I think you nailed what I need. Wiki doesn't explain it simply, so I searched somewhere else and I got this:Maybe you want a
Permanent-split capacitor motor?
Ok, I assume that you mean by 90 phase shift that to provide two forces (from the two windings) that act together as a torque?The two basic cap start types are combined permanent cap start/run where there is only one cap used for both starting and remain in for run.
The second has both a start and a run cap, the start cap is to provide sufficient energy to the start winding for the initial start and switch over to a smaller run cap for continuous run.
The reason for the cap is to provide a 90° phase shift in the start winding WRT the run winding, if no capacitor is used the field oscillates across 180° and results in zero rpm.
For your OP question, the single cap start/run cap that is kept in circuit is connected the same way, in series with the start/run winding.
Max.
Basically, if some kind of phase shift (~90°) is not produced initially in a second winding then the magnetic field oscillates across 180°, so no rotation results.Ok, I assume that you mean by 90 phase shift that to provide two forces (from the two windings) that act together as a torque?
.
Thanks Man, simple and sweet!Basically, if some kind of phase shift (~90°) is not produced initially in a second winding then the magnetic field oscillates across 180°, so no rotation results.
Motors with failed caps can be given a swift turn and will usually run once spun.
Another method instead of a cap used in small motors such as fans is the shading ring, this is a shorted copper turn, the high current in it produces a phase shift in that part of the stator.
Max.
Thanks Max; max info!Your DWG in post and summary in #14 is correct, the one in #6 incorrect, one too many windings.
With the start and run type both caps are in circuit (in parallel) initially, then the start cap is switched out when up to speed.
Max.
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