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

1993-03-08

1994-07-05

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318370, H02P 304

Patent

active

053270550

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 fixed 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. The circuit further prevents mechanical brake engagement even at lower motor speeds when back emf is relatively low but robot speed is fast enough to cause mechanical damage if stopped via the mechanical brake.

REFERENCES:
patent: 2421187 (1947-05-01), Derungs
patent: 3136938 (1964-06-01), Grepe et al.
patent: 3466524 (1969-09-01), Cooper
patent: 3486097 (1967-05-01), Shekro
patent: 4095680 (1978-06-01), Vogelsang
patent: 4223855 (1980-09-01), Briedis
patent: 4278298 (1989-07-01), Sauka et al.
patent: 4494058 (1985-06-01), Berti
patent: 4931711 (1990-06-01), Naruo
patent: 5070290 (1991-12-01), Iwasa

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