At 04:28 PM 14/09/2015, you wrote: >Might also be able to just buy a commercial VFD (Variable Frequency Drive) >This is about the smallest I've seen: >http://www.newark.com/schneider-electric/atv12h037m3/ac-drive/dp/11R1086?C= OM=3DPower&Energy >and the datasheet spec's 400hz as it's max... 115V ones are a bit rare on the ground though. If 230V power is=20 available and you can set the voltage output to 115 that should work. You can use a sound card plus a stereo amplifier to create a=20 three-phase sinusoidal output, using four step-up transformers. --sp =20 --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .