A lot of people are asking me where they can get the DC motor known as the Kostov. If you’ve found it difficult to obtain a Kostov, then you’re in luck; Elprom-ems, a Bulgarian motor company who have long been making fork-lift motors are stepping up their production of AC and DC motors specifically for the EV market.
Some of them are big mothers, able to handle over 95kW comfortably with a Kostov 10.7 inch delivering around 30hp continuous and over 180hp peak. From close inspection of the one I have, they appear to be ruggedly built, like a Vostok one could say – ‘bullet-proof’ as others have said and I can see why.
Elprom Kostov DC Motor.
DC motors can get very hot under load but the Elprom (Kostov) 10.7 inch motor (aka Elprom Frame size 268) has a heavy-duty cooling fan built in to help cope with the workload. From a spin test before installation in my car, a measurement was taken at full speed and at just 12v it drew 22A making 264 Watts. Their specs @144V state 22kW at 4000RPM. However the voltage rating can be higher than that, allowing me to add more batteries in the future (space permitting).
Check out www.elprom-ems.com. They even have a ‘frame 326′ motor (approx 13 inches); imagine one of these for your EV! Email them for specs, they’ll be happy to send you information and schematics; very friendly people.
{ 4 comments… read them below or add one }
“Hi, my motors come from Elprom-EMS. You can contact them here –
http://www.elprom-ems.com/ – or try Advanced DC – http://www.adcmotors.com/public_site/products/.
Sorry I don’t have further details at hand – I am currently away from my office.
Best regards,
Carmel
Hi
iam reza . iam a mechanic designer …
we search the kind of your motors , that we need …
but we dont have any graph of tourq and Rpm about that …
the type of motor is : EC 10/7 , 5/28
and please send all of your information of your motors in 10 Kw that used in EV …
please help me …
thanks for your atention …
Hi David,
Yes the Curtis is the limiting factor I am mostly concerned with. I had been looking into getting a Zilla but there is possibly another way to apply a ‘boost’ to get the power I want when I need it, and that is the momentarily (and albeit risky) method to switch in a Curtis bypass and get full power direct from battery pack for a short burst. I’ll be doing a post about this in the future if it susses out as possible without blowing my motor and money.
Regards,
Carmel
Hi Carmel,
I was wondering if your Thundersky pack plus Curtis will be able to feed such a large motor? I figure at 90kW/140V is 642A. The Curtis 500A limit and Thundersky cell resistance may come into play. Would be interested to hear your thoughts…..
BTW I have a 144V Optima D31 lead-acid pack (very low series resistance), Curtis 1231C but just a little 6.7 inch motor. Max current I have seen so far is 330A, but I haven’t floored it yet. Even with my smallish motor the stock clutch was shredded – it developed twice the torque of the original ICE motor!
Cheers,
David