| 摘要 |
PURPOSE:To obtain a miniature motor generating output according to the rotational frequency, by magnetizing the wedge for each slot. CONSTITUTION:A plurality of wedges 12 made of magnetic substance are fixed in the slots 11 of a rotor core 6 with adhesives, varnish or the like so that the wedges on the outer circumferential side 12a may be arranged with the same polarities. When a rotary shaft 8 is rotated, then the wedges 12 which are fixed in the slots 11 of the rotor core 6 and are magnetized are also rotated, and so the signal according to the rotational frequency can be obtained from a magnetic detecting element 13 confronting the rotor core 6. |
