What are the capacitor effects on a single phase induction motor?
Answer:
The results of capacitor use depends upon how the capacitor is employed. Without being able to demonstrate the various wiring methods with graphics here, it's too difficult to define them well without tons of words that might just confuse. I found a site that has the needed illustrations, and I would recommend this article:
http://www.iprocessmart.com/leeson/leeso...
It covers a) capacitor start / induction run, b) permanent split capacitor, and c) capacitor start / capacitor run.
The short but very helpful article provides information on the way the capacitor works to change motor behavior in each of these designs, and the advantages and disadvantages of each. When you read, start with the standard no-cap split phase as this will give you a baseline upon which the several capacitor designs will improve.
Edit:
Well, based upon the answers below, we seem to have a disagreement as to the nature of your question. Yes, the 90 degree shift is known, but that really doesn't describe the effects on the operation of the motor, which *seems* to be what you've asked ...
And I'd note that nobody has discussed power factor correction as yet (including the article I sited, which was a shortcoming).
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I studies that in my college last year but i forgot.. can you solve my question??we seem to be following the same branch,,,
http://answers.yahoo.com/question/index;...
Capacitor effects commutation of the currents in the controlled winding and circuit elements to provide gate signals of appropriate phase to thyristors or equivalent switching devices are provided, the arrangement being such that the winding currents interact with the rotor to produce a motoring torque at all speeds from standstill to near synchronous speed, the direction of motoring torque being reversed by phase reversal of the thyristor gate signals.
I do not believe that your question has anything to do with timing values for an electronic system of controlling a motor. Based on the question, the simple answer is that the capacitor causes a 90 degree lead which allows the motor to have a magnetic shift which causes the motor to start rotation.
in the case of a cap start motor the cap purely provides a shift in phase which results in propulsion of the rotor
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