[Zero Cool]

I have been doing a lot of work researching and designing a new PWM motor controller board for use with universal type motors. in my case specifically the Dremel tools, but any universal motor can work.

I currently have a PWM system built and a dremel tool modified with the internal speed controller removed and the PWM system wired to the dremel tool and it works fantastically! I am now working on an optically isolated version to make it safer. I am also working on a speed feedback system as well.

I have been considering offering some version for sale if there is enough interest.

Versions that might be of interest would be:

1-basic - manual control with opto isolation of control circuits from the AC line. for dremel and trim routers etc. maybe a max of say 5 amps???

2- Med - manual control with speed feedback. same as above with feedback system

3- full bang - microcontroller control of speed. PWM and Step/Dir signal inputs, speed feedback, controlled start up and shut down. etc.

I could sell them as board/kits or full finished products if there was more interest one way or another. also possibly full kits with modified dremels etc.

Zc

[jjobezo]

Sounds cool. What amps, volts and prices are we talking about.

[Zero Cool]

well. I don't have all the details worked out yet.

But the PWM controller would run off of 120Vac and provide 170vdc to the PWm circuit and would be electronically limited to 70% to = the 120V line so as to not run overspeed. but will have some headroom for high loading. I could probably do 5-10 amps easy enough. if there was particular demand for higher current or lower voltage etc that is easily do able.

the basic controller would be priced about $99 for a finished controller and maybe $50 for a kit

The advanced controller would probably be $299 and I am totally guessing and tossing these numbers out there. A lot would depend on what the total cost would end up being. cost plus $20 or something.


Zc

[Al_The_Man]

A few years ago I picked up a surplus Universal motor and controller, the controller was built around the TDA1085 IC, originally meant to control washing machine motors.
The motor had a very simple (crude) pulse wheel feedback, I was very impressed with the performance, especially low speed for band saw use.
It also has current limit built in etc.
It can be used with a Triac to control the motor with AC or fire into a bridge and use the motor in the DC fashion.
Mine was designed in latter style, In DC mode.
Once designed, it could be much cheaper to produce, maybe.
Al.

[alipavsky]

Hi,
I would be interested. It's been a while since you last posted here. Are you still working on/with this?