US3774062A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stator assembly for single phase induction motor employing aluminum alloy starting winding
Assignee: General Electric Co
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Filing: 1971-12-20
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Granted: 1973-11-20
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Expires: 1991-12-20
Abstract
Abstract Stator assembly for a motor includes slotted magnetic core with main and auxiliary windings in core slots. Main winding comprises at least two sections each forming a main pole. Auxiliary winding in form of a starting winding also includes at least two sections forming poles angularly displaced from the main poles. Each starting winding is formed of a material that yields the same motor operating performance as a copper starting winding design with a backlash section and yet is provided with fewer, if any, backlash turns as compared to such copper winding arrangement. Preferred auxiliary winding materials have an electrical conductivity of about 29% IACS (International Annealed Copper Standard), a density of about 0.1 pound per cubic inch, and a specific heat at 25* Centigrade of about 0.2 calories per gram per degree Centigrade. When alloy materials are used, the major alloying material or materials, in terms of percentage by weight of the alloy, comprise a sufficiently large percent of the alloy (by weight) that normal manufacturing and processing variations causing variations in the amount of such alloying material or materials still permit the economical manufacture of an alloy having a desired nominal resistivity.
Inventors
- 👤 J Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:25
CPC Classifications
H; H02; H02K; H02K3/00; H02K3/02; H02K17/00; H02K17/02; H02K17/04; H02K3/04; H02K3/28
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
53 words
The stator assembly of claim 1 wherein the first and second windings each comprise a plurality of coils having at least one winding turn each, and wherein the preselected winding material is an alloy of aluminum that includes an alloying metal that comprises at least about 4 percent by weight of the alloy.
Claim 2
Dependent Claim
49 words
The stator assembly of claim 1 wherein said first winding comprises a plurality of coils each having at least one winding turn; the second winding includes a plurality of winding coils each having at least one winding turn; and wherein the preselected winding material is an alloy of aluminum.
Claim 3
Dependent Claim
30 words
The stator assembly of claim 3 wherein the preselected winding material has an electrical conductivity less than about 40 percent IACS and includes at least about 4% by weight magnesium.
Claim 4
Dependent Claim
131 words
A stator assembly for a dynamoelectric machine comprising a laminated magnetic core having coil accommodating regions and a plurality of winding turns supported thereon; at least some of said winding turns being formed from a preselected winding material having a characteristic ratio R greater than about 6.5 where R is defined by the relationship Rho /Cp d, where: Rho is the electrical resistivity, in micro-ohm centimeters of the preselected winding material, Cp is the specific heat in calories per degree Centigrade per gram of the preselected winding material, and d is the weight density in grams per cubic centimeter of the preselected winding material; thereby to provide a dynamoelectric machine having at least some winding turns formed of a relatively high resistivity as compared to the resistivity of electrical conductor copper.
Claim 5
Dependent Claim
54 words
The stator assembly of claim 5 wherein at least some of said plurality of winding turns are arranged to establish first polar axes; and other ones of said plurality of winding turns establish other polar axes angularly displaced from the first polar axes; and wherein the preselected winding material is an alloy of aluminum.
Claim 6
Dependent Claim
44 words
The stator assembly of claim 6 wherein the preselected winding material is of a given diameter and the tensile strength of the preselected winding material is greater than the tensile strength of a conductor formed of EC aluminum and of the same given diameter.
Claim 7
Dependent Claim
142 words
A stator assembly for a resistance split-phase induction motor, a magnetic stator core member having a plurality of winding slots formed therein each having a closed end; a primary field winding comprising at least two primary poles having a primary polar axis, each primary winding pole comprising a plurality of coils each having sides occupying a different pair of said slots at the closed ends thereof; and an auxiliary field winding comprising at least two auxiliary Poles each having an auxiliary polar axis angularly displaced from the primary polar axis; each primary pole comprising a plurality of coils of winding turns and having sides occupying a different pair of said slots; at least some of the winding turns of the auxiliary being formed of an aluminum alloy wire having a nominal electrical conductivity of from about 18% IACS to about 40% IACS.
Claim 8
Dependent Claim
53 words
The stator assembly of claim 8 wherein the primary pole of the stator assembly is adapted for connection in series circuit relation with a current responsive relay arranged to selectively supply excitation current to the auxiliary winding and wherein the auxiliary winding turns in each auxiliary pole are wound in the same direction.
Claim 9
Dependent Claim
103 words
The stator assembly of claim 8 wherein the auxiliary and primary windings are arranged to be connected in parallel circuit relation; the resistance-to-reactance ratios of the primary and auxiliary windings are preselected to establish phase displaced winding currents in the primary and auxiliary windings during concurrent excitation of said windings; and wherein the aluminum alloy auxiliary winding turns in each auxiliary winding pole provide an electrical resistance of a magnitude thereby to reduce the need for auxiliary winding turns arranged in substracting magnetic relation in an auxiliary pole relative to other auxiliary winding turns in the same auxiliary pole, when excited, is reduced.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |