Induction motor control apparatus providing high efficiency with

Details Induction motor control apparatus providing high efficiency with Induction motor control apparatus providing high efficiency with

1994-06-15

1995-08-15

Martin, David S.

Electricity: motive power systems

Induction motor systems

Power-factor control

318803, 318811, H02P 540

Patent

active

054422710

ABSTRACT:
An induction motor control apparatus, for converting an AC power supply voltage to a motor supply voltage for an induction motor, includes a feedback control loop for controlling the level of the motor supply voltage such that the induction motor operates close to a predetermined value of power factor, and also includes circuits for deriving a signal which varies in accordance with the motor admittance (or impedance), and for differentiating that signal to obtain a parameter variation signal which indicates an amount and direction of any sudden change in the motor load torque. The parameter variation signal is applied to the control loop such as to immediately increase or decrease the motor supply voltage, as required, when any sudden change in load occurs, thereby ensuring rapid control response together with stability of control.

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patent: 5204606 (1993-04-01), Kuwahara et al.
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