Wed Dec 29 22:48:42 EST 2010
Generator from 1-phase motor
A 1-phase induction motor motor is actually a 2-phase motor, with a
capacitor providing the +- 90 degree phase shift.
Is it possible to ditch the cap and use it in proper 2-phase?
I.e. is the 2nd phase somehow cripled for power rating?
Context: low-power 3-phase motors are expensive. Low power 1-phase
are almost free (old junk). It migt be more interesting to
concentrate on recycling junk to build crank generators.
However, a 3-phase is supposed to be more efficient. Why is that?
Is it true that a 1-phase motor does not give constant power? This
makes sense, as both V and I go through zero at the same time
(ignoring coil inductance).
For low rating (+- 100 W) the electronics are also going to be
a lot cheaper. Where to get transistors?