100MFD 55V

From: vrs <vrs_at_msn.com>
Date: Thu Dec 4 13:01:43 2003

> Motor-start and motor-run are different but the same. A motor-run
> capacitor is AC and is connected all the time. A motor-start capacitor
> is connected usually through a centrifugal switch (and starting winding)
> so it is only connected during spinup. There are many motors that have
> centrifugal switches and starting windings without caps. and most of
> the caps used are fulltime, that is run caps. Now, my definitions may
> not be everybodys definitions, but that was how I was brought up when
> I did motor repair and rewound armatures. The giveaway was the
> original spec stated 60 cycle, which is a motor capacitor. run or start
> is not significant, but if it said 60 cycle, then it cannot be a DC
> cap with plus and minus.

Ah, now I understand why people think it is motor run. It's because the can
says "60 CY" on it.

> As stated in a previous message, the capacitor "creates" a second phase
> so you can get the motor to spin. Too little or too much capacitance and
> the created phase is not in the proper angle to provide the right
> rotation. again, make sure you get at least the minimum voltage, and
> getting a cap with more voltage spec is o.k., if you cannot match
> the capacitance, I think I would err toward more rather than less.

Everyone loves explaining this to me :-). Thanks everyone, but I think I
have a pretty good idea what motor capacitors do now.

Now my problem is locating a 100uf motor run capacitor. (I still don't get
what that paste is that is coming out the top.) The non-polarized
capacitors I am finding seem to top out around 80uf. I suppose I could
install a pair of 50uf capacitors.

I also checked the drive and one of the other vents looks a little puckered,
so I'll likely need to replace more than just the one.

Thanks!

    Vince
Received on Thu Dec 04 2003 - 13:01:43 GMT