To provide a synchronous motor having a feature capable of performing high-efficiency operation, and a motor control device therefor, related to the synchronous type motor of a permanent magnet field type and a control system equipped with the motor and an inverter.

In the motor having a plurality of salient magnetic poles having armature windings and a plurality of field magnetic poles, the motor is characterized in that the first armature winding or the second armature winding is wound around each salient magnetic pole, and a combination rate of the number of salient magnetic poles of a winding group of first armature windings and the number of salient magnetic poles of a winding group of second armature windings is set to be 2:1. As for the motor, the motor of the permanent magnet field type can be provided in which the disclosed slot combination of he number of salient magnetic poles and the number of field magnetic poles has achievd reduction of the cogging torque.