Patent ID: 6643606
Filing Date: 2003-11-04
Classification: G01D

Abstract:
An apparatus for measuring an absolute rotation angle, comprising:a rotation mechanism having a driver rotating unit connected to a resolver, and including a projection piece attached to a side of said driver rotating unit, said rotation mechanism further having a driver fixing unit, rotationally coupled to said driver rotating unit and a sensor for detecting a rotating state of said driver rotating unit; said sensor being fixedly attached to a portion where said driver fixing unit is fixed for detecting a passage of said projection piece; an actuator unit for driving said rotation mechanism in response to a rotation control signal; a resolver interface for converting a rotation detection signal from the resolver to a digital resolver data; and a controller for providing said rotation control signal to said actuator unit, for receiving said digital resolver data and the rotation detection signal to set an initial rotation reference position of said rotation mechanism, and for calculating said absolute rotation angle when the digital resolver data changes.