| 摘要 |
PURPOSE:To reduce the excess torque by providing variable current supplying means having a frequency-voltage converter and a current supply circuit and controlling to equalize the output torque of a step motor to the torque necessary for a load. CONSTITUTION:A signal from a pulse generator 11 is fed to a drive circuit 12 and a frequency/voltage converter 13 to obtain an output of the total voltage value of the pulse signals inputted during the prescribed period from the converter 13 as voltage information, applied to a current supplying circuit 14 to control the circuit 12, thereby driving a step motor 3. Accordingly, when the output of the converter 13 is high voltage signal, a large current is applied to the circuit 12, and when it is low voltage signal, a small current is applied to the circuit 12 to drive the motor 3 with the same frequency as the generator 11, thereby equalizing the torque of the motor 3 to the torque necessary for a load 4, and preventing the noise caused by the excess torque or decrease in the accuracy. |
