| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a small and accurate position detecting device and a rotary linear motion motor. <P>SOLUTION: The position detecting device of the rotary linear motion motor comprises a permanent magnet 15 in a truncated cone shape fixed to a motor shaft 16, and a magnetic field detecting element 14 attached to a fixed body 13, wherein the two magnetic field detecting elements 14 are arranged in a rotating direction so that two signals having a phase difference of 90 degrees electrically can be obtained, magnetic flux density detected by the magnetic field detecting element 14 varies as a sine wave in a circumferential direction, and amplitude of the magnetic flux density linearly varies in a linear motion direction regarding a position, and a rotating angle θ and a linear motion position (z) of the motor shaft can be calculated from an output signal V1 of a first magnetic field detecting element 141 and an output signal V2 of a second magnetic field detecting element 142. <P>COPYRIGHT: (C)2010,JPO&INPIT |
