Thursday, 30 May 2019

Proper inrush current limiter 50A universal motor


We have one dental equipment with one universal motor  in 2000W and 220V range shown below:


enter image description here


And we gave two corruption in selled device to customers which have inrush current problem by switching the universal motor, so one of the switch poles has been burned like this ( 220V 16A):


enter image description here



And 


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So i searched the internet for solution and seen the ntc in this inrush current :


2200÷220=10A >> 3×10A ~ its inrush current!!


Like MS35 NTC with this shape:


enter image description here


But it is expensive (~5 €), so what is any other way with ...?


Thanks for your attention.




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