27 Aug '17, 3pm

@stuartfram inverter hardware

The first lesson I learned when building up my inverter was the importance of a nice stout DC bus. Use flat copper bus bars to connect the capacitor bank to the IGBTs. Keeping the inductance low is key to not blowing IGBTs up, you want to minimize the wire length between the capacitors and IGBTs. Another lesson, make sure you have hooks in to automatically disable the inverter if the DC bus voltage gets too high. I was surprised that regen worked without any effort, even in volts / hz mode. I was lucky I didn't blow up my capacitor bank, I hit voltages over 400 volts a few times by accident. Also make sure you have proper fusing, IGBTs fail as a short circuit. Congrats on getting your motor spinning! You can get a little more low end torque by adding some voltage offset at low speed. Instead of following the V/Hz curve down to 0 volts, 0 Hz, try 10 volts @ 0 Hz.

Full article: http://www.diyelectriccar.com/forums/showthread.php?t=45909

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