The commutatorless motor (CLM) consists thyristor inverter and a three phase synchronous motor which has a position sensoe its shaft. As the commutation of thyristors are performed by the armature induced voltage, construction of CLM is brief, that is, it needs not external commutation equipments such as capacitors and reactors. Outline of the paper is as follow: (1) Influence of the series characteristics of CLM by saliency and shortcircuit ratio. (2) Expantion of the commutation limit of thyristors by using compensating winding. (3) Influence of the characteristics of CLM by smoothing reactor.
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