Stator arrangement for a synchronous motor
AssigneeEmhart Industries, Inc.
InventorRobert F. Weaver
Life of this patent
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Abstract
A synchronous motor wherein a field coil is positioned adjacent to a rotor and stator assembly in a side-by-side relationship has a stator pole arrangement to compensate for flux phase differences caused by the side-by-side arrangement.
Claims7
A method of providing good starting characteristics in a synchronous motor which includes inter-meshed stator poles and a permanent magnet rotor with rotor poles rotating with said inter-meshed stator poles and wherein a field coil which generates flux to cause said rotation of said rotor is disposed adjacent said inter-meshed stator poles in a side-by-side relationship, the method comprising:
- (a) providing shading means for a predetermined number of said stator poles to provide a group of shaded poles and a group of unshaded poles,
- (b) selecting a reference pole from each of said groups,
- (c) determining the flux phase difference between said reference pole and individual poles of a group,
- (d) converting said phase difference to a mechanical angle and locating said individual poles with respect to each other according to said mechanical angle.
In a self-starting synchronous motor wherein a permanent magnet rotor having rotor poles rotates within an assembly of inter-meshed stator poles in response to flux generated by a field coil that is disposed adjacent to said assembly in a side-by-side relationship an improvement comprising:
- (a) shading means electrically coupled to a predetermined number of stator poles to provide a group of shaded stator poles and a group of unshaded poles, and
- (b) individual poles of each group offset from a reference pole by a mechanical angle determined by a flux phase difference between said reference pole and individual poles of each group.
Dependencies are inferred from the claim text.