Overpriced Stuff: Electric Motor Speed Controllers Answered
Commercially, speed controllers for electric motors (electric car size) are very expensive, like on here.
That page has a controller capable of 144v at 550a peak (about 90 horsepower peak) for $1250. I just designed a speed controller with parts off of digikey.com for about $200 that could handle 144v at 690a continuous so it could probably get over 180 horsepower peak.
All things considered, their's costs over 10 times as much per amount of power.
This seems like a BIG markup. I can understand shipping costs, labor costs, etcetera, but something seems a little messed up here.
I am not sure that the design is quite right, and haven't done it myself, so criticism is good.