| Electronics > Beginners |
| Need a small induction motor |
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| Dmeads:
Hello! I would really like to explore electric vehicles, and I want to build my own motor controller/inverter like the ones in tesla cars (although much simpler). A youtube tutorial explained that the cars use a 3 phase induction motor and vary the frequency to control the speed. To model this, I am looking for a small 3 phase induction motor, somewhere around 20 volts or less per phase because I don't trust myself quite yet with anything higher. I have been looking around a while on ebay, but I haven't found much that looks promising. Does anyone know where I could buy one of these small motors? thanks |
| unitedatoms:
It looks like lowest voltage 3 phase motors are avionics 48V with 400Hz ac. Very expensive. It may be possible to rewind coils on 6 pole 1 Phase 1/50 horsepower squirrel cage tiny motors for lower voltage and run them on 60HZ AC with 3 phases. There should not be an issue with different voltage as long as amper-turns match the magnetics paths of original design. |
| schmitt trigger:
The smallest 3 phase motor I've seen is 1 HP, 208 volt. If you want to limit your inverter voltage to 20 or 24 volts, (for safety reasons) you can always use a 208/24 transformer in reverse, to step up the voltage. |
| Ian.M:
You can get 12V alternators with output current ratings as low as 50A, so just under 1HP. Remove the diode plate and regulator assembly, short the field brushes and bring out the three stator coil connections and you can run one as an induction motor. Add a belt drive to a second one with its diode plate intact, and provision to manually vary its field current, to use as a relatively cool running variable mechanical load, regenerating back onto your DC bus. |
| Zero999:
20V is far too low for an electric vehicle, because to get the required amount of power, you'd need thousands of Amps! It needs to run at a much higher frequency than the mains, otherwise it would be too bulky: the higher the frequency, the smaller the motor. |
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