Author Topic: Motor-run capacitor RMS current  (Read 925 times)

Offline MRMILSTAR

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Motor-run capacitor RMS current
« on: April 16, 2020, 06:03:22 PM »
I use several 100 uF, 400 volt motor-run capacitors for PFC on my SGTC. I have tried to find the RMS current capacity of these capacitors with no success. Does anyone know what the typical RMS current capacity of a typical 100 uF, 400 volt motor-run capacitor is?
Steve White
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Retired electrical engineer

Offline John123

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Re: Motor-run capacitor RMS current
« Reply #1 on: April 16, 2020, 07:01:09 PM »
Any idea what the motor was rated for?

Offline davekni

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Re: Motor-run capacitor RMS current
« Reply #2 on: April 16, 2020, 07:33:14 PM »
Steve,

I doubt you'll find a specific RMS current rating.  It's implied by the capacitor's other specifications, 400V, 100uF, and 60Hz, 15.1A in this case.  Since motor-run capacitors are typically polypropylene these days, there's a good chance it can handle more than 15A.  There's just no need for the vendor to test higher since it's intended for 60Hz use.
David Knierim

Offline MRMILSTAR

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Re: Motor-run capacitor RMS current
« Reply #3 on: April 16, 2020, 08:31:30 PM »
Any idea what the motor was rated for?

I am not using them for a motor. I am using them for PFC as part of my spark gap Tesla coil. I bought them new.
Steve White
Cedar Rapids, Iowa
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Offline k42

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Re: Motor-run capacitor RMS current
« Reply #4 on: April 28, 2020, 02:51:15 PM »
I believe these capacitors should work very well in 50/60 Hz PF correction... In motor applications, the voltage over the capacitor often rises much higher than the supply voltage, for example, I've measured around 500 V over a capacitor which was in a 230 V motor.

Just be sure that they are run capacitors, not start capacitors.

Offline T3sl4co1l

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Re: Motor-run capacitor RMS current
« Reply #5 on: April 30, 2020, 05:39:25 AM »
Yes, intended for mains operation, and that's about it.  The connections are typically foil ribbon, giving relatively high ESR and ESL, much lower current capacity than it could be.  The connections may also be fused, by themselves or by gas expansion inside the can forcing the connections apart.  (I have some cylindrical types with an embossed rim that, according to the patent, is supposed to expand like an accordion, pulling the connections apart, under these conditions.)

Tim

High Voltage Forum

Re: Motor-run capacitor RMS current
« Reply #5 on: April 30, 2020, 05:39:25 AM »

 


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