The present invention provides a stage driving apparatus for driving a stage, comprising: a linear motor including a stator which includes a coil array obtained by alternately arraying first phase coils and second phase coils, and a movable element placed on the stage; and a control unit configured to control the linear motor by controlling an energization state of the coil array, wherein in a stopping period during which the stage is stopped in a predetermined position, the control unit holds a position of the stage in the predetermined position by turning on the first phase coil among the coil array, and generates heat by turning on the second phase coil arranged in a position where no thrust is given to the movable element among the coil array.

Provided is a method for heating a generator of a wind power installation during or before starting the installation. The generator is a permanent magnet synchronous generator configured to generate a stator current comprising at least one three-phase current. The installation is configured as a gearless installation and is connected to an electrical supply network for feeding electrical power into the network. The installation comprises a converter, connected to the generator, to control the generator to feed electrical power into the network. The method comprises rotating the rotor with a low rotational speed below a first limit and operating the converter such that the generator generates the stator current and electrical power, and no electrical power is fed into the electrical supply network. At least one portion of the stator current substantially circulates through the generator and the converter to consume power in generator windings to heat the generator.

A vehicle includes an electric machine, a battery, an inverter, and a controller. The controller switches the inverter at a switching frequency selected to generate an AC current to heat the battery, adjusts a d-axis current of the electric machine to increase a battery heating power, and adjusts a q-axis current of the electric machine according to the adjusted d-axis current.

A heating apparatus includes: a motor control unit, having an inverter and a controller that are connected to each other; an electric heater; and a motor, having three-phase windings, where ends of the three-phase windings are connected to the inverter, the other ends of the three-phase windings are connected to a connection point, and the connection point is connected to the electric heater. Therefore, the electric heater can be controlled by using the motor control unit that controls the motor, without a need to independently dispose a control circuit for controlling the electric heater, so that a quantity of controllers, a weight of the heating apparatus, a required occupation space of the heating apparatus, and costs of the heating apparatus can be reduced.

The present application provides a battery thermal management system, a control method and device of a battery heating system, a device, and a medium. The method includes: acquiring a temperature rise rate parameter of the battery; determining proportions of a square wave signal and a sine wave signal in a first control signal of the switch components according to the temperature rise rate parameter; generating the first control signal of the switch components according to the proportions of the square wave signal and the sine wave signal; outputting the first control signal to the switch components to control switching on or off of the switch components via the first control signal, so as to generate an alternating current in a loop connecting the battery and the motor and heat the battery using the alternating current.

A drive device including: a motor; a transmission device including a reduction gear; a housing; an electric oil pump; and a control unit including a motor control unit and an electric oil pump control unit. The electric oil pump control unit includes: control mode switching means that, in oil supply processing, switches between and executes a normal control mode in which the output of the electric oil pump is changed in a plurality of stages according to the temperature of the stator or the rotor, and a startup mode in which the electric oil pump is operated at a maximum output in the normal control mode for a predetermined time at the start of power supply; and pump driving means that operates the electric oil pump.

A motor controller includes a temperature sensor configured to detect a temperature of a motor. An intermittent operation circuit allows the motor to intermittently operate at a rotation speed up to a phase before the motor reaches a rated rotation speed when it is detected that the motor temperature is at a low temperature range. The intermittent operation circuit includes a position fixing circuit configured to allow a constant electric current to flow through stator coils and to fix the motor in a stopped state. The intermittent operation circuit further includes a forced commutation circuit that allows the motor to rotate at a rotation speed up to the start-up rotation. The position fixing circuit allows the constant electric current to have a greater value as the temperature detected by the temperature sensor is lower, and allows the position fixing circuit and the forced commutation circuit to operate alternately.

Systems and methods for providing electric energy to an electrically heated catalyst are described. In one example, the electrically heated catalyst may be a three phase device with heating elements that are arranged in a delta configuration. In other examples, the electrically heated catalyst may include a single heating element.

The present application provides a battery thermal management system, a control method and device of a battery heating system, a device, and a medium. The method includes: acquiring a temperature rise rate parameter of the battery; determining proportions of a square wave signal and a sine wave signal in a first control signal of the switch components according to the temperature rise rate parameter; generating the first control signal of the switch components according to the proportions of the square wave signal and the sine wave signal; outputting the first control signal to the switch components to control switching on or off of the switch components via the first control signal, so as to generate an alternating current in a loop connecting the battery and the motor and heat the battery using the alternating current.

The motor-driven compressor includes an electric motor, a housing, a compression portion, and an inverter device. The inverter device includes an inverter circuit, a current sensor, a coordinate converter, a speed controller, a current controller, a PWM controller, and a rotation angle estimator. The speed controller generates a d-axis current command value and a q-axis current command value such that a necessary torque to drive the electric motor occurs. The inverter device includes a heat-generating current command section that increases a temperature of the electric motor by changing the d-axis current command value and the q-axis current command value. The heat-generating current command section changes the d-axis current command value and the q-axis current command value so as to shift them in a direction in which a d-axis current value increases along a constant torque curve in a d-q coordinate system.