H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/96
H02P 23/00 (2006.01) H02P 21/08 (2006.01)
Patent
CA 1207379
ABSTRACT Disclosed is a flux-feed-forward induction motor controller in which the parameters controlled are motor current and slip frequency. In known controllers of this type, the controller structure is essentially a network which is an accurate inverse of the transfer function of the induction motor being controlled. The present invention, however, provides a motor controller circuit which differs from the inverse of the motor circuit. Briefly, the present invention generates a motor slip frequency value and two current magnitude values representing guadrature components of the motor stator current to be generated. Closed-loop control of the motor operation is provided by feeding back a signal representative of the motor shaft speed or position to a circuit which compares this signal with an input command to calculate the torque required from the motor. The feedback signal is separated into high and low frequency components and additional circuitry changes the value of motor torque input parameter in response to detected variations in the high frequency components of the feedback signal. This causes the motor control circuit to no longer represent the inverse of the motor transfer function network. The motor controller of the pre- sent invention achieves a significantly increased bandwidth compared to the bandwidth which would be achieved without the additional circuitry. Where the motor is controlled by a digital control system, the invention allows a major improvement in bandwidth of the motor controller without requiring a high throughput of data processed by the digital portion of the controller.
436107
Comstock Robert H.
Fulton Donald E.
Imec Corporation
Smart & Biggar
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