| 摘要 |
PURPOSE:To detect the position of revolution of a body of revolution precisely by providing a position detecting circuit filter characteristics having no phase change in a working frequency region. CONSTITUTION:A stator for a resolver 25 is excited by voltage corresponding to a reference signal Ref outputted from a reference counter circuit 22. Output voltage Vo from the resolver 25 is inputted to a position detecting circuit 31, and converter into a position detecting signal Si by a filter circuit 26 having characteristics having zero phase change in a working frequency region. The position detecting signal Si is inputted to one-shot circuit 28 through a waveform shaping circuit 27, and a pulse signal Sb synchronizing with a clock signal phi1 is outputted. A count signal Kb from the reference counter circuit 22 at a time when the pulse signal Sb is outputted is outputted as the angle of rotation thetaf. |
