Electrical generator or motor structure – Dynamoelectric – Rotary
Patent
1993-12-30
1998-06-23
Stephan, Steven L.
Electrical generator or motor structure
Dynamoelectric
Rotary
310215, H02K 348
Patent
active
057709106
ABSTRACT:
An improved switched reluctance motor (1) has a stator assembly (3) and a rotor assembly (5) mounted for rotation relative to the stator assembly. A stator (9) has a plurality of stator teeth (11) defining stator slots (17) therebetween. Stator winding sets (19, 21) include coils inserted in the slots in concatenated pattern in which one part of a coil is inserted in one stator slot and another part of the coil is inserted in the adjacent stator slot. The part of one coil (19a) inserted in a slot is positioned adjacent an inner end of the slot, and a part of a coil (21a) of the second winding set is inserted in the slot toward the outer end of the slot. A wedge (25) is inserted in each slot after the concatenated sets of windings are installed therein. Each wedge is sized to fit in the outer end of a slot and extends the length of the slot. The wedge has a curved outer surface (27) which generally corresponds to the curvature of the end of the teeth adjacent the rotor assembly. An inner surface (33) of each wedge is generally flat and bears against the portion of the coil (21a) located adjacent the outer end of a slot. The wedge compresses the coils sets into the slot. Insertion of wedges in the slots both increases the fill factor of the stator and reduces motor noise caused by movement of the stator windings.
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Emerson Electric Co.
Stephan Steven L.
Wallace, Jr. Michael J.
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