| 摘要 |
PURPOSE:To improve mass productivity by making a substrate for a magnetic resistance effect element part small and forming the magnetic resistance effect element on the substrate in a unitary body, to improve the arranging accuracy of the magnetic resistance element, and also to eliminate the mutual magnetic interface between encoder parts and position detecting parts. CONSTITUTION:A magnetic body attaching part and the magnetic resistance effect element (MR element) part are divided into encoder parts and position detecting parts, respectively. The position detecting parts of the magnetic body attaching part D are subdivided in correspondence with the phase number of a brushless motor. The directions of the magnetic recording of detecting tracks 40-43 are made different. The MR elements 61-63 for the first - third phases are arranged so as to face the detecting tracks associated with the magnetic bodies approximately linearly. The directions of the magnetic signal recording of the encoder parts and the position detecting parts are made to intersect at a right angle. Namely arrangement is sequentially made in the circumferential direction and at the inside and outside of the radial direction. Thus the mutual interference between magnetic recording can be eliminated. The magnetic signal recording N and S in each detecting track at the position detecting part are arranged so that the direction in each track is reversed with respect to the direction in the other track. Therefore the magnetic interference between each of the detecting tracks can be decreased. |
