Bunmi

Help! My magnetic powder clutch used for precision tension control still exhibits a slight damping on the output shaft after each power outage, approximately 1% of the rated torque. This residual torque can deform the material during ultra-thin copper foil production. Repeatedly switching the excitation current on and off to demagnetize it has little effect. Is this due to the coercivity of the magnetic powder itself? Is there a circuit for rapid demagnetization, such as using reverse-attenuated AC? Can anyone with experience provide guidance?