As Ed mentioned, there are split-phase motors that have both a start
capacitor, and a run capacitor.
The capacitors are for more torque from their respective windings/modes.

As mentioned down the thread, CS-CR motors are often used on single-phase
powered air compressors, but also on a lot of motors for other relatively
high demand applications, up to about 10 HP (I'm fairly certain), as that's
about the practical HP limit for single phase motors.

The same is true of the capacitor in - just a capacitor-start split-phase
motor.. more torque for starting with a significant load applied to the
motor.
(images mspcs_01 and 02)

I don't know what was supposed to be illustrated by the gif in the link,
though. I couldn't navigate to any "theory" section of the website for a
description, but I did get to the directory the image is in..
http://www.electrical-contractor.net/theory/

There are 2 images of msP2v, the second image showing the rotation reversed.
I think the msP represents motor, split phase, and perhaps the 2v represents
reversible (as many models don't have access to the necessary terminals
required for reverse rotation).

The capacitors shown in the image are showing the appropriate difference in
values of the capacitors, as a Start cap is a high value, and a Run cap is a
low value cap.

BTW, there are also diagrams representing wiring diagrams of PSC permanent
split capacitor motors in that same directory, with the prefix PSC (upper
case).
Note that the use of the abbrev SCR represents squirrel cage rotor, not the
semiconductor device.
FWIW, PSC motors have 3 leads, and a resistance check will indicate 2
identical windings connected in series, similar to a center-tapped
transformer winding.

--
WB
..........


"Ed Huntress" wrote in message
...

snips

There also is such a thing as a capacitor-start, capacitor-run motor,
which has two capacitors, each operating in a different circuit. I've
never seen one that I know of. Don't ask. g

further snips

Any basic text on induction motors explains it better than I do here. It's
worth looking it up. The Web probably has plenty of resources.

--
Ed Huntress