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Old 8th July 2008, 01:07 PM   #1
Clipped is offline Clipped  Thailand
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Default electric motor controller

can someone help explain how an electric motor controller operates for an electric cars motor?

something like an amplifier, or basicly a PWM power supply? is it class D, G...etc?

thanx
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Old 8th July 2008, 04:01 PM   #2
jol50 is offline jol50  United States
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Here is a little info, I think they are more or less one tiny amp output stage with a variable controller using mosfets. When I had my car I could hear it whine from the switching.
http://www.math.niu.edu/~behr/RC/speed-ctl.html
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Old 8th July 2008, 05:16 PM   #3
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On small engines, like rc cars, the motor is controlled by switching FETs via PWM. I assume the control principle is the same for large DC motors.
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Old 9th July 2008, 03:46 AM   #4
Clipped is offline Clipped  Thailand
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reason im asking is im getting into electric cars (full size). so i can get off gas man, this $hits killing my wallet.

but these controllers need to handle around 96-140 volts and 1000 amps! ... and thats for the small guys. Ive wound a few generators, but motors need timing, unless theyre slip ring designs...even then without a controller, its full torque from the beginning and that aint good.

maybe i can talk Perry into designing one...
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Old 9th July 2008, 04:23 PM   #5
jol50 is offline jol50  United States
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Thought you meant RC car, but I imagine they work the same.

Only ones I know of are the performance controllers for golf carts, but most are 48v. You might look up the manufacturers and find something you need? Certainly the expensive part of electric power.
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Old 9th July 2008, 09:19 PM   #6
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There are motor controllers available. The one on the following site is good for 400 amps continuous.

http://www.ecycle.com/buckboost.html
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Old 9th July 2008, 09:33 PM   #7
jol50 is offline jol50  United States
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Quote:
Originally posted by Perry Babin
There are motor controllers available. The one on the following site is good for 400 amps continuous.

http://www.ecycle.com/buckboost.html
Interesting company
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Old 10th July 2008, 11:54 AM   #8
Clipped is offline Clipped  Thailand
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that one looks similiar to the 'zilla' controller, wonder if theres any affiliation...
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Old 10th July 2008, 03:02 PM   #9
ppia600 is offline ppia600  United States
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There are mosfets that have well over 100 amp current ratings... you could parallel enough to have over 1000 amp capability. Making it quiet enough to deal with would be the trick. Imagine an r/c car's switching noise multiplied by 100 lol.
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