Control system for a.c. motors

Details Control system for a.c. motors Control system for a.c. motors

1977-08-30

1979-01-02

Rubinson, Gene Z.

Electricity: motive power systems

Induction motor systems

With voltage source connected to motor secondary

318700, 318799, 318809, 318766, H02P 746

Patent

active

041329317

ABSTRACT:
A control system for an a.c. motor having a polyphase primary winding (stator winding) and a corresponding polyphase secondary winding. The primary and the secondary windings are supplied with current from different frequency converters provided separately for each of the windings. The alternating currents flowing through the primary and the secondary windings are in opposite phase with each other. A position detector is provided for detecting the position of rotor of the a.c. motor. The magnitude of the primary current is controlled proportionally to a current reference signal in dependence on deviation of a speed feed-back signal from a speed reference signal, while the magnitude of the secondary current is controlled to a constant value. The phases of the primary and the secondary currents are controlled on the basis of the rotor position. The excitation frequencies for the primary and the secondary windings are set at a predetermined ratio between certain integers and a sum of these excitation frequencies is set to be equal to an angular frequency of rotating electrical angle of rotor.

REFERENCES:
patent: 3611082 (1971-10-01), Schmitz
patent: 3657622 (1972-04-01), Reuland et al.
patent: 4039909 (1977-08-01), Baker

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