The invention relates to a method for operating a motor vehicle (1) which has an electrical machine (7) with at least three phases, an electrical energy store (13) and a power electronics system (12) having a plurality of switching elements, wherein the switching elements of the power electronics system (12) are actuated for electrically connecting the phases to the energy store (13), in order to produce a generator deceleration moment. Provision is made for a driving situation of the motor vehicle (1) to be determined, wherein an actuation method is selected from amongst a group of at least two possible actuation methods according to the determined driving situation, and wherein the switching elements are actuated according to the selected actuation method.

Described is a vector control system for a vapor compression circuit. The vector control system may monitor the vapor compression circuit and adjust the speed of one or more motors to increase efficiency by taking into account the torque forces placed on a compressor motor.

A controller for a motor system includes an input terminal to receive a signal indicating a speed of an electric motor and a regenerative brake current interpolator to indicate a brake current to be applied to the electric motor responsive to the speed of the electric motor. Values of the brake current vary with variation of the speed of the electric motor.

A controller for a motor system includes an input terminal to receive a signal indicating a speed of an electric motor and a regenerative brake current interpolator to indicate a brake current to be applied to the electric motor responsive to the speed of the electric motor. Values of the brake current vary with variation of the speed of the electric motor.

A method for controlling torque applied during a screw driving operation using a screw driving device. The device includes: an electric motor provided with a rotor; an output member capable of being rotated; and a rebounding impact mechanism rigidly connected to the rotor and to the output member. The method includes power supplying the motor inducing driving the impact mechanism by the rotor and periodically rotating the output member by the impact mechanism; driving the impact mechanism generating a plurality of successive impacts at the end of each of which the rotor rotates in a rebound in the opposite direction to the screw driving operation; determining a maximum rotational frequency reached by the rotor during the rebound following each of the impacts; and stopping the screw driving operation when the maximum rotational frequency reaches a predetermined threshold corresponding to a predetermined torque level.

A method for controlling torque applied during a screw driving operation using a screw driving device. The device includes: an electric motor provided with a rotor; an output member capable of being rotated; and a rebounding impact mechanism rigidly connected to the rotor and to the output member. The method includes power supplying the motor inducing driving the impact mechanism by the rotor and periodically rotating the output member by the impact mechanism; driving the impact mechanism generating a plurality of successive impacts at the end of each of which the rotor rotates in a rebound in the opposite direction to the screw driving operation; determining a maximum rotational frequency reached by the rotor during the rebound following each of the impacts; and stopping the screw driving operation when the maximum rotational frequency reaches a predetermined threshold corresponding to a predetermined torque level.

For polyharmonic flux motor loss increase, a method offsets pulse width modulation (PWM) carriers to a motor to increase motor harmonics. The offset PWM carriers increase energy losses for the motor.

A motor control system for controlling a brushless electric motor of a power operated actuator of a closure panel of a vehicle and method of operating the control system are provided. The control system includes a vector control system configured to receive a torque current based on a measured angular velocity of the motor and current of each of the phases and determine corresponding stationary reference frame voltages. The vector control system outputs pulse width modulation signals to the motor. A vector torque current limiter couples to the vector control system and the motor and is configured to determine the torque current drawn, receive the measured angular velocity and determine whether there is a reduction of the measured angular velocity and detects a pinch event and reduces the torque current in response to determining there is a reduction of the measured angular velocity of the brushless electric motor.

A motor control system for controlling a brushless electric motor of a power operated actuator of a closure panel of a vehicle and method of operating the control system are provided. The control system includes a vector control system configured to receive a torque current based on a measured angular velocity of the motor and current of each of the phases and determine corresponding stationary reference frame voltages. The vector control system outputs pulse width modulation signals to the motor. A vector torque current limiter couples to the vector control system and the motor and is configured to determine the torque current drawn, receive the measured angular velocity and determine whether there is a reduction of the measured angular velocity and detects a pinch event and reduces the torque current in response to determining there is a reduction of the measured angular velocity of the brushless electric motor.

An actuator in a HVAC system includes a motor and a drive device driven by the motor. The drive device is coupled to a movable HVAC component for driving the movable HVAC component between multiple positions. The actuator includes an input connection configured to receive an input signal and a processing circuit coupled to the motor. The processing circuit is configured to determine whether the input signal is an AC voltage signal or a DC voltage signal. The processing circuit is configured to operate the motor using an AC motor control technique in response to determining that the input signal is an AC voltage signal and configured to operate the motor using a DC motor control technique in response to determining that the input signal is a DC voltage signal.