| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control device for a DC brushless motor suppressing the deterioration in responsiveness when detecting a rotor angle. <P>SOLUTION: An inspection voltage superposition part 21 superposes inspection voltages (Hd^, Hq^). A third adder 34 and a fourth adder 36 restrain the direction of a voltage vector composed of a differential voltage of a d-axis feedback voltage (Vd_fb) and a q-axis feedback voltage (Vq_fb) to the direction of a voltage vector composed of a differential voltage of the inspection voltages (Hd^, Hq^), and calculate a d-axis voltage (Vd) and a q-axis voltage (Vq). An angle detection means 25 calculates a sine reference value that corresponds to a sine value and a cosine reference value that corresponds to a cosine value of a double angle of a phase difference (θ-θ^) between an actual value (θ) of the rotor angle and an estimated value (θ^) of the rotor angle, by using a correction value of a modulation coefficient based on a d-axis actual current and a q-axis actual current when the inspection voltages are superposed, and the restrained d-axis feedback voltage and the restrained q-axis feedback voltage. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
