A braking test for a high lift system. The system including a plurality of high lift surfaces movably arranged at a wing, a plurality of drive stations coupled with the high lift surfaces via a transmission shaft, a power drive unit coupled with the transmission shaft including an electric motor operably coupled with a brake, and a control unit operably coupled to the power drive unit. The control unit executing a method for testing the brake, including actuating an electric motor, acquiring a sensor output of a sensor coupled during the actuating of the motor and determining a motion of the motor, activating a selected brake under test, measuring an elapsed time until the brake has arrested the motion, and determining if the elapsed time is less than a threshold. Generating a brake failure signal for the selected brake if the elapsed time exceeds the threshold.

A braking test for a high lift system. The system including a plurality of high lift surfaces movably arranged at a wing, a plurality of drive stations coupled with the high lift surfaces via a transmission shaft, a power drive unit coupled with the transmission shaft including an electric motor operably coupled with a brake, and a control unit operably coupled to the power drive unit. The control unit executing a method for testing the brake, including actuating an electric motor, acquiring a sensor output of a sensor coupled during the actuating of the motor and determining a motion of the motor, activating a selected brake under test, measuring an elapsed time until the brake has arrested the motion, and determining if the elapsed time is less than a threshold. Generating a brake failure signal for the selected brake if the elapsed time exceeds the threshold.

A method and device for operating a brushless electric motor, having windings controlled by an inverter using six switches. The inverter includes three outputs that are associated with the windings of the electric motor. A respective power semiconductor switch is arranged between the outputs of the inverter and the windings, and wherein a detection unit detects defective switches, a measuring unit measures the voltage at the outputs of the inverter, and a motor angle position sensor determines the motor angle position arc. The invention further relates to a device for operating a brushless electric motor. The inverter is switched off after a defective switch has been detected, such that no additional power is introduced in the windings of the electric motor. The motor angle position sensor consecutively opens the power semiconductor switches in a predetermined motor angle position.

A pedal device includes a pedal lever, an actuator, and a control unit. The pedal lever operates in response to a pedal operation. The actuator can apply a reaction force that is a force in a direction of returning the pedal lever by driving a motor. The control unit includes a current command calculation section that calculates a current command value based on a reaction force target value related to a reaction force applied to the pedal lever and a duty calculation section that calculates a duty command value based on the current command value, and controls a drive of a motor based on the duty command value. The duty calculation section corrects the duty command value based on at least one of a motor current supplied to the motor and a rotation speed of the motor.

A brake control device for controlling a power-off brake device, the brake control device comprising: a power supply controlled so as to output a voltage or so as not to output a voltage in accordance with a power supply control signal; a brake control unit for outputting a brake control signal; an opening/closing unit for opening/closing an electric circuit between the power supply and the brake device in accordance with the brake control signal; a state detection unit for outputting a state detection signal indicating the potential state of the electric circuit between the opening/closing unit and the brake device; an abnormality detection unit for detecting whether or not an abnormality has occurred on the basis of a combination of the details of the brake control signal and the details of the state detection signal; and a power supply control unit for outputting, as the power supply control signal for the power supply, an output-off signal for controlling the power supply so as not to output a voltage when the abnormality detection unit determines that an abnormality has occurred.

A circuit arrangement is configured to supply an electromagnetic holding brake of an electric motor with an operating voltage for releasing the holding brake, and a voltage that is reduced relative to the operating voltage for holding the holding brake in the released position. The operating voltage is supplied from a higher-level control system disposed separately from the motor and the holding brake. The circuit arrangement is disposed in or on the motor or in or on the holding brake and includes a voltage regulator adapted to regulate, independently of the operating voltage, the reduced voltage to a fixed value after the holding brake is released.

A control circuit configured to control an electromechanical brake is provided. The control circuit includes: a switching regulator configured to control a magnitude of voltage applied to a brake coil of the electromechanical brake; wherein said switching regulator includes at least one semiconductor switch, one diode, one capacitor and one inductor; the control circuit is configured such that, in operation, at least one signal from a process sub-system specifies the magnitude of the voltage for the brake coil; and at least one brake applying control signal from a safety sub-system can cause the brake coil voltage to be reduced to a level low enough to apply the brake by opening a switch and each brake applying control signal from the safety sub-system has a corresponding diagnostic feedback signal to the safety sub-system that indicates the state of the corresponding switch. A method and a system are disclosed.

A brushless motor drive device includes the following: an inverter circuit configured to energize and drive the winding of a brushless motor; a current detection circuit configured to detect the current value of the winding; a control unit configured to control the rotation of the motor; and an RC filter including a resistor and a capacitor. The control unit includes the following: a drive control unit configured to generate a signal to drive the inverter; a clock generation circuit configured to generate a clock pulse to be used as a reference for an operation period; a pulse output circuit configured to generate a pulse signal with a changing frequency based on the clock pulse and to apply the pulse signal to the RC filter; an AD converter circuit connected to the capacitor of the RC filter and the current detection circuit; and an AD-conversion-error calculation unit configured to calculate the conversion error of the AD converter circuit. The AD-conversion-error calculation unit calculates the conversion error based on the difference between the output value of the AD converter circuit produced in response to an input of the voltage of the capacitor and an AD-converted value calculated from the charging time of the capacitor.

A method and controller for controlling the torque in a wind turbine is described wherein the wind turbine is configured to deliver power via a converter to a public grid. The method comprises the steps of: receiving a fault signal; and, in response to said fault signal, a converter controller controllably ramping down the torque of said turbine from a nominal torque value to a predetermined low torque value within a predetermined time window selected from 0.2-2 seconds, preferably 0.5-1.5 seconds.

A method and controller for controlling the torque in a wind turbine is described wherein the wind turbine is configured to deliver power via a converter to a public grid. The method comprises the steps of: receiving a fault signal; and, in response to said fault signal, a converter controller controllably ramping down the torque of said turbine from a nominal torque value to a predetermined low torque value within a predetermined time window selected from 0.2-2 seconds, preferably 0.5-1.5 seconds.