The PMFS-series electrically off clutches and brakes are designed to control the motion of a rotating motor shaft. The clutch engages the motor shaft and provides power to the drive train. The clutch is activated electrically; when power is turned off or interrupted, a powerful permanent magnet disengages the clutch from the rotating shaft. The brake stops a rotating shaft. The brake is held off electrically, a field coil creating the magnetic holding force. When power is shut off or interrupted, a powerful permanent magnet causes the brake to activate, stopping the shaft rotation. Permanent magnet clutches and brakes have a larger torque to weight ratio than comparable spring-set devices.
Rotating shaft clutches and brakes provide rotary motion control on a space craft, launch vehicle, aircraft, land-based vehicle or commercial and industrial equipment.