Quote:
Originally Posted by TheSGC
Wow, another controller!
Don't even bother with MOSFETs, go all out IGBT's. MOSFETs are decent in controller up to 156 volts, anything above that you need IGBTs to handle the higher voltage, and I believe the pricing actually goes down when you get into that high voltage range.
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For low powers, MOSFETs are cheaper than IGBTs. Only at high power does IGBT become cheaper.
A good start would be one to power a small 1/4HP motor for the power steering pump or a 1/2HP A/C compressor. Then move onto the main motor.
BTW, small motors generally do not need resolvers. If you use a common industrial induction motor, you can just lock the transmission into one gear (maybe even remove the unused gears to reduce friction) and use the speedometer signal as the resolver.
A lot of industrial motors can be wired in different ways. For a common 208-240v/480v motor, there are 4 ways to connect it - 208v Y, 208v Delta, 480v Y, and 480v Delta. If you're going for single speed, you'll probably want it wired for 208v Delta. Or use contactors to dynamically switch between the connections. The two sets of windings are wired in parallel for 208v, so it should be possible to drive the two sets from two power stages in order to facilitate current sharing.