| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a rotation angle detection device allowing for an offset correction at any timing to improve angle detection accuracy. <P>SOLUTION: For correcting an offset, a rotation angle detection device sets a timing when an electrical angle corresponding to a rotation angle θ becomes a predetermined angle as a timing when calculating an amplitude center value of a resolver signal ev value; preliminarily sets ratio information about a ratio for calculating a maximum value and a minimum value of the resolver signal ev based on the resolver signal ev value and the predetermined angle; determines the amplitude center value of the resolver signal ev from the maximum value and the minimum value of the resolver signal ev calculated at the calculation timing; and corrects the offset based on a deviation between the amplitude center value and the reference center value. <P>COPYRIGHT: (C)2012,JPO&INPIT |
