Electricity: motive power systems – Induction motor systems – Primary circuit control
Patent
1996-03-12
1998-08-18
Cabeca, John W.
Electricity: motive power systems
Induction motor systems
Primary circuit control
318807, 318799, H20P 534
Patent
active
057962375
ABSTRACT:
An efficiency control system for an induction motor system includes an induction motor, a power transducer connected to the induction motor, and a detector adapted for separate real-time detection of a voltage signal, a current signal, and a frequency signal of electric power supplied from the power transducer to the induction motor so that an output of the induction motor during operation may be controlled by these signals in response to a load torque. The efficiency control system includes an actual slip signal processor for calculating an actual slip of the induction motor during operation on the basis of a motor constant and the voltage signal, current signal, and frequency signal of the electric power supplied from the power transducer to the induction motor. The efficiency control system further includes an optimum slip signal processor for calculating an optimum slip desired to obtain the maximum efficiency of the induction motor. Additionally, the efficiency control system includes a voltage command signal transmitter for generating and transmitting a voltage command signal to the power transducer, where the voltage command signal includes a scalar value calculated by the voltage command signal transmitter. The power transducer adjusts the electrical power supplied to the induction motor in response to the scalar value of the voltage command signal such that the slip of the induction motor is maintained at the optimum value in order to operate the induction motor at the maximum efficiency for a given load torque.
REFERENCES:
patent: 4387421 (1983-06-01), Zach et al.
patent: 4450398 (1984-05-01), Bose
patent: 4785213 (1988-11-01), Satake
patent: 4823066 (1989-04-01), Yoshiki et al.
patent: 5272429 (1993-12-01), Lipo et al.
Cabeca John W.
Tajima Engineering Kabushiki Kaishya
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