Technical solutions are described for controlling operation of a motor using a controller to: energize the motor to rotate driveshaft and a worm; drive a worm gear by the worm; stop the motor from rotating the driveshaft in response to the worm gear rotating to a given one of a plurality of first stop positions; and change the given one of the first stop positions to another one of the first stop positions. A method for controlling a machine comprises: rotating a driveshaft by a motor; driving a worm gear by a worm to cause the worm gear to rotate; stopping the motor from rotating the driveshaft in response to the worm gear rotating to a given one of a plurality of first stop positions; and changing the given one of the first stop positions to another one of the first stop positions.

In an electric vehicle including a motor for traveling, when an accelerator is switched from an on-state to an off-state, the motor is controlled such that a vehicle torque is varied more gradually toward a requested torque on a brake side (requested torque in the off-state) in turning than in traveling straight. Thereby, when the accelerator is switched from the on-state to the off-state in turning, drivability of the driver can be restrained from deteriorating.

The application provides a highly energy efficient circuit for an AC ceiling fan motor in high speed gear, which comprises a speed regulator and a ceiling fan motor whose output torque at full voltage exceeds a required torque at rated load, wherein two ends of a winding of the ceiling fan motor are connected to a voltage-regulating capacitor bank and a zero line, respectively, the voltage-regulating capacitor bank comprises a first capacitor bank for enabling low speed operation of the ceiling fan motor by stepping down by a capacitor C3, a second capacitor bank for enabling medium speed operation of the ceiling fan motor by stepping down by a capacitor C2 and the capacitor C3 in parallel, and a third capacitor bank for enabling high speed operation of the ceiling fan motor by stepping down by a capacitor C1, the capacitor C2 and the capacitor C3 in parallel to improve energy efficiency to enable the ceiling fan motor to operate efficiently, the speed regulator comprises a shift switch whose input end is connected to a live wire, the speed regulator adjusts the voltage of the ceiling fan motor by switching to the first capacitor bank, the second capacitor bank or the third capacitor bank through the shift switch. The present application improves the working efficiency and performance of the ceiling fan motor, reduces the energy consumption required for the operation of the ceiling fan motor, which follows the trend of energy conservation and emission reduction, and is suitable for promotion and application.

A shift range control apparatus acquires a motor rotation angle signal corresponding to a rotation position of a motor, calculates a motor angle based on a motor rotation angle signal, acquires an output shaft signal corresponding to the rotation position of an output shaft, sets a target rotation angle based on a target shift range and the output shaft signal, drives the motor to cause the motor angle to reach the target rotation angle, determines the shift range based on the output shaft signal, monitors a fault in the output shaft signal, and learns a P-side reference position corresponding to the motor angle in a situation where the engagement member abuts against a first wall portion of the shift range switching mechanism, in a condition that the fault occurs in the output shaft signal.

A shift range control device switches a shift range by controlling the driving of a motor. An angle calculation unit acquires a motor rotation angle signal outputted from a motor rotation angle sensor that detects the rotation position of the motor, and calculates a motor angle. A signal acquisition unit acquires an output shaft signal, which is outputted from an output shaft sensor for detecting the rotation position of an output shaft through which the rotation of the motor is transmitted. A value of the output shaft signal changing in steps in accordance with the rotation position of the output shaft. A target setting unit sets a motor angle target value by correcting, in accordance with a speed of the motor at the timing at which the acquired output shaft signal changes, a pre-correction motor angle target value that is set on the basis of a target shift range and a change point at which the output shaft signal changes. A drive control unit controls driving of the motor so that the motor angle reaches the motor angle target value.

In an electric vehicle including a motor for traveling, when an accelerator is switched from an on-state to an off-state, the motor is controlled such that a vehicle torque is varied more gradually toward a requested torque on a brake side (requested torque in the off-state) in turning than in traveling straight. Thereby, when the accelerator is switched from the on-state to the off-state in turning, drivability of the driver can be restrained from deteriorating.

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.

A shift range control device switches a shift range by controlling driving of a motor. A learning unit learns, as a position correction value, a normal state time correction value calculated based on at least one of a first reference angle and a second reference angle when at least one output shaft signal is available at a time of turning on of a start switch. The first reference angle is a motor angle at timing when the output shaft signal changes in response to the rotation of the motor in a first direction. The second reference angle is the motor angle at timing when the output shaft signal changes in response to the rotation of the motor in a second direction opposite to the first direction. A target setting unit sets a motor angle target value by using the normal state time correction value stored in a storage unit during a period from when all the output shaft signals are determined to be unavailable to when the start switch is turned off.

A shift range control device switches a shift range by controlling the driving of a motor. An angle calculation unit acquires a motor rotation angle signal outputted from a motor rotation angle sensor that detects the rotation position of the motor, and calculates a motor angle. A signal acquisition unit acquires an output shaft signal, which is outputted from an output shaft sensor for detecting the rotation position of an output shaft through which the rotation of the motor is transmitted. A value of the output shaft signal changing in steps in accordance with the rotation position of the output shaft. A target setting unit sets a motor angle target value by correcting, in accordance with a speed of the motor at the timing at which the acquired output shaft signal changes, a pre-correction motor angle target value that is set on the basis of a target shift range and a change point at which the output shaft signal changes. A drive control unit controls driving of the motor so that the motor angle reaches the motor angle target value.

A shift range control apparatus controls driving of a motor in a shift range switching system provided with the motor and a shift range switching mechanism. A drive controller controls the driving of the motor to fit an engaging member in a recess according to a shift range in response to that the shift range is switched. A polarity determination device determines a polarity of a stator, which faces a rotor. The drive controller causes the engaging member to move to the recess according to the shift range, and then performs cancel energization control to energize a coil with a cancellation current which is a current reducing the magnetic flux density of the stator according to the polarity of the stator.