Torque controller for an AC motor drive and AC motor drive embod

Details Torque controller for an AC motor drive and AC motor drive embod Torque controller for an AC motor drive and AC motor drive embod

1985-06-18

1987-06-09

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, 318807, 324158MG, H02P 540

Patent

active

046722882

ABSTRACT:
In an induction motor drive a signal representative of the torque T as derived by sensing only the stator armature current I, and the slip frequency f.sub.2 and by calculating instantaneously T=I.sub.1.sup.2 F, where F is a function of f.sub.2 /R.sub.2, where R.sub.2 is the rotor resistance of the motor. The value of R.sub.2 is adjusted to match temperature by generally two alternative methods: (1) measuring the stator temperature, relying on the change of resistance R.sub.1, known experimentally, and applying an equivalent change for the rotor resistance R.sub.2 ; (2) by running the motor at rated speed and determining experimentally R.sub.2 /f.sub.2 as a function of F.

REFERENCES:
patent: 4330741 (1982-05-01), Nagase et al.
patent: 4418308 (1983-11-01), Bose
patent: 4456868 (1984-06-01), Yamamura et al.
patent: 4484128 (1984-11-01), Jotten et al.
patent: 4510430 (1985-04-01), Ashikaga et al.
patent: 4567419 (1986-01-01), Watanabe

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