Electricity: motive power systems – Braking – Dynamic braking
Patent
1997-03-14
1998-09-29
Sircus, Brian
Electricity: motive power systems
Braking
Dynamic braking
318432, 361232, H02P 314
Patent
active
058149554
ABSTRACT:
A control circuit for an overhead crane motor includes a low supply voltage monitor to disconnect the motor from the control circuit and ensure brakes engage in the event of interruption of power supplied to the crane. A sensor circuit detects whether voltage supplied to the control circuit drops below a predefined threshold level which is greater than a voltage magnitude produced by the motorN operating in a regenerative mode during a power interruption. A switching circuit responds to sensing supply voltage below the threshold level by disconnecting electrical current to a relay coil which causes contacts to open which result in the motor being electrically disconnected from the control circuit. As a result of that disconnection, voltage produced by the motor operating in a regenerative mode does not inhibit electrically controlled mechanical brakes from engaging.
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Bauer Michael E.
Urbassik Michael A.
Eaton Corporation
Sircus Brian
LandOfFree
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