Variable speed induction motor

Details Variable speed induction motor Variable speed induction motor

1975-05-12

1977-04-19

Hickey, Robert J.

Electricity: motive power systems

With flywheel or massive rotary member

310113, 318197, 318237, H02P 736, H02K 1724

Patent

active

040191044

ABSTRACT:
A polyphase motor of the wound rotor type has the rotor of a polyphase generator, smaller in size than said motor, mounted on the motor shaft. Polyphase voltages produced across the generator rotor are coupled to the input of an amplifier having an output power commensurate with the size of the motor and the amplifier output is connected to the windings of the motor rotor to supply the current to the motor rotor windings. The frequency of the voltage fed to the motor rotor is inversely proportional to the motor speed, and a frequency sensitive filter is provided to adjust the output of the amplifier thereby to control the motor speed and to maintain said speed at a selected predetermined value regardless of the motor load.

REFERENCES:
patent: 2236984 (1941-04-01), Alexanderson
patent: 2703862 (1955-03-01), Gordon
patent: 3290574 (1966-12-01), Roe
patent: 3549968 (1970-12-01), Shibata

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