Circuit for automatic operation of a series brake upon detection

Details Circuit for automatic operation of a series brake upon detection Circuit for automatic operation of a series brake upon detection

1998-12-29

1999-10-05

Shoop, Jr., William M.

Electricity: motive power systems

Braking

Friction braking

361 93, H02K 710

Patent

active

059629983

ABSTRACT:
A circuit for initiating the setting of a series brake upon detecting a loss of armature current in an overhauling DC crane motor. The circuit includes an ammeter shunt, a meter relay and associated contact, a meter relay power supply, a control relay and associated contact, a low current relay and associated contact and two static timers which can be added to an existing crane operating circuit. The ammeter shunt is located electrically in series with motor armature for monitoring current flow in the armature. The meter relay is connected to the ammeter shunt such that it will operate in response to a signal from the ammeter shunt indicating that current in the motor armature has dropped below a predetermined level. The meter relay requires power for operation, this power being provided by the 24 VDC power supply. To ensure that a false armature current loss signal is not processed by the meter relay at the beginning of a lowering operation, a static timer is placed in series with the power supply relay to delay the power supply operation until the armature current is above the predetermined minimum level. In response to a loss of armature current, the meter relay operates the associated contact, which in turn operates a low current relay and associated contact and a control relay and associated contact. These relays and contacts cause a lowering relay in the control circuit to energize and open an associated contact in the crane motor circuit. Opening of the crane motor circuit de-energizes a series-wound solenoid, thereby setting a series mechanical brake controlled by the series-wound solenoid.

REFERENCES:
patent: 3584706 (1971-06-01), Hall
patent: 3601672 (1971-08-01), Horsley
patent: 3624783 (1971-11-01), Chang
patent: 4207508 (1980-06-01), Habisohn
patent: 4509620 (1985-04-01), Verbos
patent: 5814955 (1998-09-01), Bauer et al.

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