-=> GEORGE WHITE wrote to WAYNE CHIRNSIDE <=-

 GW> Hi WAYNE,

 GW> 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.

 GW> They are there initially for startup, however, as it's AC we're
 GW> talking about here they are not "charged up" (that would need DC),

Should have known this.
I _have_ experience with tank circuits in trasnsmiters

 GW> so
 GW> they are either "Cap Start" where the capacitor is in a transitory
 GW> "Start Switch" and you have to use a special switch, or
"Cap Start/Cap
 GW> Run" where the capacitor stays in circuit all the time, providing a
 GW> lagging winding.

Yup, thanks for the clarification
 
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