Controller for induction motor

Details Controller for induction motor Controller for induction motor

1992-02-21

1993-11-23

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318807, H02D 540

Patent

active

052647730

ABSTRACT:
An error current component which becomes zero when an actual value of a primary flux coincides with a set value inducted by a product of an exciting current command and a primary self-inductance by detecting a primary current of an inductance motor, is inducted by an error current component processing circuit. A primary resistance compensation circuit processes a compensation amount of a primary resistance compensation amount. And a compensation voltage processing circuit processes a compensation voltage which directs the error current component to zero. A rotating speed of the induction motor can be controlled in a stable state even though a value of primary resistance of the induction motor is varied by temperature. Further, inadequate torque and excess current can be avoided.

REFERENCES:
patent: 3908130 (1975-09-01), Lafuze
patent: 4310791 (1982-01-01), Akamatsu
patent: 4484128 (1984-11-01), Jotten et al.
patent: 4680526 (1987-07-01), Okuyama et al.

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