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  • Author Author: manojroy123
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DC motor Load indicator

manojroy123

I have build a PCB cutting machine that cuts PCB and many other materials. The machine doesn't have a feature of indicating that it is trying to do high load work. Many times overloading work by the motor causes the connection wiring to burn. With micro bit, I wan't to build a Load Indicator so that I know when the machine is taking high load. So that the material could be avoided or speed can be reduced. 

  • Hi Manoj,

     

    Measuring current should meet your primary requirement, but also isn't the current related to speed? I think it's a linear relationship when the load is applied, you'll see the current increase almost linearly as the motor is loaded. At least for DC motors, I don't know what you're using.

    You'll get a ton of insight by measuring the current but for sure you could measure other things like actual RPM if you wanted to, but it's not as directly related to protecting your motor as a straightforward current measurement (or even a fuse - consider a resettable fuse). Also you mention connection wiring burning, that really needs replacing with more suitable wire.. It's a fire hazard if the wire cannot support the maximum load or has flammable insulation.

  • in reply to rsjawale24

    We even need an auto cut of feature if the motor get stuck even for that we need some amount of controlling feature. 

  • in reply to rsjawale24

    There are many more parameter that need to be considered like temperature of motor as well when dealing with DC motor. RPM is also one of the parameter that need to be taken care of while controlling the motor. Ammeter is just not sufficient to deal with the Cutter. You do need a custom solution to deal with the problem. My cutter can cut many material but the parameters need to be controlled to deal with it. So I am looking to build a custom solution. Current is just one parameter.

  • Maybe you can attach an ammeter and measure the current through the motor. High load means high power and higher current will be drawn by the motor.