Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1993-04-06
1995-01-31
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310269, H02K 524, H02K 124
Patent
active
053861620
ABSTRACT:
A multiple phase switched reluctance motor (30). A stator assembly (32) has a plurality of inwardly salient teeth (34a-34l) terminating at a central bore (36) and at least one redundant pole set for each motor phase. A rotor assembly (38) disposed for rotation in the bore has a plurality of rotor teeth (42a-42d). The number of rotor teeth is proportional to the number of stator teeth. The pole redundancy helps distribute ovalizing forces on the motor assembly. This lessens the effect of these forces and reduces motor noise produced by the assembly in response to the forces. The stator may have multiple teeth per pole and the rotor a multiple of the determined rotor teeth. The number of rotor teeth exceeds the number of stator teeth so the rotor teeth overlap the stator teeth. This improves starting torque in a desired direction of motor rotation. The ratio between stator poles and rotor poles includes the following for single tooth per pole motor constructions 6(n):2(n); 6(n):4(n); 6(n):8(n); 8(n):6(n); 8(n):10(n); where n is a positive whole integer having a value of 1 or 2 for some motor applications, and a higher value for certain ratios for other applications. In addition, in some motor constructions, the rotor teeth are formed to provide dual air gaps between the stator and rotor assemblies.
REFERENCES:
patent: 4186316 (1980-01-01), Singh
patent: 4998052 (1991-03-01), Erdman et al.
patent: 5111096 (1992-05-01), Horst
patent: 5233254 (1992-03-01), Fisher et al.
patent: 5239217 (1993-08-01), Horst
patent: 5260620 (1993-11-01), Morrill
Emerson Electric Co.
Jones Judson H.
Stephan Steven L.
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