United States Patent m
Druss, deceased et al.
HO 4,227,106 [45] Oct. 7, 1980
[54] HIGH VOLTAGE INDUCTION MOTOR WITHOUT LADDER INSULATION BETWEEN MOTOR WINDINGS AND METHOD OF CONSTRUCTION THEREFOR
[75] Inventors: Raymond Druss, deceased, late of
Florissant, Mo., by Marian A. Druss, executrix; Glenn Hoffmeister,
Crestwood, Mo.
[73] Assignee: Emerson Electric Co., St. Louis, Mo. [21] Appl. No.: 664,060 [22] Filed. Mar. 4, 1976
[51] Int. CI.3 H02K 3/00
[52] U.S. CI 310/184; 310/194;
310/198; 310/68 C; 310/72
[58] Field of Search 310/188-208,
310/179, 180, 184, 190, 194, 68 C, 72, 214, 215;
318/221 D, 225
[56] References Cited
U.S. PATENT DOCUMENTS
2,796,543 6/1957 Dunn 310/202
2,812,459 11/1957 Smith 310/202
3,204,167 8/1965 Zigler 318/225
3,219,857 11/1965 Fisher 310/215
3,334,255 8/1957 Peters 310/215
3,633,057 1/1972 Smith 310/184
3,774,062 11/1973 Johnson 310/184
3,821,602 6/1974 Linkous 310/198
3,887,854 6/1975 Parks 310/198
3,940,646 2/1976 Buckman 318/225
FOREIGN PATENT DOCUMENTS
774187 12/1934 France 318/221
Primary Examiner—R. Skudy
Attorney, Agent, or Firm—Polster, Polster and Lucchesi
[57] ABSTRACT
A permanent split capacitor induction motor rated at 460 volts AC is provided with first and second main winding parts and an auxiliary winding. The motor includes a core of magnetic material having a plurality of winding receiving slots formed in it. The main and auxiliary windings are constructed from a plurality of wire turns arranged in coil sets. The auxiliary winding is placed adjacent the first main winding part in the core slots, and is electrically connected to it. The coil sets of the auxiliary winding are separated from the coil sets defining the second main winding part by the coil sets of the first main winding part. Individual wire turns are distributed in the slots of the motor and positioned so that the voltage between coil sets forming the main winding parts and the auxiliary winding can never exceed the voltage across the capacitor. Because of the low voltage between coil sets, the coil sets of the respective windings may be placed in the slots without the use of additional insulation between coil sets other than the insulative coating provided on the wire used for coil set construction.
7 Claims, 12 Drawing Figures
