| 摘要 |
PURPOSE:To realize accurate minute feeding by adjusting the values of the exciting currents of each phase in response to the change of the number of excitation phase and approximately making the sum of the exciting currents of each phase constant at all times. CONSTITUTION:The pulse motor has the first - the fourth winding 1a-1d, and the first - the fourth drive transistors 2a-2d wired in series with each winding are on-off controlled successively by the first - the fourth phase pulses phi1-phi4 outputted from a logical circuit 3. The first and the second constant-power source circuits 5, 6 each supply drive currents to the first and the second winding 1a, 1b and the third and the fourth winding 1c, 1d while using reference voltage outputted from a reference voltage circuit 7 as the reference. When the number of excitation phase is changed over, reference voltage changes in response to the changeover, and the values of the exciting currents of each phase are adjusted. |
