Question about measuring current in a circuit?

Thread Starter

Göktuğ HAMBARCI

Joined Mar 27, 2017
1
Hi,

There is something I want to ask about the circuit that I share.The circuit is used to control a motor(draws about 30 amps.)
my question is this circuit how to measure current , what I understand is that the current is measured by raising the voltage on the resistor with the op-amp. but Why power line like this , Is there a shunt res which one is it?
I can not explain exactly, but if you understand something from these pictures, please help.
InkedInkedWhatsApp Image 2017-09-11 at 11.14.00_LI.jpg InkedWhatsApp Image 2017-09-11 at 11.14.00 (1)_LI.jpg WhatsApp Image 2017-09-11 at 11.21.54.jpeg
 
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