Method and apparatus for preventing a current collapse in a phas

Details Method and apparatus for preventing a current collapse in a phas Method and apparatus for preventing a current collapse in a phas

1988-10-17

1991-04-09

Smith, Jr., David

Electricity: motive power systems

Synchronous motor systems

Armature winding circuits

H02P 540, H02K 1910

Patent

active

050067753

ABSTRACT:
A method and apparatus for preventing a current collapse in a phase not participating in the commutation, of a three-phase block current supplied synchronous machine, while the phase currents of the other two phases are being commutated. A control voltage controlling the synchronous machine is acted upon during the commutation of two phase currents by an additional control voltage such that the average of current drop in the down-commutating phase is equal to the average of the negative current rise in the up-commutating phase. Thus, a method and a circuit arrangement for carrying out this method are obtained with which the torque oscillations of a three-phase-feed drive can be reduced substantially.

REFERENCES:
patent: 4112339 (1978-09-01), Lipo
patent: 4137489 (1979-01-01), Lipo
patent: 4172991 (1979-10-01), Akamatsu et al.
patent: 4240020 (1980-12-01), Okuyama et al.
patent: 4565956 (1986-01-01), Zimmermann et al.
patent: 4777414 (1988-10-01), Storath et al.

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