Hoist motor protection

Details Hoist motor protection Hoist motor protection

1988-07-01

1989-05-23

Shoop, Jr., William M.

Electricity: motive power systems

Automatic and/or with time-delay means

Time or with time-delay means

187108, 187112, H02P 304, B66B 106

Patent

active

048333808

ABSTRACT:
In an elevator system in which the elevator cars are moved by a hoist motor with a brake and the hoist motor is energized by controls to cause energization of the motor, movement of a car and release of the brake, motor protecting circuits which are time rather than current magnitude responsive. One protective circuit includes a time delay relay which is activated upon energization of the motor and which causes deenergization of the motor if the motor is energized longer than the time it normally takes a car to travel from the lower floor to the upper floor or vice versa. The other protective circuit includes a time delay relay which is activated when the motor is energized and the brake fails to release and which cause deenergization of the motor if the brake fails to release within a predetermined time. Either circuit may be used alone. Also, an indicator to indicate operation of a time delay to deenergize the motor.

REFERENCES:
patent: 3369633 (1968-02-01), Martin
patent: 4680512 (1987-07-01), Melocik

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