Motor coil-shorting detecting unit

Details Motor coil-shorting detecting unit Motor coil-shorting detecting unit

2008-05-13

2008-05-13

Sherry, Michael (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Motor protective condition responsive circuits

C361S023000, C361S024000, C361S030000

Reexamination Certificate

active

11299685

ABSTRACT:
In order to be acceptable for safety critical applications, it is necessary for an electrical machine to allow continued operation despite an electrical short circuit in one of the operational phases of that electrical machine. It will be appreciated that an electrical short circuit creates excessive electrical current through the short circuit with significant heating and other detrimental effects. However, the electrical machine can operate with one operational phase disabled. In such circumstances, the present invention incorporates means for determining an electrical short circuit has occurred and then injects an electrical current approximately equal to or greater than the rated electrical current. In such circumstances, the operational phase or coil4, 24, 34is effectively protected despite the electrical short circuit and hence the electrical machine can continue to operate.

REFERENCES:
patent: 5223775 (1993-06-01), Mongeau
patent: 5612629 (1997-03-01), Mullin
patent: 6265891 (2001-07-01), Yamada
patent: 6750576 (2004-06-01), Ehrhart et al.
patent: 2001/0035688 (2001-11-01), Sawada et al.
patent: 2002/0163820 (2002-11-01), Nakamura
patent: 1 317 057 (2003-06-01), None

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