| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor driver system adjusting a spark advance with ease and precision by electrically adjusting a spark advance without changing a mounting position of a hall element and expressing a relationship with a control voltage for adjusting a spark advance from the outside with a relatively simple relation equation. <P>SOLUTION: In this motor driver system, each hall signal voltage output from the hole elements 31 to 33 of a motor 12 is amplified by reference Gm amplifiers 21 to 23 (fixing gain) and spark advance Gm amplifiers 24 to 26 (variable gain). From the reference Gm amplifiers 21 to 23, current signals Ia, Ia', Ia'' are outputted and, from the spark advance Gm amplifiers 24 to 26, current signals Ib, Ib', Ib'' are outputted. A wave synthesizer 14 generates a three-phase current signal having a phase advance by generating a difference current between currents having different phases among Ia to Ia'' and Ib to Ib''. A spark advance α of the three-phase current signal is adjusted by changing the gain of the spark advance Gm amplifier. <P>COPYRIGHT: (C)2009,JPO&INPIT |
