does any one know what is the purpose of having two capacitors in a single motor i know theyre for start up but why two? and how if i cannot find replacement capacitors could i replace the both for a single one

 

One is for starting and one is for running. And no, you need both.

Regards

cww

 

Responding to anonymous' Jan 29, 1:26pm query... there are two reasons for the dual-capacitor motor:

1) Higher Starting-Torque.
The parallel combination of two caps, one, electrolytic, the other, oil-filled, are inserted in the start-winding circuit. The electrolytic cap provides a higher starting-torque and is operated intermittently. The smaller cap provides a smoother running torque and is operated continuously.

2) Lower Cost.
The two-cap case using an intermittently-rated high-capacity electrolytic cap, together with a continuously-rated low-capacity oil-filled cap, yields a lower overall cost than the single-cap case. The MFD of
the electrolytic cap is 10 to 15 times that of the oil-filled one!

Regards,
Phil Corso, PE {Boca Raton, FL, USA}
[[email protected]] ([email protected])

 

!!!could be a 3 phase motor, not the best way but it works if load is constant and caps are correct size. It's all to do with phase shifting!

 

One is a start capacitor and the other is a run cpacitor.

 

I have a motor with three leads to the second capacitor. Unfortunately, the capacitor was removed. Any idea what the wiring is? It is a Gould SFE10754S (Emerson T63MWCTY-1531), and no, Emerson apparently does not keep records of their older models. Go figure...