Mechanical brake hold circuit for an electric motor

Details Mechanical brake hold circuit for an electric motor Mechanical brake hold circuit for an electric motor

1994-10-31

1996-03-05

Ro, Bentsu

Electricity: motive power systems

Braking

Plural, diverse or diversely controlled braking means

369 34, H02P 326, G11B 1722

Patent

active

054970571

ABSTRACT:
An automated tape library employing a motorized robotic picker wherein the electric motor driving the robotic picker is equipped with two brakes that act simultaneously. The first is a mechanical brake which uses a spring to push a brake pad against the rotating motor. During normal motor operation, an electric solenoid is used to overcome the spring and disengage the brake pad from the motor. When the robotic picker is to be mechanically stopped, the solenoid voltage is turned off and the solenoid releases the spring placing the brake pad in contact with the motor. The second brake is a dynamic electrical brake which makes use of the back emf of the motor to drive a current back into its own windings such that the motor decelerates.

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