| 摘要 |
PURPOSE:To sharpen the rising of current and to improve the self-starting frequency by generating pulse signals with predetermined time width from the signals produced from a rotor position detector at the switching time point of the driving pulse then performing constant current amplification on said pulse signals to produce the driving signal. CONSTITUTION:Driving signal generating circuit 4 is excited at every rising and falling time point of clock pulse signal to produce the driving signals phi1, phi2 while the signal SA from the rotor position detector 1 is provided to the pulse generating circuit 2 to produce short width pulse at every switching time point of each exciting phase. Then said pulse signal is provided to the current control circuit 3 to control the drive circuit 5 to produce large exciting current having sharp rising. Since large current is supplied for predetermined time during the switching thenafter the current is reduced, the rising characteristic is improved while the power consumption is reduced. |
