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I'm using a wiper motor with a PWM, and a 110-240V AC to 12V DC 5A Switch Power Supply, for my cauldron creep stirring action. Here's the PWM I have: http://www.amazon.com/gp/product/B005UTBGIG/ref=oh_aui_detailpage_o03_s00?ie=UTF8&psc=1
and here's the power supply: http://www.amazon.com/gp/product/B0026SUMNY/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
I'm not going to be able to even have my brand new cauldron creep running in my yard because when I slow it down to about 20 rpm, which is still slightly faster than I'd like it, I get this horrible fast pulsing whine. The slower I go, the deeper and louder the whine. Still, anything below about 35 or 40 rpm is so loud it can be heard three houses down. I've tried it with two different motors; one being a wiper motor, and the other a window crank motor, which looks like a smaller version of a wiper motor, and still get the same results. In fact, the smaller motor is even louder. I've also tried a smaller 12v DC 500ma wall wart hooked to the PWM for power, but still got the same results.
Before trying the wiper motor, I did have one of the NEW vent motors in there, but it's waaaaaaaay too slow, at only about 3rpm, so I popped in the wiper motor and PWM board today. The old style vent motors were just fast enough, but I don't have any more of those to use. Is there any way to either speed up the vent motor, which would be my first choice, or to slow the wiper motor and not have the horrible noise involved? Or, should I be using a different motor setup altogether? Please help!
and here's the power supply: http://www.amazon.com/gp/product/B0026SUMNY/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1
I'm not going to be able to even have my brand new cauldron creep running in my yard because when I slow it down to about 20 rpm, which is still slightly faster than I'd like it, I get this horrible fast pulsing whine. The slower I go, the deeper and louder the whine. Still, anything below about 35 or 40 rpm is so loud it can be heard three houses down. I've tried it with two different motors; one being a wiper motor, and the other a window crank motor, which looks like a smaller version of a wiper motor, and still get the same results. In fact, the smaller motor is even louder. I've also tried a smaller 12v DC 500ma wall wart hooked to the PWM for power, but still got the same results.
Before trying the wiper motor, I did have one of the NEW vent motors in there, but it's waaaaaaaay too slow, at only about 3rpm, so I popped in the wiper motor and PWM board today. The old style vent motors were just fast enough, but I don't have any more of those to use. Is there any way to either speed up the vent motor, which would be my first choice, or to slow the wiper motor and not have the horrible noise involved? Or, should I be using a different motor setup altogether? Please help!