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| S. Heslop:
I'm trying to build an electric bike. It's hard to find information about directly that on the internet since most people like to call installing an overpriced kit as 'diy/ homemade'. One thing giving me alot of trouble is sourcing a suitable motor. On ebay looking for scooter motors and DC motors I can't find any over 350w, and searching on google just gives me a load of shady Chinese websites. Are there any good websites/ catalogues for buying spare and surplus motors in the UK? Or could I maybe try looking for something else. I think I once heard a thing about using car alternators as motors for kiddie cars. |
| vtsteam:
Older brushed generators would probably work. I know it sounds weird but what about a brushless R/C motor and ESC? Raynerd could probably help out there, since he built a CNC motorized mill spindle with one. |
| vtsteam:
How about this one: http://www.giantshark.co.uk/product/169401/xyh63-54-250kv-65a-outrunner |
| vtsteam:
I don't know your price range Steve, but if you only want to get 500 watts out of it, the above would be nicely overbuilt, yet have the advantage of a low kV (meaning revolutions per volt) which will reduce your gearing down requirements. If you limit it to 500 watts, you might be able to get by with an ESC of say 60 amps (rather than the more expensive recommended 100a ESC). You would need a slip clutch or some means of preventing over current/stalling, but probably would for a 100 amp ESC as well. Also, of course a throttle stop. The lower the voltage the easier the gearing is going to be. 4 Lipos appears to be the minimum recommended for this motor, which is about 15 volts -- that would still yield about 600 watts @ 40 amps. Motor RPM would be about 15V x 250 kV = 3750 RPM If you went to 5 lipos, that's about 19 volts and you would run a max of about 25-30 amps to get you in the 500 watt range. Even a smaller ESC, but gearing ratio would need to be higher. Motor RPM would be about 19 V x 250 kV = 4750 RPM |
| S. Heslop:
Thanks for the reply. Yeah that looks like a good motor. It's much smaller than the scooter motors I was looking at too, and about the same price (if not cheaper!). I guess the brushless controllers bring the price up though but it's still within what i'm happy to pay. I guess the next problem is figuring out how to gear the motor down with the tools I have. |
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