Patent ID: 7963374
Filing Date: 2011-06-21
Classification: F16D,H02P

Abstract:
1. A power-off electromagnetic brake in which an armature that is pressed to a rotating member by a spring force is attracted to a yoke by an electromagnetic attraction force generated by energizing an exciting coil and a brake force operating on the rotating member is released, the brake comprising: a brake power supply; switching signal generation means for generating a switching signal that switches on and off at a prescribed cycle and a prescribed duty ratio; continuous energizing means for continuously energizing said exciting coil with a direct current at a constant voltage for a fixed length of time in order to attract said armature to said yoke when said brake power supply is switched on; and intermittent energizing means for intermittently energizing said exciting coil with a direct current at said constant voltage using said switching signal in order to hold a brake release state in which said armature is attracted to said yoke after a fixed length of time has elapsed.