Method and apparatus for determining the resistance of an AC mot

Details Method and apparatus for determining the resistance of an AC mot Method and apparatus for determining the resistance of an AC mot

1983-05-11

1984-05-29

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Braking

318798, 318806, H02P 318

Patent

active

044517700

ABSTRACT:
A scheme for determining the stator resistance of an alternating current motor includes the determination of the actual flux of the motor through the sensing of motor voltage and motor current. The motor current is also utilized to develop a signal representing the anticipated motor flux which will result from that current. These two flux signals are combined to develop a flux error signal, the polarity of which is determined by whether the motor is in the motoring or regenerative mode of operation, which in turn is integrated to give the signal representing the motor stator resistance. Additionally, when the motor changes mode of operation, there is provided a step function which assures a motor stator resistance value being used which insures control stability.

REFERENCES:
patent: 4023083 (1977-10-01), Plunkett
patent: 4245181 (1981-01-01), Plunkett
patent: 4282473 (1981-08-01), Dreiseitl et al.

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