Hi WAYNE,

On 31-Jul-03, WAYNE CHIRNSIDE wrote to JASEN BETTS:

 BR>> I wonder if that's the same technology as A/C motors that use
 BR>> capacitors and how one would calculate the uF value?

 JB>> AFAIK motors with capacitors are split-phase induction motors ...
 JB>> dunno of the cap is doing phase conversion or power factor
 JB>> correction or both.

 WC> I _think_ they use it on a starter winding as without it they
 WC> won't start or won't know which direction to turn. The cap
 WC> introduces phase shift in a _start_ winding kicking the motor off
 WC> and running then as charged sort of just leaves the picture. I
 WC> _think_ that's how they work anyway.

They are there initially for startup, however, as it's AC we're
talking about here they are not "charged up" (that would need DC), so
they are either "Cap Start" where the capacitor is in a transitory
"Start Switch" and you have to use a special switch, or "Cap Start/Cap
Run" where the capacitor stays in circuit all the time, providing a
lagging winding.

George

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