Brake sequenced elevator motor speed control

Details Brake sequenced elevator motor speed control Brake sequenced elevator motor speed control

1988-08-15

1990-12-04

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Friction braking

318365, 187108, H02P 300

Patent

active

049756273

ABSTRACT:
In an elevator, an electric motor is connected to a brake through a gearbox. The brake is controlled with an electromagnet. A torque signal is applied to the motor. Brake voltage characteristics are used to detect actual brake engagement and to signal a switch to substitute a decaying torque control signal to the motor for the motor torque signal supplied to the motor while the elevator is moving. Motor torque is thereby gradually rather than suddenly reduced to zero.

REFERENCES:
patent: 1066742 (1913-07-01), Lutz
patent: 1931564 (1933-10-01), White et al.
patent: 2385671 (1945-09-01), Whiting
patent: 2503438 (1950-04-01), Gruner
patent: 2600568 (1952-06-01), Nelson
patent: 3136938 (1964-06-01), Grepe
patent: 4139810 (1979-02-01), Ueki et al.

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