Pro/Forums - View Single Post - Easy way to power many pelts without expensive power supply.

murray13 · 09-20-2003, 01:49 PM

OK. There PWM controller takes DC and chops it up. Giving a square wave output. That is not as destructive.

Most (inexpensive) dc motor controllers that have a 120/220 AC input and drive a 90/180VDC motor have a waveshape that is anything but a squarewave.

The thing that destroys pelts from a bad power supply is thermal cycling, as I understand it. With a pure square wave all you are doing is turning the power on and off quickly. As you get away from a square wave the current starts to have more and more AC ripple. Which causes thermal cycling within the pelt.

Someone like Since87 could do a much better job of explaining this than I.

09-20-2003, 01:49 PM	#28
murray13 Cooling Savant Join Date: Sep 2002 Location: Omaha, NE USA Posts: 216	OK. There PWM controller takes DC and chops it up. Giving a square wave output. That is not as destructive. Most (inexpensive) dc motor controllers that have a 120/220 AC input and drive a 90/180VDC motor have a waveshape that is anything but a squarewave. The thing that destroys pelts from a bad power supply is thermal cycling, as I understand it. With a pure square wave all you are doing is turning the power on and off quickly. As you get away from a square wave the current starts to have more and more AC ripple. Which causes thermal cycling within the pelt. Someone like Since87 could do a much better job of explaining this than I.