Induction motor controller

Details Induction motor controller Induction motor controller

1988-08-05

1989-12-05

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318805, H02P 540

Patent

active

048855200

ABSTRACT:
In an induction motor controller, for the amount equivalent to the secondary interlinkage flux computed by use of a component of lag of first order based on the search coil voltage or the primary voltage of the induction motor, an error with respect to the actual secondary interlinkage flux is increased in a low-speed range. However, since an estimated amount equivalent to the secondary interlinkage flux computed based on the estimated amount of the secondary interlinkage flux is also attended with the same error with respect to the secondary interlinkage flux, when the former is substracted from the latter, there only remains a term concerning the speed estimation error, which enables an estimation of the speed to be conducted also in the low-speed range. Furthermore, since the time constant of the component associated with the lag of first order is varied depending on the primary angular frequency, dumping is fixedly developed for the amount equivalent to the secondary interlinkage flux, and as a result, the speed identification characteristic is fixed regardless of the high-speed and low-speed operations of the induction motor.

REFERENCES:
patent: 3593083 (1971-07-01), Blaschke
patent: 3909687 (1975-09-01), Abbondanti
patent: 4338559 (1982-07-01), Blaschke et al.
patent: 4484128 (1984-11-01), Jotten et al.
patent: 4503375 (1985-03-01), Okuyama
patent: 4503376 (1985-03-01), Okuyama
patent: 4555755 (1985-11-01), Kurosawa et al.
Okuyama et al., "A High Performance Speed Control Scheme of Induction Motor Without Speed and Voltage Sensors," IEEE Industry Application Society Annual Meeting, pp. 106-111.

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