Description: This article describes the controlled current source based on the subdivision number of high precision stepping motor driving method, using PwM (pulse width modulation) and 5-order Butterworth low-pass filter to achieve a double-precision 14-bit high DAc, precision controlled current source for controlling the current output, making the current flowing through the coil excitation for the stability of the DC, stepper motor to achieve a low noise, high stability of the sub-drive operation.
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