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Electric motor tuning?

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retrowagen1234 Guest	Electric motor tuning?retrowagen1234 @GUEST
	Jul 7, 2009 11:46:10 GMT Select Post Deselect Post Link to Post Back to Top
	This is more of a question than anything... ive finally got underway with a project thats long been waiting in the wings... I'm building an electric assist bike... its going to be a bit better looking than most lol (i hope) think baremetal peugeot shopper bike. with rusty apehangers off a mk2 raleigh chopper... lol anyway back on track.. ive got a old scooter... was told before I collected it that it was the top end E-scooter.. (so the 500w one) turns out its a 250w which is a let down to say the least... but the motor is nice and compact... ive striped all the lights and gadgets off and run it down the road with a flat battery and an on off switch lol. it goes ok but not "quick" and the motor says max rpm 2,500 I used to tune rc motors to gain higher rpm but that was a long time ago.. anyone got any tips?? I need a bit of torque too being the difference, as rc cars didnt realy need any.. lol pictures will be posted of any work I do on it and ill start a build thread of the bike too lol
	Last Edit: Jul 7, 2009 11:56:52 GMT by retrowagen1234

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retrowagen1234 Guest	Electric motor tuning?retrowagen1234 @GUEST
	Jul 7, 2009 11:56:10 GMT Select Post Deselect Post Link to Post Back to Top



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The Ran Part of things Posts: 193	Electric motor tuning?The Ran @theran
	Jul 7, 2009 13:02:13 GMT Select Post Deselect Post Link to Post Back to Top
	Save for rewinding the stator I don't know what else could be done other than just running it over it's rated power. Looking forward to seeing more of this project though, that Peugeot thing looks rad.


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alecw35 Posted a lot Posts: 1,211	Electric motor tuning?alecw35 @alecw35
	Jul 7, 2009 13:26:08 GMT Select Post Deselect Post Link to Post Back to Top
	I think your only allowed 200watts on a 2 wheeled bike in the UK. Cant see a police man getting a mulitmeter to your motor though. Heres one of the electric bike websites. They have a few homebuilt bikes on it. endless-sphere.com/forums/


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retrowagen1234 Guest	Electric motor tuning?retrowagen1234 @GUEST
	Jul 7, 2009 14:03:42 GMT Select Post Deselect Post Link to Post Back to Top
	wow didnt know about that site cheers dude, yeah i had heard about the 200w limit (didnt know for sure tho) but I'm going to try hide it as much as poss... and hopefully try a few different things out. mainly building a quicker motor out of the 250w can, although i need a decent amount of torque too... the thing with the 200w limit is its pitifully slow.. you realy have to pedal on even flats so its pointless limiting it to that... the plan is to make it a bike with electric assist. and a way of giving it a lil bit of a nudge too haha


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retrowagen1234 Guest	Electric motor tuning?retrowagen1234 @GUEST
	Jul 7, 2009 14:05:12 GMT Select Post Deselect Post Link to Post Back to Top
	Jul 7, 2009 13:02:13 GMT The Ran said: Save for rewinding the stator I don't know what else could be done other than just running it over it's rated power. Looking forward to seeing more of this project though, that Peugeot thing looks rad. yeah I'm thinking of seing how it feels on 36volts.... there doesnt seem to be a limit on the motor , I'm just guaging it on the 24v setup its allready running...


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Deleted Posts: 0	Electric motor tuning?Deleted @Deleted
	Jul 7, 2009 17:57:57 GMT Select Post Deselect Post Link to Post Back to Top
	Should be fine with 36 volts. If it gets too hot drop it down to 24 again. My Pop had a 6 volt system and the starter motor was fine running on 12V. Onto tuning. I used to tune miniature motors and basically used to space the magnets in with shims. This would increase both top end speed and torque across the rev range. On a big old motor you'll be surprised how much closer you can get them. Then you need to see if you can push the brushes a few degrees in the direction of rotation a bit so they are more 'advanced'. This should see you a few more revs. If they're cheap permanent magnets you can remagnetise them on a much stronger magnet and that also makes it run faster. I used to do mine on the back of a speaker.


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lewist123 Posted a lot Posts: 2,006	Electric motor tuning?lewist123 @lewist123
	Jul 7, 2009 19:19:59 GMT Select Post Deselect Post Link to Post Back to Top
	Just up the voltage and keep an eye on the heat. Maybe uprate cooling to the motor to help control heat! You could also advance the timing a little (2 degrees or so) will make a bit more power but again will up the heat load! I used to run 7.2 volt rc car motors at 11 volts using Lipoly batteries with minimal problems Get the gearing right though. figure out what speed you want, say 10 mph and gear accordingly. Nothing worse than overgearing an electric motor. The other option would be to run a geared rear sproket with associated gear. that way you can get some reasonable hill power, and a good cruise on the flat. Lewis


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retrowagen1234 Guest	Electric motor tuning?retrowagen1234 @GUEST
	Jul 8, 2009 10:35:57 GMT Select Post Deselect Post Link to Post Back to Top
	wicked cheers guys, i thought those ideas would be the case (same realy as rc ones) but didnt wanna risk mullering a motor lol... ill get some pics up in a sec


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