| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a position detecting device for a small rotation/linear moving-combined motor. <P>SOLUTION: This position detecting device 2 is composed of a plurality of position detecting magnets 10 and three hole elements. The magnetized directions 15 of the adjacent position detecting magnets are axially reversed each other, the first hole elements 11 is disposed to face the position detecting magnet 10, the second hole element 12 is disposed at a position rotated by 90 degrees in the circumferential direction from the position of the first hole element 11, the third hole element 13 is disposed at a position axially parted by 1/2 of the pole pitch of the position detecting magnet 10 from the position of the first hole element 11, and the rotational position θ and the direct-acting position (z) of an output shaft are calculated by θ=tan-1(V1/V2) and (z)=tan-1(V1/V3) by using the output voltages V1 to V3 of the first to third hole elements. <P>COPYRIGHT: (C)2009,JPO&INPIT |
