Variable speed controller for an induction motor

Details Variable speed controller for an induction motor Variable speed controller for an induction motor

1997-08-08

1998-10-27

Ro, Bentsu

Electricity: motive power systems

Induction motor systems

Primary circuit control

318812, 318813, H02P 7622, H02P 2100

Patent

active

058281991

ABSTRACT:
A variable speed controller for an induction motor that estimates the primary angular frequency and the speed without causing any error in the drive region where the induced voltage is low. The primary angular frequency and speed estimating device includes: a changeover signal generator that generates a changeover signal indicative of a first mode of operation when the induced voltage is greater than the changeover threshold, and a second mode of operation when the induced voltage is less than the changeover threshold; a differentiator, filter, etc., for estimating the load torque; a sample holder that holds the estimated load torque in the second mode of operation; an adder that generates the acceleration and deceleration torque; an integrator that integrates the acceleration and deceleration torque with the mechanical time constant of the induction motor to obtain the second generated speed; an adder that generates a second primary angular frequency; and an output device that in the first mode of operation outputs the first generated primary angular frequency as the reference primary angular frequency and the first generated speed as the estimated speed, and in the second mode of operation outputs the second generated primary angular frequency as the reference primary angular frequency and the second generated speed as the estimated speed.

REFERENCES:
patent: 4023083 (1977-05-01), Plunkett
patent: 5448150 (1995-09-01), Yamamoto et al.
patent: 5532570 (1996-07-01), Tajima et al.
patent: 5734251 (1998-03-01), Tajima et al.

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