Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1980-09-19
1983-06-07
Smith, Jr., David
Electricity: motive power systems
Induction motor systems
Primary circuit control
318797, 318817, H02P 144
Patent
active
043873308
ABSTRACT:
A single phase alternating current induction type motor is operative at more than one voltage level using the same winding circuitry. The motor has a main winding comprising two serially connected sections similarly formed and physically disposed in slots of a slotted stator core to define a number of primary magnetic poles. A second phase winding, such as a start winding, displaced in phase from the main winding sections, is connected in series with one of the main winding sections and in parallel with the other of the main winding sections. A thermistor is permanently connected in series with the start winding, the thermistor increasing in temperature in response to current flow therethrough to a preselected point where the effectiveness of the second phase winding becomes substantially less than during starting conditions regardless of the operating voltage. In addition, the first phase winding is formed such that at all rated voltage levels of operation, a generally balanced MMF pattern is produced for the primary magnetic poles, both during start and run conditions. To enhance this balance, the two winding sections of the main winding may be bifilarly wound.
REFERENCES:
patent: 2280971 (1942-04-01), Packer
patent: 2458436 (1949-01-01), Smith
patent: 2703859 (1955-03-01), Hutchins et al.
patent: 2818540 (1957-12-01), Hutchins et al.
patent: 3036255 (1962-05-01), Lewus
patent: 3068389 (1962-12-01), Cantonwine
patent: 3237072 (1966-02-01), Cantonwine
patent: 3303402 (1967-02-01), Martin
patent: 3348109 (1967-10-01), Wright
General Electric Company
Krisher, Jr. Ralph E.
Smith Jr. David
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