capacitors advice please

[matt1e]

yaaay, it lives !!!

new cap (400v 40uf) & it roared back into life !!!

I think the motor maybe running slightly faster, but that might be bad memory... or just a really old foobar cap that was dying slowly...

nowt wrong with your memory mate on PSC motors the start winding becomes an auxiliary winding that supplements the run winding once started (which is why the cap values are carefully matched to the motor) so yes it will run better with a healthy cap

 

[josh1e]

so yes it will run better with a healthy cap

that's good to know... I'm glad it worked, but it being faster did concern me wether i'd done something wrong or if it was speeding up to go bang lol I've to be honest & say while i understand they store energy for instant release, i don't say i fully understand them & there effects / uses...

nowt wrong with your memory mate

still think the missus might disagree, sure there was some washing up to be done /shhhh

thanks m8

 

[ban-all-sheds]

while i understand they store energy for instant release, i don't say i fully understand them & there effects / uses...

[hint]CIVIL[/hint]

 

[RF Lighting]

I haven't heard CIVIL since I was at college

 

[josh1e]

Hi BAS,

thanks for the hint lol..

a quick google search explained quite alot, having had a problem with the cap & seen almost exactly the result below, i can understand the following better

CIVIL

in a C(capacitor) the I(current) leads the V(voltage). So when the voltage is falling, I<0.

always nice to have an understanding of things, rather than just get them fixed. even tho getting them fixed was the point

 

[plugwash]

The basic equations for capacitors and inductors are

For capacitors
I=C dV/dt

For inductors
V=L dI/dt

From theese equations thier behaviour under different types of circuit can be analysed through a variety of mathematical techniques.