| 摘要 |
PURPOSE:To prevent the increase of cogging and torque ripple by diving a magnetic pattern for generation of torque and detection of rotating magnetic field generating timing equally, excluding the boundary of one place, and inclining the boundary of its one place in circumferential direction within the face vertical to the radial direction, centering on the position where it is to be divided equally. CONSTITUTION:The magnet 2 for magnetic field generation of an electromagnetic rotating machine is made a cylindrical permanent magnet. And, its magnetic pattern is used both for generation of torque and for detection of rotating magnetic field timing, and it is divided equally in circumferential direction, excluding the boundary of one place, and the boundary of one place is made an inclined boundary being inclined in circumferential direction within the face vertical to the radial direction to the face in radial direction including the rotary shaft, centering on the position 201 where it is to be divided equally. Accordingly, since a yoke is positioned at the center of the magnet 2, the magnetic divisions 203 and 204 on both sides of the inclined boundary 202 react upon them equally to the other boundaries, and also a Hall element 4 reacts greatly upon either an N pole or an S pole thereby generating a timing signal. |
