| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an apparatus which performs detection without troubles, has smaller overall dimensions and is low lost, and codes rotation parameters, and an anti-friction bearing and an electric motor having this apparatus. <P>SOLUTION: This apparatus is used for coding the rotation parameters of a rotation element, having a multi-track coder and has one code track 5 having a multi-pole magnetic ring, and its each code track has at least one coding element; and at least one code track 4 in the apparatus, has series of dead space portions 6 and wall portions 7, formed in a radial wall 3b made of a ferromagnetic material. <P>COPYRIGHT: (C)2004,JPO&NCIPI</p> |
