| 摘要 |
PURPOSE:To use a power supply of comparatively high voltage and increase service power sufficiently by making currents flowing through each winding of a stepping motor constant. CONSTITUTION:Each collector of the first transistors 5a, 5b, 5c, 5d is connected to each phase winding 3a, 3b, 3c, 3d of a stepping motor 1 through diodes 6a, 6b, 6c, 6d for preventing crosscurrents. Resistors 7a, 7b, 7c, 7d are connected among the emitters and grounds of each first transistor, and the both end voltage of the resistors 7a, 7b, 7c, 7d is inputted to the bases of the second transistors 10a, 10b, 10c, 10d. The second transistors 10a, 10b, 10c, 10d detect the both end voltage of the resistors 7a, 7b, 7c, 7d, control the base currents of the first transistors 5a, 5b, 5c, 5d and make currents flowing through each phase winding constant. Thus, comparatively high voltage can be used as a power supply+E2, and service power can be increased sufficiently. |
