A motor control device includes: a communication interface receiving from an external device a control command for defining a target rotation amount and a target rotation speed of the motor; a sensor interface connected with a first rotation angle sensor outputting a first detection signal in every rotation of the motor at a first angle or a second rotation angle sensor outputting a second detection signal in every rotation of the motor at a second angle larger than the first angle; a controller obtaining a measured value of a rotation speed of the motor based on a reception interval of the first or second detection signal, to decide a set value of the rotation speed to bring the measured value close to the target rotation speed; and a drive signal generator generating a drive signal for rotating the motor according to the set value, and outputting the drive signal.

A method and system for reducing rollback in a counterbalancing system as a holding brake is released is disclosed. A limited amount of movement of a drive shaft is present in the holding brake. A motor drive provides current to the motor with the holding brake set such that a torque is applied at the drive shaft. The current is controlled to generate torque in both directions. The limited amount of movement in the brake may be used to determine a direction and magnitude of torque required to support a mechanical load being applied to the motor. The motor drive then provides a current to generate the necessary torque required to support the load prior to releasing the holding brake.

A power machine can include a frame, a lift arm, and one or more electrical devices for control of one or more work elements. The electrical devices can be controlled to improve positional accuracy for work elements during work operations, to improve power management and customer experience (e.g., to provide smoother ride during drive operations), and to provide float functionality for work elements.

In an actuator, a control board is situated between an electric motor and a worm wheel, and a connector is disposed on the control board. Thus, a longitudinal dimension of the actuator is easily reduced. Since the worm wheel is situated on a same side as an output shaft relative to a worm, a width of the actuator is easily reduced.

In an actuator, a control board is situated between an electric motor and a worm wheel, and a connector is disposed on the control board. Thus, a longitudinal dimension of the actuator is easily reduced. Since the worm wheel is situated on a same side as an output shaft relative to a worm, a width of the actuator is easily reduced.

An electric machine includes a stator and a rotor energizable by magnetic fields produced by the stator when receiving a stator current to produce relative motion between the rotor and the stator. A controller is configured to send the stator current through the stator at a current angle measured from the closest one of a pole of the rotor, determine a desired operational output of the electric machine, and determine a desired rotor motion corresponding to the desired operational output of the electric machine. The controller is further configured to calculate a vector control modulation applied to the stator that elicits the desired rotor motion, and adjust the current angle of the stator current based on the vector control modulation to cause the rotor to perform the desired rotor motion and achieve the desired operational output of the electric machine.

The invention discloses a roller shutter equipment, a motor and a brake device, The brake device is used for braking motor rotor. The brake device includes a permanent magnet and a magnetic conductor, one of the permanent magnet and the magnetic conductor is used for connecting the motor rotor and the other one is used for connecting the motor stator. The permanent magnet includes N magnetic poles, the magnetic conductor includes N slots, the brake device constitutes a N poles N slots structure, where N is an integer greater than 1. The brake device is applied to motor and roller shutter equipment, it realizes rapid braking, at the same time it can effectively reduce the vibration frequency of the motor and avoid the vibration frequency of the cover shell of the roller shutter equipment. It avoids resonance, ensures normal operation of the motor and reduces motor noise during operation.

The invention discloses a roller shutter equipment, a motor and a brake device, The brake device is used for braking motor rotor. The brake device includes a permanent magnet and a magnetic conductor, one of the permanent magnet and the magnetic conductor is used for connecting the motor rotor and the other one is used for connecting the motor stator. The permanent magnet includes N magnetic poles, the magnetic conductor includes N slots, the brake device constitutes a N poles N slots structure, where N is an integer greater than 1. The brake device is applied to motor and roller shutter equipment, it realizes rapid braking, at the same time it can effectively reduce the vibration frequency of the motor and avoid the vibration frequency of the cover shell of the roller shutter equipment. It avoids resonance, ensures normal operation of the motor and reduces motor noise during operation.

A DC electric motor for driving a tailgate of a vehicle is provided, the DC electric motor including a rotor and a stator, the rotor being rotatably supported about an axis of rotation, at least one of the rotor and the stator having a magnetic asymmetry for generating an asymmetric magnetic interaction between the rotor and the stator, wherein the rotor and the stator are configured to assume first positions and second positions relative to each other, wherein a higher holding torque acts between the rotor and the stator in one of the first positions than in one of the second positions due to the asymmetry.