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measuring current of one dc motor with CT

 
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payam

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Joined: 15 Nov 2005
Posts: 42

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PostPosted: Sun Oct 11, 2009 7:04 am    Post subject: measuring current of one dc motor with CT Reply with quote

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 donít 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
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mattcro

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Joined: 03 Oct 2007
Posts: 324
Location: Scotland

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PostPosted: Sun Oct 11, 2009 8:59 am    Post subject: Reply with quote

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.

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