Continuous pole amplitude modulated electric machines

Details Continuous pole amplitude modulated electric machines Continuous pole amplitude modulated electric machines

1983-03-24

1984-10-16

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318771, 318776, H02P 748

Patent

active

044777604

ABSTRACT:
A pole amplitude modulated electric machine is operated at continuously variable speeds between fixed limits by a control circuit which rapidly switches the stator winding between the upper and lower pole number configurations. The switching is controlled such that the stator winding remains in each configuration for a time which exceeds the cycle time of an external power source but is less than the combined magnetization-rotor loop time constant of the machine. Phase control of the switching can be used to control speed in the vicinity of the fixed limits. In all cases, the input power frequency remains constant.

REFERENCES:
patent: 1712237 (1929-05-01), Weichsel
patent: 3876923 (1975-04-01), Humphrey et al.
patent: 3925688 (1975-12-01), Kalfus
patent: 4070605 (1978-01-01), Hoeppner
patent: 4313075 (1982-01-01), Stewart et al.
patent: 4413218 (1983-11-01), Taylor et al.

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