System for indirectly sensing flux in an induction motor

Details System for indirectly sensing flux in an induction motor System for indirectly sensing flux in an induction motor

1981-11-25

1984-04-24

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318806, 318807, 324158MG, H02P 540

Patent

active

044450800

ABSTRACT:
Flux saturation in a current-excited induction motor is detected by sensing an accompanying increase in the level of the third harmonic in the waveform of the voltage across the stator windings. The level of the third harmonic relative to a fixed reference represents flux error. Nulling the flux error with a servo loop facilitates torque control by maintaining constant flux.

REFERENCES:
patent: 3851234 (1974-11-01), Hoffman et al.
patent: 3909687 (1975-09-01), Abbondanti
patent: 4044285 (1977-08-01), Plunkett et al.
patent: 4112339 (1978-09-01), Lipo
patent: 4137489 (1979-01-01), Lipo

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