| 摘要 |
PURPOSE:To decrease the change of the current of a stepping motor, improve the accuracy of the apparatus, make its size smaller and lower its cost by connecting a phase conversion means for mutually opposite phase operation of the choppers of current control circuits between an oscillation circuit and either of the current control circuits. CONSTITUTION:A phase conversion means 20 consisting of an inverter is connected between either of current control circuits 10A and 10B and a common excitation circuit 11. Therefore, a clock signal phiA from the excitation circuit 11 is converted into a clock signal phiB of the reverse phase. Hence the choppers of the current control circuits 10A and 10B are operated in phases opposite to each other. Therefore, a current I flowing through a stepping motor 1 is changed little. |
