Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1990-10-01
1992-03-03
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310 72, 310180, 310 68D, 361 21, H02K 1100, H02K 316, H02K 2304, H02H 706
Patent
active
050935976
ABSTRACT:
A saturable reactor diode snubber assembly is provided for use witha brushless excitation system. The diode snubber provided includes a thin film member composed of a saturable magnetic material. The magnetic material is saturated for a large percentage of the current cycle of each pase of the ac exciter. When the current approaches zero and the diode approaches reverse recovery, the magnetic film member of the present invention comes out of saturation and turns linear increasing overall exciter inductance and decreasing current fall rate, thereby reducing reverse recovery peak current and diode stored energy. This in turn reduces the effects of voltage spikes normally experienced during diode reverse recovery. The magnetic material is used at a predetermined thickness such that a desired result is obtainable. One embodiment of the invention involves placing the magnetic material on the side of the armature slot wedge adjacent to the top coil.
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LaBalle C.
Stephan Steven L.
Westinghouse Electric Corp.
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