| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce the number of wires between a motor and a control board in a motor controller. <P>SOLUTION: A negative polarity three terminal regulator 27 generates a constant power supply voltage Vs from a power supply voltage Vcc and supplies it to Hall sensors 3u, 3v and 3w through power supply lines 2a and 2b. Output terminals of the Hall sensors 3u, 3v and 3w are pulled up to the power supply line 2a through resistors 25u, 25v and 25w, and their resistances have a relation Ru:Rv:Rw=1:2:4. A current Is dependent on the output signals Hu, Hv and Hw from the Hall sensors 3u, 3v and 3w flows through the power supply lines 2a and 2b, and a rotary position of a rotor 22r is determined by a microcomputer 30 based on an A/D conversion value of a voltage Vx generated in a resistor 28. <P>COPYRIGHT: (C)2009,JPO&INPIT |
