| 摘要 |
A method is provided for detecting a position, comprising the steps of: producing two-phase sinusoidal wave signals having a 90 DEG -spatial phase difference therebetween upon movement of a moving object; detecting the current voltage Va and Vb of the two-phase sinusoidal wave signals and calculating a value of alpha making a value of V zero, given by V=Vaxcos alpha -Vbxsin alpha ; determining the value of alpha so that polarities of sin alpha and cos alpha for the calculated alpha coincide with those of Va and Vb, respectively; and detecting a moving position of the moving object by using the value of alpha determined in the preceding step as absolute position data within 1 cycle of the 2-phase signals. According to the above method for detecting a position, the absolute position of a moving object can be detected with a high resolution. |
