| 摘要 |
PROBLEM TO BE SOLVED: To provide a position detector capable of increasing the detection accuracy of rotation angle with a fewer steps.SOLUTION: In a step S103, a first voltage VHoutput from a hall element at a rotation angle of a permanent magnet is a first rotation angle &thetas;and a second voltage VHat a second rotation angle &thetas;are plugged into VH=α×&thetas;+&bgr; to calculate an inclination α and an intercept &bgr;. In a step S104, a third rotation angle &thetas;, at which the voltage output from the hall element is 0, is calculated. In a step S105, the first rotation angle &thetas;, the first voltage VH, the second rotation angle &thetas;, the second voltage VHand a calculated third rotation angle &thetas;are plugged into a VH=V×sin(&thetas;+b)+c to calculate a proper maximum voltage Vand a proper correction values b and c. In a S106, &thetas;=sin{(VH-c)/V}-b, into which the calculated proper maximum voltage Vand proper correction values b and c are plugged, is stored in a memory. With this, the detection accuracy of the rotation angle of the permanent magnet can be increased with a few steps. |
