Method and system for controlling induction motors

Details Method and system for controlling induction motors Method and system for controlling induction motors

1978-12-18

1981-05-12

Truhe, J. V.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318798, 318807, H02P 534, H02P 742, H02P 528, H02P 736

Patent

active

042674999

ABSTRACT:
The speed of an induction motor fed from a frequency converter is controlled by controlling the primary current by a primary current vector. To this end, a digital quantity corresponding to the slip frequency is sequentially added at a predetermined interval, and a digital quantity proportional to the angle of rotation is added to obtain a sum value. Then the primary current vector is computed from the sum value and a current component which influences only the torque to control the frequency converter. The method is suitable to be carried out with a microcomputer.

REFERENCES:
patent: 3593083 (1971-07-01), Blaschke
patent: 3700986 (1972-10-01), Cushman et al.
patent: 4023083 (1977-05-01), Plunkett
patent: 4051419 (1977-09-01), Takahashi
patent: 4088934 (1978-05-01), D'Atre et al.
Blaschke, Siemens Review XXXIX (1972), No. 5, "The Principle of Field Orientation as Applied to the New Transvektor Closed-Loop Control System for Rotating-Field Machines", pp. 217-220.

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