| 摘要 |
PROBLEM TO BE SOLVED: To lighten the mass and lower the inertia so as to improve responsiveness as a motor, by providing a space part in a section along the extension of the pole center of the magnet with the yoke consisting of a cylinder. SOLUTION: A yoke 10 is annular in cross section, and the dimension of the diameter of a bore is set to approximately 10mmϕ, and the dimension of outside diameter to 26mmϕ, and a plurality of projections 10b, 1mm or under in width and length, are provided integrally at specified angles (60 deg.C) at the outside periphery. A slot 12 being a space part is provided just at the middle between the adjacent projections 10b. That is, it follows that the slots 12 themselves are provided plurally at specified angles (60 deg.C). Accordingly, it goes without saying that there is no influence on rotation property, inertia can be reduced since the mass of the rotor itself can be lightened, so the weight reduction as a DC brushless motor can be made, and besides the responsiveness improves, and efficient driving can be performed. |
