Reciprocating motor having controllable rotor position

摘要

To provide a reciprocation motor capable to detect rotation angle of rotor accurately. Rotor 1 is a magnet having two poles to radial direction and comprises half-cylindrical magnets. Driving coils 5a and 5b are bound equally at coil board 3. Magnetic sensor 7 is fixed at outside and under side of driving coil 5b on coil board 3. Such a construction makes magnetic sensor hard to be influenced by flux generating caused by current flowing through driving coil 5b. Therefore, it is possible to improve position detecting accuracy of rotor 1.