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Kale
Nobel Prize Winner
Canada
795 Posts |
 Posted - Nov 28 2003 : 11:09:00 PM
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I bought a couple really tiny remote control cars from some guy in a mall. They are about two inches long and have a receiver good for about 12 ft. Anyway, they are powered by a very small rechargeable lithium ion battery and have a 2.7V motor in them. At full charge the motor is so powerful that the rear wheels loose all traction and the car just sits there. I actually have to manually pulse-width-modulate (by carefully tapping the 'forward' button) to tone the acceleration down until it starts moving. I can do 'T' stops, 180's, 360's, etc. with this little thing. They drive my cat crazy too!
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Aaron Cake
Administrator
Canada
6718 Posts |
Posted - Dec 01 2003 : 09:57:26 AM
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Well, what I propose is increasing the number of turns in each coil with a thinner wire than the original, in such manner that the volume of wire remains the same, that will draw less current, but the scooter will accelerate slower. To get the right number of turns just calculate the section of the wire, multiply it by the original number of turns and then divide it by the section of the new wire. I use double amidanel copper wire wich tolerates up to 200ºC. No need to say that the conections and winding direction of the coil shouldn't be changed at all.
That's an interesting idea, but the more thought I put into it, the less time I have to rewind a motor that shouldn't be used anyway. Might be a great academic exercise, but when I can find a proper motor for $20, it seems pointless to "flog a dead horse".
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You should consider the regen (if you plan to build the control), it will make your battery run longer, the mosfets wont heat up heavily because of the EMF and CEMF of the motor
Not sure if it's worth it...For all the effort, is an extra 15 feet of range such a big deal? 
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th motors on a hot weels tingy ar geard. you can remove th motor itslf and it will go fastr. that is one hell of a battery!
If you remove the gearing, the motor will probably not have enough torque to move anything.
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Electric Scooter Sadness
