Electricity: measuring and testing – Impedance – admittance or other quantities representative of... – Lumped type parameters
Reexamination Certificate
2006-08-22
2006-08-22
Deb, Anjan (Department: 2858)
Electricity: measuring and testing
Impedance, admittance or other quantities representative of...
Lumped type parameters
C324S522000, C318S375000
Reexamination Certificate
active
07095244
ABSTRACT:
A system and a method for determining operational states of first and second electrical contacts in a motor are provided. The motor has first, second, and third phase windings. The first phase winding is electrically coupled between first and second nodes. The second phase winding is electrically coupled between a third node and the second node. The third phase winding is electrically coupled between a fourth node and the second node. The first electrical contact is electrically coupled between the first node and the third node. The second electrical contact is electrically coupled between the third node and the fourth node. The method includes applying a first voltage signal to the first phase winding at a first time and measuring voltage signals at the third and fourth nodes to determine first and second operational states of the first and second electrical contacts.
REFERENCES:
patent: 4990837 (1991-02-01), Ishitobi
patent: 5574346 (1996-11-01), Chavan et al.
patent: 2005/0185350 (2005-08-01), Wakefield et al.
Deb Anjan
Delphi Technologies Inc.
He Amy
Smith Michael D.
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