| 摘要 |
PROBLEM TO BE SOLVED: To make it possible to cope with a variety of output position detection patterns by detecting the tip end or rear end is rotating direction of a ring- shaped magnet by a detection element and then outputting ON or OFF signals. SOLUTION: A ring-shaped magnet 16 is used; the magnetizing angle (portion shown dark) of the magnet 16 is set to 120 deg., and these Hall ICs 9a and 9b are arranged to the angle positions of 0 degree and 80 degrees by using only two Hall ICs 9a, 9b as detection elements. With this construction, when a motor actuator is driven, Hall IC 9a turns ON when the output shaft is 0 degree, and the Hall IC 9b remains in OFF state. Next, when the output shaft rotates to the position of 80 degrees, the Hall IC 9a remains in off state, and the Hall IC 9b is set from OFF to ON. Moreover, if the output shaft rotates to the position of 120 deg., the Hall IC 9a is set from ON to OFF, and the Hall IC 9b remains in ON state. |
