A control device that controls an inverter interposed between a DC power source and an AC rotary electric machine to perform power conversion between DC power and AC power, wherein the inverter includes a plurality of sets of an upper switching element and a lower switching element connected in series with each other between positive and negative electrodes on the DC side and controlled so as to be turned on and off in a complementary manner; and the control device executes short-circuiting processing, in which all the upper switching elements or all the lower switching elements are controlled so as to be turned on, while the AC rotary electric machine is stationary.

A control device that controls an inverter interposed between a DC power source and an AC rotary electric machine to perform power conversion between DC power and AC power, wherein the inverter includes a plurality of sets of an upper switching element and a lower switching element connected in series with each other between positive and negative electrodes on the DC side and controlled so as to be turned on and off in a complementary manner; and the control device executes short-circuiting processing, in which all the upper switching elements or all the lower switching elements are controlled so as to be turned on, while the AC rotary electric machine is stationary.

An inverter control method for a hybrid vehicle includes: monitoring a torque command and a motor speed of the vehicle in real-time; determining whether the motor speed is less than a first speed; determining whether an absolute value of the torque command is less than a first torque when the motor speed is less than the first speed; changing a switching frequency to a predetermined frequency when the absolute value of the torque command is less than the first torque; and controlling an inverter operation by generating a pulse-width modulation (PWM) signal with the switching frequency changed to the predetermined frequency.

A control apparatus controls a rotating machine including a stator having groups of phase windings, to control current application to the groups. The control apparatus includes power converters converting received power to AC power and supplying the AC power to the rotating machine, a harmonic component cancellation section reducing a harmonic component superimposed on a fundamental wave component by a cancellation process in an estimated-rotating coordinate system for at least one of voltage and current of each system, when a unit of a group of components controlling current application to a specific group of the windings is defined as a system, an induced voltage estimation section estimating an induced voltage based on information common to the systems including a voltage value and a current value calculated by the cancellation process, and a magnetic-pole-position estimation section estimating a magnetic pole position of a rotor based on the estimated induced voltage.

A control apparatus controls a rotating machine including a stator having groups of phase windings, to control current application to the groups. The control apparatus includes power converters converting received power to AC power and supplying the AC power to the rotating machine, a harmonic component cancellation section reducing a harmonic component superimposed on a fundamental wave component by a cancellation process in an estimated-rotating coordinate system for at least one of voltage and current of each system, when a unit of a group of components controlling current application to a specific group of the windings is defined as a system, an induced voltage estimation section estimating an induced voltage based on information common to the systems including a voltage value and a current value calculated by the cancellation process, and a magnetic-pole-position estimation section estimating a magnetic pole position of a rotor based on the estimated induced voltage.

Disclosed examples include motor drive power conversion systems with an inverter, as well as a controller methods to drive a motor in which output filter capacitor currents are computed and used to compensate the motor control in consideration of damping resistance values of an output filter.

Disclosed examples include motor drive power conversion systems with an inverter, as well as a controller methods to drive a motor in which output filter capacitor currents are computed and used to compensate the motor control in consideration of damping resistance values of an output filter.

The present invention relates to a motor drive apparatus and, more particularly, to a motor drive apparatus capable of immediately restarting by maintaining sensorless control during a stop operation of a motor. The motor drive apparatus comprises: an inverter for driving a motor by using an AC voltage; and a control unit for controlling operations of a switching element included in the inverter. At this time, when a stop command is input, the control unit decreases a duty ratio of a PWM signal until a present speed of the motor becomes smaller than a predetermined minimum speed, thereby decreasing the revolutions per minute of the motor. Then, when a restart command is input in a state where the duty ratio of the PWM signal is decreased, the control unit can immediately restart the motor by increasing the duty ratio of the PWM signal.

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.