| 摘要 |
Driving circuit improves voltage unbalancing problem like wave- form distortion due to the offset characteristics of HALL sensors as many as the number of phase. The idea is to remove Hall sensors, to add more sensing coil (L1-L3) around the stator and to amplify (OP1-OP3) voltage induced in the coil, which drives motor by switching mostransistors (FET 2-6) and (D1-D3) while solving the old problem. The other important configarations are sawtoothed wave voltage generation circuit (UJT, R1-R4, C1) when starting, frequency generation pro-portional (Q1-Q3, R5, C2, TM) to gene rated sawtooth voltage, wareform generation proper to motor(M).
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