C.c.m. Beheer B.v.

Eugenio J Smits

Lodewijk J Offringa

Control circuit for semiconductor components of a converter circuit which can be switched on and off to convert direct current into three-phase current. The converter circuit is connected between a direct-current source and the stator of a synchronous machine having a cylindrical rotor. The control circuit measures rotor position and the direct current and determines from the obtained signals the value of the commutation angle .mu. of the phase current i in the converter at any value of the direct current I.sub.d on the basis of a model of the synchronous machine which solely takes account of the fundamental harmonic of the phase current i, the firing angle .alpha. of the semiconductor components being set between limits determined for any value of the direct current I.sub.d by the associated commutation angle .mu..

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Nuenen, Netherlands

Eugenio J Smits