Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1991-09-20
1992-12-29
Witkowski, Stanley J.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318799, H02F 322
Patent
active
051754835
ABSTRACT:
In a motor speed controller for controlling an AC motor to be driven at a variable speed, a signal proportional to a load torque and a signal proportional to an output torque of the AC motor are found by current detecting means for detecting the primary current of the AC motor, and integrated over the speed changing period, and the integrated values are divided by the values corresponding to the amounts of speed change during the speed changing period so that the moment of inertia can be computed. In addition, there is provided means for changing the rate of output frequency change caused by the output frequency command into a value according to the calculated moment of inertia. Moreover, there is provided a circuit for detecting a sudden change of the calculated moment of inertia, so that when a sudden change occurs, an abnormality signal is generated.
REFERENCES:
patent: 3614566 (1971-10-01), Konig
patent: 4827197 (1989-05-01), Giebler
Fujii Hiroshi
Ibori Satoshi
Kambara Takatsugu
Nakamura Atsuhiko
Cabeca John W.
Hitachi , Ltd.
Witkowski Stanley J.
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