| 摘要 |
PURPOSE:To prevent an excess heating from generating or a dynamic character istic at starting or stopping time from decreasing by switching 1-2-phase excita tion and 2-phase excitation corresponding to a speed range. CONSTITUTION:A speed is designated by a speed instructing circuit 11, this is discriminated by a speed discriminator 12 whether it is in low or high speed range, and a signal for designating either one is fed to a 1-2-phase exciter 13 and a 2-phase exciter 14. The combination of exciting phases is selected by a select control signal from the discriminator 12, and temporarily held in 1-2-phase/2-phase selector 15. This content is fed as a phase excitation signal to the input side of each phase drive element of a motor driver 16. A motor excitation signal from each phase driver element is supplied to the phase excit ing coil of a pulse motor 10 supplied with the power source voltage Vcc. |
