| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a highly reliable brushless DC motor ensuring highly efficient operation constantly with low noise regardless of the variation of a load or duty control. <P>SOLUTION: The variation of a load is detected from a voltage V0 generated at a resistor 5, the determinative element of a duty control value Du, i.e., a command r.p.m., is monitored and then the phase angle of each driving signal is set variably (to an optimal value) depending on results of detection and monitoring. <P>COPYRIGHT: (C)2003,JPO |
