Single-phase
induction motors are not self-starting without an auxiliary stator winding
driven by an out of phase current of near 90 degree. Once started the auxiliary
winding is optional.
The
auxiliary winding of a permanent-split capacitor motor has a
capacitor in series with it during starting and running.
A capacitor-start
induction motor only has a capacitor in series with the auxiliary winding
during starting.
A capacitor-run
motor typically has a large non-polarized electrolytic capacitor in series
with the auxiliary winding for starting, then a smaller non-electrolytic
capacitor during running.
The
auxiliary winding of a resistance split-phase motor develops a phase
difference versus the main winding during starting by virtue of the difference
in resistance.
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