| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To reduce effects due to a current ripple, etc. at inversion of a torque command, for example, thereby ensuring smooth drive. <P>SOLUTION: Presented here is a control apparatus for a synchronous motor including a stator which has a salient pole structure so that magnetic resistance has a level difference with respect to the needle advance direction and a needle made of a soft magnetic material, whose permanent magnet is disposed in the advance direction so as to have a magnetic polarity periodically changing in the advance direction on a plane opposed to the stator, the needle having a coil wound round it so that the magnetic polarity on the needle surface changes when current is applied to the coil. In the control apparatus, the polarity of a permanent magnet flux component on the needle surface is made to change according to the polarity of a torque command, or a weight arithmetic unit is provided in which magnet flux of the permanent magnet of the needle is calculated for a first pole pair and a second pole pair portion differing byπrad in electric angle independently of each other, and then the weights of first and second magnetic flux is calculated according to the relative positions of the stator salient and the needle and the polarity of the torque command. <P>COPYRIGHT: (C)2013,JPO&INPIT</p> |
