| 摘要 |
PURPOSE:To obtain a motor driving circuit having predetermined performance with a simple structure by applying a pulse voltage to a coil corresponding to a plurality of phases of pulse signals synchronized with a pulse signal of first pulse rate. CONSTITUTION:A CPU generates a pulse signal SCLK of first pulse rate. A phase signal generator(PHG) 4 generates a plurality of phases of pulse signals synchronized with the pulse signal of the CPU. On the other hand, a pulse voltage generator 3 generates a pulse voltage of second pulse rate larger than the first pulse rate. A switching driver(SDR) 5 applies the pulse voltage of the generator 3 to corresponding motor coils according to the pulse signals of the phases of the generator(PHG) 4. Desirably, the CPU varies the first pulse rate. Thus, lower power, low heat generation, etc., are performed with a simple structure without chopper driving. |
