Method of stepwise speed control and three-phase squirrel-cage m

Details Method of stepwise speed control and three-phase squirrel-cage m Method of stepwise speed control and three-phase squirrel-cage m

1975-03-27

1977-07-12

Rubinson, Gene Z.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

H02P 132

Patent

active

040357015

ABSTRACT:
A method of stepwise speed control, and three-phase squirrel-cage motor, that comprises main windings connected either in a delta or in a star circuit, the main windings being connected to at least one set of additional windings that are also connected either in delta or in star. The method permits at least five different speeds of rotation without the use of a transformer.

REFERENCES:
patent: 1502909 (1924-07-01), Deflassieux
patent: 1949808 (1934-03-01), Pedrazzo
patent: 2422906 (1947-06-01), Johnson
patent: 2543131 (1951-02-01), Seifried
patent: 2763825 (1956-09-01), Gibson

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