Locking devices and control circuitry for permanent magnet electric motors

摘要: A positive locking device is provided in order to prevent a motor from rotating after power has been removed. The plate mounted on the which engages disk or hub shaft of motor. In another aspect invention, solid state circuitry for switching permanent magnet and providing dynamic braking thereto provided. allows back EMF generated by armature coils cause current flow through when This may be used help produce smooth engagement device. circuit dual By applying one other two oppositely wound made rotate either direction. When removed active armature, this short-circuited diode. same diode dynamically brake armature. both cases spinning rotor will quickly slow down facilitate