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variable frequency drive construction? Answered

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hello i am working on a go kart but instead it will be powered by a 1/3 horsepower split phase AC motor. it operates off 768 watts and i am curious in using a Microcontroller and a high power H bridge to control it. can anyone help me or give me an idea on how to step up 12v dc into 120v dc and then using the H bridge to generate the frequency and also where to find some NPN transistors that can handle it and how to possibly reverse the direction of the motor?

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mpilchfamily (author)2012-07-07

A motor like that will either need a huge bank of batteries which will vastly hinder the abilities of the cart or a very long extension cord. You should look into other motor options. You should be able to find 1/3 horse power DC motors but they won't be cheap.

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PetrusH1 (author)mpilchfamily2016-06-01

Use a DC motor from a treadmill, I have been using them, they are cheap, and easy to use.

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rickharris (author)2012-07-07

Oooo complicated project.

In the end bear in mind that no matter where the power comes from there is only a certain amount available.

So ignoring losses 768/12 volts is 68 Amps - that's a BIG ask from a battery.

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luig (author)rickharris2012-07-09

yea im quire aware that my batteries are going to hate me, but i still want to be able to control AC motors and this is a good way to start and after all i scale up the go kart to a dune buggy like design but i need to start with something, in this case the electronics

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steveastrouk (author)2012-07-08

Forget it. Its a lousy design approach. Get a DC motor.

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