Load state control for an asynchronous machine fed by a converte

Details Load state control for an asynchronous machine fed by a converte Load state control for an asynchronous machine fed by a converte

1980-05-09

1982-07-06

Pellinen, A. D.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318803, 363 47, H02P 540

Patent

active

043385591

ABSTRACT:
A control unit for regulating an asynchronous motor supplied with power from a three phase network by a line-controlled power converter which is DC coupled to a self-commutated inverter has a function generator and a current regulator which controls the stator current of the motor by the controlling rectifier valves in the inverter. Control of the stator current is a function of a predeterminable value of flux fed into the function generator. In a parallel control system, an actual-value computer and a load state control regulate the stator frequency by generating a signal for controlling the self-commutating converter as a function of the actual values of the stator current, the stator voltage, and a value calculated from the function generator input variable. The computer forms signals corresponding to the amplitude of the flux vector, and to a stator current component perpendicular to the flux vector. A variable derived from the predeterminable variable is applied to the load state control as a reference value. Fall-out-proof, low oscillation, speed control is effected from low angles to nearly 90.degree..

REFERENCES:
patent: 3796935 (1974-03-01), Blaschke
patent: 3919609 (1975-11-01), Klautschek et al.
patent: 4119893 (1978-10-01), Bayer et al.
patent: 4215304 (1980-07-01), D'Atre et al.

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