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Author Topic: Current limiting and overload protection  (Read 1670 times)
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Hi,
I have been trying to find out how to create a solid state current limiting circuit for an electric motor.  Is there any way to do this reporting the current to the arduino?
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Hi,
I have been trying to find out how to create a solid state current limiting circuit for an electric motor.  Is there any way to do this reporting the current to the arduino?

The concept is simple. You measure the current being drawn by the motor and if and when if exceeds a predetermined value you remove the power going to the motor. The details of how you do all that depends on what the motor's type, voltage, and current range is, how it's being powered and controlled, etc and details abound. Some DC motor driver modules and circuits have this detection built in and either automatically shut-off or give a digital flag signal that a user can read and take appropriate action steps.

Lefty

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Hi Lefty,
Thanks for the reply. 
The motor will likely be between 12V and 18V with a 3A or 4A current.  It will be a brushed DC Motor.  I am planning on putting everything on a custom PCB so deciding whether I want to integrate everything to reduce costs or us pre made controllers.  I am leaning towards a single integrated module though.  I was thinking of using MOSFETs for control of the motor, a thermistor for temperature, but I am not sure how to check current.
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