Need help controlling 110vDC motor

[Ubergeek63]

i got a 130vdc 3.5hp treadmill motor (must have been a big treadmill!)
i run it at 148vdc from lithium polymers. but a full wave bridge and a few big caps is the same.. this powers a bicycle.

i used a sg3524 ... almost half the pins are grounded out or connected together, so its really easy circuit.. i use a murata dc-dc 1watt converter to get my 12v (few bucks) for the chip... but u guys got AC so whatever...

anyway... all u need is a few caps , a few R's and a trimpot for throttle,.. then output to a tc4422 driver... then output that to whatever.

igbt u may want negative gate volts at turn off, so go with a driver like td351 that has active miller clamp.... or actually use negative volts.

i bet the schematic is on this site lol..

Actually that is a standard professional grade teadmill motor. They are rated for 500lb joggers.

So...how much did you pay for the lithiums? must have been quite a bundle to supply 3KW for a reasonable amount of time.

at any rate you are oversimplifying. you need a good gate diver, phenominal switch (60A@200V), 60A high speed rectifier, and sufficiant thermals to keep the junctions below 100C when they are both dissipating over 50W each.

Dan

 

[a31ford]

Update to DC motor speed controler.

It turns out that DART Contorls has a real nice controler 125D with options C and V (high voltage and variable Hz, C and V respectively). I stumbled onto the original post of a schematic on the first page of replies to this original post (125Dmanual.pdf) I googled it and found the mfg. (DART), they have a great site, AND there are many of their controlers for sale on ebay.

NOTE: I am NOT affilated with DART or ebay, just a guy looking for a good DC controler, and was impressed with DART's website.

Ebay's site on these:

dart controls items - Get great deals on eBay Motors, Business Industrial items on eBay.com!

As well Dart's corporate website.

125D 1/50-1HP DC Drive | Dart Controls


Greg