I am using a 90vdc motor and a custom built, variable speed controlled DC drive using a 15 amp IGBT. I do not know much about the DC drive as it is "potted" and all components are sealed. I only know there is a 15 amp IGBT. The motor lead is fused with a 5 amp fast blow fuse. The motor has to be able to be stalled and handle polarity reversal. I have found that the motor will run at full speed at times but never blow the motor fuse. Is this a problem with EMF and would a varistor solve the problem. Also does it matter where on the motor leads this component is used(I.E. before or after the fuse, close to the motor or could i put it further from the motor?)
Your help would be greatly appreciated
Your help would be greatly appreciated