An electric motor-driven parking brake of a motor vehicle can be released in an emergency by applying emergency current from a parallel emergency current source to the motors controlling the parking brake. The direction of the emergency current is selected to reverse the motors, i.e., release the parking brake.

An electric motor-driven parking brake of a motor vehicle can be released in an emergency by applying emergency current from a parallel emergency current source to the motors controlling the parking brake. The direction of the emergency current is selected to reverse the motors, i.e., release the parking brake.

A turning apparatus includes: an electric motor; a pinion gear that rotationally drives a wheel gear provided in a rotor in a first rotation direction and moves to a first position where the pinion gear can transmit a rotation of the electric motor to the wheel gear and a second position where the pinion gear cannot transmit the rotation of the electric motor to the wheel gear; a current value detection unit that detects a current value of the electric motor in a state where the pinion gear is positioned at the first position; and a control device that controls the electric motor to rotate the pinion gear in a second rotation direction opposite to the first rotation direction based on the current value detected by the current value detection unit.

A turning apparatus includes: an electric motor; a pinion gear that rotationally drives a wheel gear provided in a rotor in a first rotation direction and moves to a first position where the pinion gear can transmit a rotation of the electric motor to the wheel gear and a second position where the pinion gear cannot transmit the rotation of the electric motor to the wheel gear; a current value detection unit that detects a current value of the electric motor in a state where the pinion gear is positioned at the first position; and a control device that controls the electric motor to rotate the pinion gear in a second rotation direction opposite to the first rotation direction based on the current value detected by the current value detection unit.

Controllers for controlling hybrid motor drive circuits configured to drive a motor are provided herein. A controller is configured to drive the motor using an inverter when a motor commanded frequency is not within a predetermined range of line input power frequencies, and couple line input power to an output of the inverter using a first switch device when the motor commanded frequency is within the predetermined range of line input power frequencies.

Example motor assemblies for architectural coverings are described herein. An example motor assembly includes a motor, a first switch to trigger the motor to retract an architectural covering, a second switch to trigger the motor to extend the architectural covering, and an actuator positioned to activate the first switch when the actuator is rotated in a first direction and to activate the second switch when the actuator is rotated in a second direction. Also described herein are example lever actuators for motor assemblies of architectural coverings. An example lever actuator detaches from the motor assembly to prevent excess force on the motor assembly that could otherwise detrimentally affect the motor assembly.

Example motor assemblies for architectural coverings are described herein. An example motor assembly includes a motor, a first switch to trigger the motor to retract an architectural covering, a second switch to trigger the motor to extend the architectural covering, and an actuator positioned to activate the first switch when the actuator is rotated in a first direction and to activate the second switch when the actuator is rotated in a second direction. Also described herein are example lever actuators for motor assemblies of architectural coverings. An example lever actuator detaches from the motor assembly to prevent excess force on the motor assembly that could otherwise detrimentally affect the motor assembly.

An electronic device is provided. The electronic device includes a first housing, a second housing slidably coupled to the first housing, a flexible display configured to be expanded or contracted based on slide-out or slide-in movement of the second housing, a drive motor disposed in the second housing and including a pinion gear, a rack gear structure disposed in the first housing and including a rack gear engaged with the pinion gear, at least one sensor module configured to detect movement of the second housing, a memory configured to store executable instructions, and at least one processor configured to access the memory and execute the instructions, and control the drive motor based on sensing information detected from the at least one sensor module.

A drive control unit that performs vector control of a synchronous motor determines reference phase angles of 3-phase/DQ converters, and a DQ/3-phase converter. When speed of a synchronous motor is equal to or higher than a predetermined threshold value, the reference phase angle is obtained by adding a correction angle such that D-axis voltage feedback output from 3-phase/DQ converter becomes zero to the detection angle of a position detector. And when the speed of the synchronous motor is less than a predetermined threshold value, the reference phase angle is obtained by adding a low speed load angle set in advance to the detection angle of the position detector. In a vector control operation, a power factor is achieved by controlling the D-axis current to be zero.

A drive control unit that performs vector control of a synchronous motor determines reference phase angles of 3-phase/DQ converters, and a DQ/3-phase converter. When speed of a synchronous motor is equal to or higher than a predetermined threshold value, the reference phase angle is obtained by adding a correction angle such that D-axis voltage feedback output from 3-phase/DQ converter becomes zero to the detection angle of a position detector. And when the speed of the synchronous motor is less than a predetermined threshold value, the reference phase angle is obtained by adding a low speed load angle set in advance to the detection angle of the position detector. In a vector control operation, a power factor is achieved by controlling the D-axis current to be zero.