| 摘要 |
PURPOSE:To suppress torque variations, by shifting the phase angle of a conductive switching signal of a stator winding in a timer time with a timer section and by changing this time in accordance with the rotating speed of a motor. CONSTITUTION:A three-phase brushless motor 1 is composed of a rotor 2 and a stator 3 having three-phase stator windings. Its driving device is equipped with a comparison section 4, a microcomputer (control section) 10 and an output section 5-7, resistances 8-9 for reference voltage generation, the output of which is sent to input connections I1-I3 of the microcomputer 10. The output section 11 is constituted in connecting six transistors(Tr) 12-17 in a three-phase bridge, to the output terminals of which the connections U-W of the above windings are connected. With the output from the connections of the microcomputer 10 turning ON and OFF the Tr 12-17 is controlled, in which the device takes an ON/OFF combined state in six modules and the switching timing of the mode is performed by the microcomputer 10 depending on the output of the comparators 5-7. |
