| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an apparatus for controlling a motor which can realize a rotating position detection using a resolver with a constitution having a low cost and good controlling response. <P>SOLUTION: A microcomputer 21 outputs a clock signal S1 having a period of double as large as a conveying period in a PWM modulation. A synchronous excitation signal forming circuit 11 forms a sine wave-like excitation signal S2 by low-pass filtering the clock signal S1. And, when the microcomputer 21 performs A/D conversion by synchronizing a cosine signal S3 and a sine signal S4 outputted by the resolver 2 disposed in the motor 1 with a carrier period, cosine data Dx and sine data Dy are obtained as a difference of the continuous twice A/D conversion results, and the rotary position Θ of a rotor is calculated by using a function arctan. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
