| 摘要 |
PURPOSE:To achieve smooth operation from start to high speed operation and to carry out speed control in the range from high speed to low speed, by comparing a position detecting signal fed from a Hall sensor with a phase control sensor. CONSTITUTION:A poly-phase rectangular wave oscillator 16 controls the oscillation frequency of a poly-phase rectangular wave according to a frequency control signal fed from a frequency regulating circuit 14. A power conduction phase regulating circuit 20 outputs a phase control signal according to the frequency control signal. A power conduction phase operating circuit 18 controls the phase of the poly-phase rectangular wave according to the phase control signal. A Hall sensor for detecting the position of a rotor is arranged on a stator box, and the power conduction phase operating circuit 18 compares a position detecting signal fed from the Hall sensor with the phase control signal fed from the power conduction regulating circuit 20 and carries out current control accurately. |
