Device for speed control of an asynchronous motor

Details Device for speed control of an asynchronous motor Device for speed control of an asynchronous motor

1988-06-10

1990-03-13

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

H02P 540

Patent

active

049085646

ABSTRACT:
The properties synchronous motors are provided to an asynchronous motor fed with the aid of a digital speed control via a static converter. For this purpose, a signal proportional to an integral of the rotation-speed deviation, and a signal corresponding to the rotation-speed set-point value, are multiplied with each other and therefrom is obtained the control-pulse sequence for the converter. From an input sequence corresponding to the measured rotation speed, a signal corresponding to the period duration of the rotation-speed measurement-device frequency is obtained, and this signal is divided by a value corresponding to the rotation-speed set-point value. The period-duration signal referring to the rotation-speed set-point value thus obtained is switched opposite to the control-deviation signal, before the control-deviation signal is fed to the multiplier.

REFERENCES:
patent: 4327315 (1982-04-01), Kawada et al.
patent: 4330741 (1982-06-01), Nagase et al.

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