Magnetic gear device and rotating electrical machine

A rotating electrical machine comprising:

• an inner cylindrical portion having a cylindrical shape;
• an outer cylindrical portion having a cylindrical shape, and provided on a radially-outer side of the inner cylindrical portion and concentrically around a rotary shaft;
• and
• an intermediate cylindrical portion provided concentrically around the rotary shaft, between the inner cylindrical portion and the outer cylindrical portion, wherein
• the inner cylindrical portion serves as a rotor,
• the outer cylindrical portion serves as a winding-type stator having a plurality of coils,
• the intermediate cylindrical portion includes
• a plurality of magnetic-pole portions arranged in a circumferential direction,
• spacers having a frame shape and arranged in the circumferential direction alternately with the magnetic-pole portions, each spacer having side-wall portions contacting with the adjacent magnetic-pole portions,
• end plates provided at both ends of the magnetic-pole portions and the spacers in an axial direction of the rotary shaft, and
• reinforcement portions placed inside the spacers in a state in which each reinforcement portion is pressed to inner surfaces of the side-wall portions in the circumferential direction, so as to apply forces in the circumferential direction to the adjacent magnetic-pole portions via the spacer,
• the reinforcement portions are placed with gaps from both end portions in the axial direction of the spacers, and
• a length in the axial direction of each spacer is smaller than that of the magnetic-pole portion, and both end portions in the axial direction of each spacer are fixed to the end plates in a state in which each spacer is subjected to a tensile force in the axial direction.