To provide a variable field motor that can reduce eddy current loss generated in a field yoke due to an alternating current flowing through a three-phase winding.SOLUTION: A variable field motor 10 includes a rotatable shaft 12, a cylindrical rotor core 14 fixed to a shaft 12, a cylindrical stator core 20 provided on the outer peripheral side of the rotor core 14, a stator coil 22 having a three-phase winding 24 wound around the stator core 20, a field yoke 30 provided on the outer peripheral side and the side surface side of the stator core 20, and a field coil 38 that can control the magnetic flux density between the rotor core 14 and the stator core 20 by forming a magnetic circuit between the field yoke 30 and the rotor core 14. The field yoke 30 has one or more through holes 40 or notches into which the windings 24 are inserted, and in each of the through holes 40 or the notches, the sum of the currents of the inserted windings 24 is zero.SELECTED DRAWING: Figure 1