HOLDING BRAKE CONTROL CIRCUIT FOR SERVO-MOTOR.

摘要

A holding brake control circuit is provided for use in conjunction with a servo-motor having an electrically operated holding brake. The holding brake has a pair of electric brake terminals and the brake is retained in a released condition as long as at least a preset brake voltage is maintained to the brake terminals. The holding brake control circuit includes a pair of output terminals connected to the electric brake terminals as well as a pair of power input terminals electrically connected to an electric power source. The electric power source, furthermore, has a higher voltage than the preset brake voltage. At least one capacitor is electrically connected in parallel with the input terminals so that the capacitor charges when power is applied to the input terminals. A voltage regulator has power inputs connected in parallel with the capacitor and a regulated voltage output connected in parallel with the output terminals for the control circuit. The voltage regulator has a regulat ed output voltage greater than or equal to the preset brake voltage. Upon failure of the power supply or main power outage, the brake control circuit maintains the brake in a released condition for a period of time following failure of the power supply.