Elevator speed sensorless variable voltage variable frequency in

Details Elevator speed sensorless variable voltage variable frequency in Elevator speed sensorless variable voltage variable frequency in

1992-06-15

1994-06-28

Shoop, Jr., William M.

Electricity: motive power systems

Induction motor systems

Primary circuit control

318807, 187116, 187119, B66B 130, H02P 540

Patent

active

053250362

ABSTRACT:
During motor jerk-out, the real component of a stator current ReI is measured as an approximation to torque current I.sub.T, and a reference acceleration A.sub.ref is obtained as an approximation to the motor acceleration, for providing, by means of linear regression, the Y intercept of a line defining the relationship between ReI and A.sub.ref, which intercept defines ReI at a constant high speed (ReI.sub.CONSTANT HIGH SPEED) for linearly relating ReI.sub.CONSTANT HIGH SPEED to a compensation frequency f.sub.comp, which is provided to a summer for summing f.sub.comp with a reference frequency f.sub.ref used for dictating motor speed. The stator current I and A.sub.ref are sampled during jerk-out when the motor is at high speed because there the real component of the stator current ReI is approximately equal to I.sub.T.

REFERENCES:
patent: 3619750 (1971-11-01), Mokrytzki
patent: 4418308 (1983-11-01), Bose
patent: 4726450 (1988-02-01), Fossati et al.
patent: 4751984 (1988-06-01), Williams et al.
patent: 4958117 (1990-09-01), Kerkman et al.
patent: 4982816 (1991-01-01), Doi et al.
patent: 5035301 (1991-07-01), Skalski

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