This invention is concerning obtaining a control apparatus and a control method for an AC rotary machine, with which a voltage command can be used up to a saturation voltage in each group of windings even when dimension differences exist between the groups of windings. A voltage saturation determination unit determines whether or not voltage saturation has occurred in a first winding group or a second winding group on the basis of at least one of a voltage and a current relating to the first winding group and the second winding group, and when determination is made that voltage saturation has occurred in either the first winding group or the second winding group, generates a voltage saturation determination signal for reducing a gain of at least one axial direction component on a rotational two-axis coordinate system.

A control system for an electric machine, wherein the electric machine has a maximum bus value (V.sub.bus) is provided. The control system is configured to determine a feedforward vector (V.sub.FF), determine a feedback vector (V.sub.FB), compare a magnitude of a sum of the feedforward vector and feedback vector (|V.sub.FF+V.sub.FB|) and the maximum bus value (V.sub.bus), when |V.sub.FF+V.sub.FB|V.sub.bus providing a control vector of V.sub.FF+V.sub.FB to the electric machine, and when |V.sub.FF+V.sub.FB|>V.sub.bus providing a control vector of V.sub.FF+k(V.sub.FB) to the electric machine, where k is a scalar value between 0 and 1 inclusive where |V.sub.FF+k(V.sub.FB)|=V.sub.bus.

A control system for an electric machine, wherein the electric machine has a maximum bus value (V.sub.bus) is provided. The control system is configured to determine a feedforward vector (V.sub.FF), determine a feedback vector (V.sub.FB), compare a magnitude of a sum of the feedforward vector and feedback vector (|V.sub.FF+V.sub.FB|) and the maximum bus value (V.sub.bus), when |V.sub.FF+V.sub.FB|V.sub.bus providing a control vector of V.sub.FF+V.sub.FB to the electric machine, and when |V.sub.FF+V.sub.FB|>V.sub.bus providing a control vector of V.sub.FF+k(V.sub.FB) to the electric machine, where k is a scalar value between 0 and 1 inclusive where |V.sub.FF+k(V.sub.FB)|=V.sub.bus.

An power system for an electric motor vehicle includes a power electronics unit connected to battery-side terminals, motor-side terminals and power source-side terminals. The power electronics unit including a plurality of half-bridges, each of the half-bridges including a pair of switches, each of the half-bridges connecting to a respective one of the motor-side terminals, the power electronics unit being operable to direct current from a power source through an electric motor to a battery to charge the battery by repeatedly operating the electric motor in an inductor field building phase, and then an inductor field collapse phase. The power electronics unit is operable to supply current from the power source to electric motor to establish inductor fields in the electric motor in the inductor field building phase. The power electronics unit is operable to supply current from the electric motor to the battery upon a collapse of the established inductor fields in the electric motor in the inductor field collapse phase. At least one of the half-bridges of the power electronics unit includes or is directly connected to the first power source-side terminal.

An power system for an electric motor vehicle includes a power electronics unit connected to battery-side terminals, motor-side terminals and power source-side terminals. The power electronics unit including a plurality of half-bridges, each of the half-bridges including a pair of switches, each of the half-bridges connecting to a respective one of the motor-side terminals, the power electronics unit being operable to direct current from a power source through an electric motor to a battery to charge the battery by repeatedly operating the electric motor in an inductor field building phase, and then an inductor field collapse phase. The power electronics unit is operable to supply current from the power source to electric motor to establish inductor fields in the electric motor in the inductor field building phase. The power electronics unit is operable to supply current from the electric motor to the battery upon a collapse of the established inductor fields in the electric motor in the inductor field collapse phase. At least one of the half-bridges of the power electronics unit includes or is directly connected to the first power source-side terminal.

A power tool including a housing, a brushless motor, one or more position sensors, a power switching circuit, and an electronic controller. The one or more position sensors are configured to generate output signals corresponding to a rotational position of the brushless motor. The power switching circuit is configured to provide a supply of power from a power source to the brushless motor. The electronic controller is configured to implement field-oriented control (FOC) of the brushless motor. The electronic controller configured to receive the output signals from the one or more position sensors, determine a parameter of the brushless motor based on the output signals, determine drive parameters for the brushless motor based on the parameter of the brushless motor using FOC, generate drive commands based on the drive parameters, and drive the brushless motor based on the drive commands.

A power tool including a housing, a brushless motor, one or more position sensors, a power switching circuit, and an electronic controller. The one or more position sensors are configured to generate output signals corresponding to a rotational position of the brushless motor. The power switching circuit is configured to provide a supply of power from a power source to the brushless motor. The electronic controller is configured to implement field-oriented control (FOC) of the brushless motor. The electronic controller configured to receive the output signals from the one or more position sensors, determine a parameter of the brushless motor based on the output signals, determine drive parameters for the brushless motor based on the parameter of the brushless motor using FOC, generate drive commands based on the drive parameters, and drive the brushless motor based on the drive commands.

This invention is concerning obtaining a control apparatus and a control method for an AC rotary machine, with which a voltage command can be used up to a saturation voltage in each group of windings even when dimension differences exist between the groups of windings. A voltage saturation determination unit determines whether or not voltage saturation has occurred in a first winding group or a second winding group on the basis of at least one of a voltage and a current relating to the first winding group and the second winding group, and when determination is made that voltage saturation has occurred in either the first winding group or the second winding group, generates a voltage saturation determination signal for reducing a gain of at least one axial direction component on a rotational two-axis coordinate system.

A stepping motor driver which drives a stepping motor according to a position angle command includes: a current detector that detects a phase current; an inverter that applies a current to a winding; and a control unit that controls the inverter. The control unit includes: a phase current coordinate transformer that transforms the phase current to generate a dp-axis detection current and a qp-axis detection current; a torque correction command generator that generates a torque correction command according to a torque correction waveform for suppression of torque fluctuation; a torque correction command coordinate transformer that transforms the torque correction command into a dp-axis component and a qp-axis component to generate a dp-axis torque correction component and a qp-axis torque correction component; an adder that superposes the dp-axis torque correction component and the qp-axis torque correction component respectively on a dp-axis fundamental current command and a qp-axis fundamental current command to generate a dp-axis current command and a qp-axis current command; and a control command generator that compares the dp-axis detection current and the qp-axis detection current respectively with the dp-axis current command and the qp-axis current command and applies a control command to the inverter.

Electric motor controller and related methods. One example is method of controlling an electric motor, the method comprising: calculating, by a motor controller, setpoint Q-D signals based on a setpoint speed signal, the setpoint Q-D signals represent setpoint position of a magnetic field relative to a rotor of the electric motor; serially sending, by the motor controller, the setpoint Q-D signals to a field-oriented controller disposed within a distinct packaging from the motor controller; converting, by the field-oriented controller, the setpoint Q-D signals to setpoint - signals that represent setpoint position of the magnetic field relative to A stator of the electric motor; transforming, by the field-oriented controller, the setpoint - signals into setpoint voltage signals; and gating, by the field-oriented controller, an inverter based on the setpoint voltage signals.