Motor with multipurpose stator
AssigneeElectric Motors and Specialties, Inc.
InventorRobert G. Nutter
Life of this patent
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Abstract
A permanent split capacitor electric motor is constructed by using existing components of a known shaded pole motor design to reduce engineering, tooling, inventory and other manufacturing costs of the new motor and, potentially, the known design through economics of scale. The alterations to the known motor principally involve different winding circuits and the addition of a capacitor. The new motor can be reversed with a single switch circuit.
Claims11
A permanent split capacitor motor having a stator forming a plurality of salient poles, the poles having faces distributed about a common axis and forming a bore, a squirrel cage rotor disposed in the stator bore, a bearing supporting the rotor for rotation in the stator bore, first and second coils associated with each of said poles, said first and second coils having respective centers that are spaced circumferentially, with reference to the axis, from one another, a pair of lines for supplying single phase power to the coils, a capacitor interposed between one of said first and second coils of each of said poles and one of said power lines, at least two of said poles having a shaded pole portion.
A method of making a single phase permanent split capacitor motor comprising utilizing a stator having an even number of salient poles, the poles each being divided into two portions and having a configuration usable in the regular manufacture of shaded pole motors, at each pole winding a first coil about one of said portions and subsequently winding a second coil about both of said portions, electrically connecting all of the first coils together in a first winding set and all of the second coils together in a second winding set, electrically connecting a capacitor between the first and second winding sets, arranging the leads from the first and second winding sets to enable single phase AC line power to be applied to both winding sets, one of said winding sets being connected to a side of the line power through a capacitor while the other of said winding sets is connected to said one side independently of said capacitor.
Dependencies are inferred from the claim text.