DIRECT ACTING ROTATION ACTUATOR

A direct acting rotation actuator includes a motor unit, an output shaft, a detector unit, and a bearing portion. The motor unit includes a field magnet portion which includes a permanent magnet or a core tooth, a first armature winding which generates a rotation magnetic field in the rotation direction, and a second armature winding which generates a traveling magnetic field in the direct acting direction. The output shaft is attached to the field magnet portion of the motor unit. The detector unit includes a direct acting detector and a rotation detector respectively detecting a position in the direct acting direction and an angle in the rotation direction of the output shaft. The bearing portion includes a direct acting bearing and a rotation bearing respectively supporting the output shaft in the direct acting direction and the rotation direction. The motor unit is disposed on an anti-load side of the output shaft, and the detector unit is disposed on a load side of the output shaft.