Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1984-01-04
1985-03-05
Duggan, Donovan F.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318730, 318827, 318832, 310112, 310166, H02P 534
Patent
active
045033773
ABSTRACT:
A variable speed rotary electric machine comprises a stator composed of a stator core and first and second stator windings wound on the stator core, and a cage rotor mounted rotatably within the stator and composed of a rotor core and rotor conductor disposed in a squirrel-cage configuration. The first stator winding is connected to an AC power supply of a fixed frequency. The second stator winding is connected to a power supply of a variable frequency. The first and second stator windings are so wound as to form, respectively, numbers of poles differing from each other. The rotor conductors of the cage rotor are electromagnetically coupled with the magnetic flux generated by the first and second stator windings, respectively, and so disposed as to form a number of poles which is intermediate between the number of the poles formed by the first stator winding and the number of poles formed by said second stator winding.
REFERENCES:
patent: 1617394 (1927-02-01), Japolsky et al.
patent: 2280456 (1942-04-01), Stevens et al.
patent: 2573283 (1951-10-01), Seitz
patent: 2808552 (1957-10-01), Voege
patent: 2845588 (1958-07-01), Sampietro
patent: 2896143 (1959-07-01), Bekey
patent: 4039910 (1977-08-01), Chirgwin
patent: 4143309 (1979-03-01), Patterson
Kitabayashi Yukio
Okuyama Toshiaki
Takahashi Noriyoshi
Tanaka Yoji
Watanabe Masatoshi
Duggan Donovan F.
Hitachi , Ltd.
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