| 摘要 |
PROBLEM TO BE SOLVED: To suppress cogging torque and to improve run-out accuracy.SOLUTION: In a direct drive motor, a spigot surface is provided to an outer ring presser with respect to a rotor to enhance concentricity between the rotor and the outer ring presser. It is preferable that a spigot surface be provided to an inner ring presser with respect to an inner housing to enhance concentricity between the inner housing and the inner ring presser. It is preferable that a spigot surface be provided to the rotor with respect to a bearing to enhance concentricity between a bearing rotation center and the rotor by fitting. It is preferable that magnets be disposed on a concentric circle with a rotor shaft core. It is preferable that a spigot surface be provided to the inner housing with respect to the bearing to enhance concentricity between the bearing rotation center and the inner housing by fitting. It is preferable that tooth leading ends of the inner housing be disposed on a concentric circle with the inner housing shaft core. It is preferable that the bearing be one. It is preferable that the direct drive motor be an outward rotation type. |
