Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1987-03-09
1988-09-20
Shoop, Jr., William M.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318797, H02P 126
Patent
active
047728426
ABSTRACT:
A substantial reduction in required startup current is obtained in a drive arrangement with a three phase motor in that the stator winding of the motor comprises more than two winding legs per phase, all the winding legs of one phase being arranged in identical slots. During running up to speed of the motor, the more than two winding legs of each phase are wired symmetrically and are connected to the network in such a way that the magnetic fields produced by at least two winding legs per phase cancel each other out and only the remaining winding legs produce a rotating field.
REFERENCES:
patent: 2182646 (1938-07-01), Shutt
patent: 3949254 (1976-04-01), Woll, et al.
patent: 4035701 (1977-07-01), Jensen
patent: 4352051 (1982-09-01), Johnson
patent: 4387330 (1983-06-01), Zigler
patent: 4417192 (1983-11-01), Ghosh
patent: 4446415 (1984-05-01), Taylor et al.
patent: 4675591 (1987-06-01), Pleiss
Anlaufschaltungen bei Asynchron-und Synchronmaschinen ohne Stromunterbrechung by V. J. Tittel, The German Magazine E&M, 1961, pp. 163-170.
Japanese Abstract 54-129306, Hitachi Seisakusho Three Phase Induction Motors.
Jap. Abs. 56-110484, Shinko Denki, Delta Double-Star Starting Method for 3 Phase Squirrel Cage Indust. Mtr.
Shoop Jr. William M.
Siemens Aktiengesellschaft
Young Brian K.
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