A method is provided for electrically driving a motor having a plurality of phase windings such that EMC (electromagnetic compatibility) is improved and the running performance of the motor is simultaneously kept constant. At least one of the phase windings is not supplied with a current pulse during a complete revolution of the rotor, or at least one switchable electrical resistor is switched on, for at least one subsequent commutation phase by means of an electrical switching element, if the detected rotor speed is greater than the specified target speed.

An opening and closing body control apparatus for a vehicle includes an assist control portion configured to detect an operation of an opening and closing body of the vehicle by an operator or a user and control voltage applied to a motor serving as a drive source which applies a drive force to the opening and closing body during the operation of the opening and closing body by the operator or the user. The assist control portion applies an assist voltage and an offset voltage alternately to the motor to operate an assist control for applying the drive force to the opening and closing body. The assist voltage for rotating the motor at a rotation speed which corresponds to an operation speed of the opening and closing body and the offset voltage being lower than the assist voltage.

A method for starting a synchronous motor is provided. The synchronous motor includes a rotor for creating a first magnetic field and a stator with stator windings connected to an electrical energy converter for converting a supply voltage into a stator voltage to be applied to the stator windings to create a rotating second magnetic field interacting with the first magnetic field. The method includes applying reference stator voltages to the stator windings, where the reference stator voltages are determined from a reference current vector and a reference rotor speed, measuring stator currents, calculating an estimated rotor speed and rotor position from the applied stator voltages and the measured stator currents, calculating a speed error by subtracting the estimated rotor speed from the reference rotor speed, determining a reference torque producing current component from the speed error, and modifying the reference current vector with the reference torque producing current component.

A method for starting a synchronous motor is provided. The synchronous motor includes a rotor for creating a first magnetic field and a stator with stator windings connected to an electrical energy converter for converting a supply voltage into a stator voltage to be applied to the stator windings to create a rotating second magnetic field interacting with the first magnetic field. The method includes applying reference stator voltages to the stator windings, where the reference stator voltages are determined from a reference current vector and a reference rotor speed, measuring stator currents, calculating an estimated rotor speed and rotor position from the applied stator voltages and the measured stator currents, calculating a speed error by subtracting the estimated rotor speed from the reference rotor speed, determining a reference torque producing current component from the speed error, and modifying the reference current vector with the reference torque producing current component.

A linear motor system includes: a stator including first to tenth coils; a mover including a permanent magnet; a switcher that switches one or more power supply target coils; and first to tenth amplifiers provided in one-to-one correspondence with first to tenth coils. One or more amplifiers that serve as new one or more power supply target amplifiers immediately after the switching calculate Δθ (t0), which is a position deviation at time t=t0, based on Δθ (t0)=Δθ (t0−td)+A−B, where A is a difference between an instructed position at time t=t0 and an instructed position at time t=t0−td, and B is a difference between an actual position at time t=t0 and an actual position at time t=t0−td, and supply power to the power supply target coils by the position deviation Aθ (t0).

A system includes a reference speed module and a motor control module. The reference speed module is configured to determine a reference speed range based on a speed of a left wheel of a pair of front or rear wheels of a vehicle and a speed of a right wheel of the pair of front or rear wheels. The right wheel is disconnected from the left wheel. The motor control module is configured to control at least one of a first electric motor and a second electric motor based on the reference speed range. The first electric motor is connected to the left wheel. The second electric motor is connected to the right wheel.

A system includes a reference speed module and a motor control module. The reference speed module is configured to determine a reference speed range based on a speed of a left wheel of a pair of front or rear wheels of a vehicle and a speed of a right wheel of the pair of front or rear wheels. The right wheel is disconnected from the left wheel. The motor control module is configured to control at least one of a first electric motor and a second electric motor based on the reference speed range. The first electric motor is connected to the left wheel. The second electric motor is connected to the right wheel.

A motor drive apparatus includes: a dq-axis current controller converting phase current flowing through a synchronous motor into d-axis current and q-axis current, and controlling the phase current by determining a voltage command based on the d-axis current and a d-axis current command as well as the q-axis current and a q-axis current command; a voltage amplitude calculating unit obtaining voltage amplitude; a speed controller controlling rotational speed of the motor by determining the q-axis current command based on a speed command, the rotational speed, and a speed droop amount that reduces the speed command; a flux weakening controller performing flux control to limit amplitude of voltage output to the motor by determining the d-axis current command based on the voltage amplitude and a first voltage limit value; and a speed droop controller controlling the speed droop amount based on the voltage amplitude and a second voltage limit value.

A motor drive apparatus that can continue operation within the upper limit of system control even if a voltage drop of an AC power source occurs during operation of a motor used for a hoist or a crane is provided. The inverter control unit of the motor drive apparatus includes a speed reference setting means for setting the rotation speed of the motor, means for detecting a speed deviation between the output of the rotation speed detection means for detecting the rotation speed of the motor and the output of the speed reference setting means, means for controlling the output current of the inverter according to the output of the speed deviation. The speed reference setting means includes a correction circuit for correcting an external speed command given from outside. The correction circuit corrects the external speed command according to a deviation between a detection value of a DC voltage and a first reference value when a voltage drop signal is received from the voltage drop detection means, and makes the corrected speed command as the output of the speed reference setting means.

The disclosure relates to a control device and a corresponding method for operating an electromechanical brake booster of a brake system of a vehicle, comprising an electronics unit that defines a target variable with respect to a target rotational speed of a motor of the electromechanical brake booster, taking into account a brake input signal with respect to a braking request, and that sends at least one control signal to the motor. The electronics unit defines a maximum target variable with respect to a maximum target rotational speed of the motor, taking into account a current intensity of a motor current of the motor and a current angle of rotation of a rotor of the motor, and defines the target variable with respect to the target rotational speed of the motor of the electromechanical brake booster to be at the most equal to the defined maximum target variable.