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On 1/26/15 6:42 PM, twoten wrote:
The capacitor will shift by almost 90 degrees but I need a shift of 120.
Actually, you don't need a full 120 degrees. all you need is enough to
get the rotor spinning. Once it's spinning, transformer action makes the
phases all align properly.
The motor only pulls 2.5 amps per leg at 230volts. So what if I build 2
precision phase shifters from op amps and then drove the motor through
some beefy analog devices like igfets? Sure they would work hard
throughout the cycle and I would have to heat sink them but if I got
some oversized bruisers would they not accept their hard life in a stoic
fashion?