According to an embodiment of the present invention, a control device of an opening and closing member for a vehicle including a control portion outputting a control signal that switches a connection of a switch portion to control a drive motor closing and opening the opening and closing member mounted on the vehicle and a detection portion outputting a signal indicating the rotary direction of the drive motor to the control portion, wherein the control portion determines whether or not the switch portion is stuck on a basis of the signal from the detection portion, and in a case where the control portion determines that the switch portion is stuck, the control portion outputs the control signal for switching the connection of the switch portion so as to stop the drive motor and to maintain the drive motor in a stop state is provided.

Lathe control systems and methods are described including stopping a motor prior to reversing direction as well as methods and systems that implement voltage and/or current protection thresholds.

A filter for use with a brushless DC motor to filter a signal received from a floating terminal of the brushless DC motor, wherein the filter is configured such that a time delay introduced by the filter to the signal received from the floating terminal is equal to the time taken for a rotor of the motor to rotate through an angle equal to half of a commutation step of the motor.

A backup controller which is capable of suppressing an unintended operation performed by a motor which rotates in both of a normal rotation direction and a reverse rotation direction is provided. The control unit of the backup controller activates the second relay and the backup circuit in a case where a state in which the motor is rotating in the first direction even though the first relay is not activated is transmitted from the monitoring unit. Further, the control unit activates the first relay and the backup circuit in a case where a state in which the motor is rotating in the second direction even though the second relay is not activated is transmitted from the monitoring unit.

A direct current electrical machine, which includes a rotor that generates a rotor magnetic field, a first commutation cell that includes a winding component, a first switching device, and a second switching device. The first winding component includes a first portion electrically coupled between a first terminal and a second terminal of the first winding component and a second portion electrically coupled between a third terminal and the second terminal of the first winding component. The first switching device is electrically coupled to the first terminal and is closed when a first voltage induced across the first portion by rotation of the rotor magnetic field is positive; and the second switching device is electrically coupled to the third terminal and is closed when a second voltage induced across the second portion by the rotation of the rotor magnetic field is negative.

Methods and systems include an actuator 40 adapted to provide drive power and hold power to an external device. A motor 34 provides for driving the external device to a determined position when the motor 34 is energized. A switching circuit is configured to energize the motor 34 with a high voltage to drive the external device to the determined position and energize the motor 34 with a low voltage to hold the external device in the determined position.

A fluid sprayer includes a housing, a pump, a nozzle, a high voltage direct current (HVDC) brushed electric motor that drives the pump, and a motor controller electrically connected to the motor. The motor controller drives the motor with a high speed pulse width modulated (PWM) drive signal that switches current through the motor on and off. The motor controller varies the PWM signal as a function of a spray setting input and sensed current through the motor.

A fan motor controller comprises a pulse width modulation signal, a switch circuit, a control unit, and a frequency judging unit. The switch circuit is coupled to a fan motor for supplying a driving current to the fan motor. The control unit generates a control signal to the switch circuit, so as to control the switch circuit. The frequency judging unit receives the pulse width modulation signal for generating a judging signal to the control unit. The pulse width modulation signal is configured to adjust a speed of a fan. The pulse width modulation signal has a frequency. Based on the frequency and a judgment rule, the fan motor controller is configured to attain the function of switching between the forward direction and the reverse direction of the fan.

A method and a circuit for controlling electric power delivered to an electric motor are disclosed. A forward control signal is transmitted when a forward command is received while a forward latch is not set. The forward latch is set and the forward control signal is stopped when a power level of the motor exceeds a threshold while the forward command is received. The forward latch is reset and a reverse control signal is transmitted when a reverse command is received. The reverse and forward control signals are not transmitted when no command is received. A reverse latch is optionally set when the power level exceeds the threshold while the reverse command is received. A winch connected to the motor has a cable wound thereon in a forward direction of the motor and unwound therefrom in a reverse direction of the motor, as controlled by the circuit.

A bipolar current control drive circuit for an inductive load includes a switching power supply circuit in which an alternating current from a power supply is formed to a direct current smoothed through a rectifier bridge diode and a primary smoothing capacitor, the current is transmitted to a secondary side using a switching transformer, and the current is formed to a direct current. The switching transformer includes a first secondary coil and a second secondary coil for one primary coil to form alternating currents from the secondary coils to direct currents in reverse orientations and output the currents to an inductive load. A polarity control circuit controls switching between closing and opening of a first secondary switching element and a second secondary switching element and controls the polarity of an electric current.