Method and circuit for the derivation of an analog slip frequenc

Details Method and circuit for the derivation of an analog slip frequenc Method and circuit for the derivation of an analog slip frequenc

1974-10-03

1976-11-02

Rubinson, Gene Z.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

H02P 742

Patent

active

039899918

ABSTRACT:
A tachometerless motor drive of the induction motor type is obtained by synthesizing the motor slip frequency from analog signals sensed at the input of the motor. The slip frequency signal so derived is used as one of the parameters for control, beside voltage and/or frequency or current and frequency at the input of the motor.
Analog circuitry is used involving the derivation of a numerator N characteristic of E.sub.1 I.sub.1 Cos .theta., where E.sub.1, I.sub.1 and .theta..sub.1 are given by the vectorial representation of the input current and voltage, and of a denominator D = E.sub.1.sup.2 /.omega..sub.1
where .omega..sub.1 is the frequency of the motor supply.

REFERENCES:
patent: 3500158 (1970-03-01), Landau et al.
patent: 3512067 (1970-05-01), Landau
patent: 3593083 (1971-07-01), Blaschke
patent: 3718847 (1973-02-01), Graf et al.
patent: 3775652 (1973-11-01), Bowler et al.
patent: 3824437 (1974-07-01), Blaschke

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