PURPOSE:To obtain a brushless differential synchronous machine which has a three-phase stator winding and uses two rotary transformer parts to transmit a signal by giving the same windings to two rotary transformer parts as a Scott transformer. CONSTITUTION:A primary coil middle point 2c of a rotating transformer part 2 is connected to a primary coil leading end 3a of a rotary transformer part 3 through a primary connection means 10 to constitute a Scott winding. A secondary coil middle point 2d of transformer parts 2 and 3 is connected to a secondary coil leading end 3c of the transformer part 3 through a secondary connection means 11 to constitute a Scott winding. A three-phase stator winding 7 having stator winding terminals S1 to S3 is fixed and arranged correspondingly to a rotor winding 6. Consequently, three-phase exciting signals inputted from fixed terminals R1 to R3 are transmitted to the winding 6 through transformer parts 2 and 3, and a synchronous output is obtained from the winding 7.
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