How to Measure Inductance of Built-in Coil in Series with Motor Start Capacitor Assembly

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#1 21671882 06 Jul 2014 22:57

Mandar Arondekar Mandar Arondekar

Anonymous

Post #1
21671882 06 Jul 2014 22:57

Hi,
I have capacitor used for starting induction motor, there is one in built inductor coil inside capacitor in series connection.
As a complete assembly- without breaking capacitor how can i measure inductance inside the capacitor?
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#2 21671883 07 Jul 2014 06:00

John Schmitz John Schmitz

Anonymous

Post #2
21671883 07 Jul 2014 06:00

Several questions:
1) Do you know the value of the inductor?
2) What instrumentation do you have, i.e. what can you use to excite it and what can you use to measure?
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#3 21671884 07 Jul 2014 21:47

Mandar Arondekar Mandar Arondekar

Anonymous

Post #3
21671884 07 Jul 2014 21:47

I know the value of inductor it is 72 Micro Henry.
but at the time of testing more number of pieces i wanna check the value of inductor inside the capacitor without breaking the capacitor.

I have LCR meter.
#4 21671885 08 Jul 2014 06:51

John Schmitz John Schmitz

Anonymous

Post #4
21671885 08 Jul 2014 06:51

I asked the wrong question, meant to ask - do you know the value of the capacitor?
Assuming you do,
An LCR meter uses as AC signal to measure impedance. If you know the frequency it is using then take the reactance part of the measurement and subtract what the capacitors contribution should be, the remainder will be the inductor. Knowing the reactance and the frequency you can calculate the inductance.
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How to Measure Inductance of Built-in Coil in Series with Motor Start Capacitor Assembly

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