More radical solutions, need to know the harmonic source in where? The frequency of harmonic? This need professional auxiliary instrument, it is best to power quality analyzer, or a spectrum analyzer to measure. After know the harmonic source and the interference spectrum, was done. Still have a kind of passive solution, that is, on the power of the stepper motor drives with step step dedicated special filter, reactor, zero phase reactor, filter, isolation transformer magnetic ring, and so on. And, of course, there are more troublesome, increase the wire diameter of stepper motor drives, stepper motor drives grounding (Single point of independent grounding, grounding resistance less than 4 Ω), the control circuit adopt feet shielded wire, and wire segmentation in electric control cabinet, heavy current and weak current separation, if you want to cross, it is best to cross, and so on. the main products: stepper motor, brushless motor, servo motor, stepping motor drive, brake motor, linear motor and other kinds of models of the stepper motor, welcome to inquire. Telephone: