Electromechanical device, robot, movable body, and method of manufacturing electromechanical device

1. An electromechanical device comprising:

a center shaft;

a rotor having a rotor magnet disposed around an outer periphery of the center shaft; and

a stator disposed on an outer periphery of the rotor,

wherein the center shaft is formed of a carbon-fiber-reinforced plastic, and

when projection is performed in a radial direction from the center shaft toward the rotor magnet, an angle between a direction of carbon fiber in the carbon-fiber-reinforced plastic and a direction of the center shaft is 45°.

2. The electromechanical device according to claim 1 ,

wherein the carbon-fiber-reinforced plastic of the center shaft is made by solidifying, with a resin into a cylindrical shape, woven fabric formed by plaiting flatly bundled carbon fiber bundles.

3. A robot comprising the electromechanical device according to claim 2 .

4. A movable body comprising the electromechanical according to claim 2 .

5. A robot comprising the electromechanical device according to claim 1 .

6. A movable body comprising the electromechanical according to claim 1 .

7. The movable body according to claim 6 , wherein the movable body is a vehicle.

8. A method of manufacturing an electromechanical device comprising:

forming a carbon fiber bundle using carbon fiber;

forming a woven fabric by plaiting the carbon fiber bundles;

winding the woven fabric into a cylindrical shape so that the angle between a direction of the carbon fiber of the woven fabric and a winding direction becomes 45°;

producing a center shaft by solidifying the woven fabric with a carbon-fiber-reinforced plastic;

disposing a permanent magnet around a periphery of the center shaft;

forming a rotor by molding the center shaft and the permanent magnet using a resin; and

assembling the rotor to a stator having an electromagnetic coil.