| 摘要 |
PURPOSE:To enable a motor of less cogging to be produced with high productivity, by a method wherein a face confronting a salient pole is notched between magnetized areas of a ring-formed magnet, and wherein a slightly magnetized intermediate area is provided. CONSTITUTION:A ring-formed magnet 2 is magnetized with poles N 21 and poles S 22 alternately at the same width in the circumferential direction, and intermediate areas 23 are arranged respectively between the magnetized areas 21 and 22. The intermediate areas 23 are arranged essentially to have the same width, and notched sections 24 are provided for sections confronting salient poles 11, and the intermediate areas 23 are arranged to be magnetized with magnetic intensity equal to or less than that in the magnetized areas 21, 22. As the result, non-magnetized areas can be easily formed on the ring-formed magnet 1, and a motor of less cogging and large torque generation can be easily produced. |
