measuring current of one dc motor with CT

payam · Joined: 15 Nov 2005 Posts: 42

Hello every one
I want to use CT for measuring current of one dc motor(a bout 0 ~30 A-12 or 24 VDC) and at last sensing it with ADC(I don’t want measure it exactly I want sense over load current ,continues current ,no load current and whit out current from each other ) please recommend me one circuit a bout my problem
Tank you
Best regard
Rabiei.payam Embarassed

mattcro · Joined: 03 Oct 2007 Posts: 327 Location: Scotland

Current transformers only work on AC systems. You can use a hall effect sensor to detect the magnetic field from the motor cable.

Have a look at the Allegro current sensors - they are isolated DC sensors with parts rated for 50Amps or so. There are probably other manufacturers with similar sensors too.