Method for controlling AC induction motor

Details Method for controlling AC induction motor Method for controlling AC induction motor

1984-06-18

1990-09-18

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318805, H02P 540

Patent

active

049581163

ABSTRACT:
A method for controlling an AC induction motor in such a manner that the same degree of control as can be exerted on a DC motor is effected without requiring the use of a flux sensor or coordinate transformations. With reference to an asymmetrical-T type equivalent circuit of the AC induction motor, the input current or voltage to the stator coils of the motor is controlled so that an exciting current has a constant amplitude and continuous phase upon an abrupt change in an input torque instruction. It is demonstrated that this method produces essentially the same control as for a DC motor while methods based upon other equivalent circuits do not.

REFERENCES:
patent: 4456868 (1984-06-01), Yamamura et al.
patent: 4467262 (1984-08-01), Curtiss
patent: 4484128 (1984-11-01), Jotten et al.
Abbovdanti, A., "Method of Flux Control Induction Motors Driven by Variable Frequency, Variable Voltage Supplies" Rel. p.t.o. July 6, 1981.
Blaschke, Felix, "The Principle of Field Orientation as Applied to the New Transvektor Closed-Loop Control System for Rotating-Field Machines," Siemens Review, vol. XXXIX, No. 5, pp. 217-220, (1972).
Yamamura, S. and Nakagawa, S., "Equivalent Circuit and Field Acceleration Method of A-C Servomotor by Means of Induction Motor," Trans. B., IEEE of Japan, vol. 102-B, p. 439 (1982).

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