Customer Reviews

Ramsey MSC1C DC Motor Speed Control Kit

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I bought this kit at an electronics store under the promise that using PWM it would slow down a DC motor without losing torque. The documentation even said that if it detected a stall it would apply full voltage until the stall was removed, allowing the motor to continue operation. After I built it, I had it verified by the tech at the store, and then I excitedly it up to realize that it, in no way, shape, or form, delivered on its promise. Sure it allowed the speed of the motor to be decreased, but at a signifigant loss of torque too! I couldn't use this in my application because at the speeds I needed, there was not enough torque to turn the motor.

The documentaion is very condescending, claiming that the company knows the kit works as advertised, and if it doesn't, then it must have been assembled incorrectly, but they provided some free phone support. I contacted the manufacturer to discuss why it didn't work, and the "engineer" I spoke to said I was confused in what it was supposed to do, or that he didn't know how it worked. Either way, he was no help what-so-ever and offered no resolution.

I put the controller on the shelf and then had another use for it a few months later where torque wasn't a big deal, this time controlling a DC centrifugal blower. It didn't work on that either. I took it back to the shop to get an explaination, and was told that the blower porbably converted the DC current to AC internally, so it wouldn't work in this case. Again, useless. Not as advertised.