[DC motor as dyno - measuring current]

I am undergraduate student and electrical engineer at a formula student team. I am doing a engine dyno using a DC motor in which I am getting the current output of around 400A which I am measuring through a shunt. But I want to get the output curve in terms of voltage, in which I am getting some difficulty as the current value is so high. So can you help me this

by AMAN598
May 14, 2019

@AMAN598 can you provide a schematic?

What is the load?

Can you measure the voltage across the shunt? Why are you saying there is difficulty because the current is high?

by mrobbins
May 23, 2019

can you be a bit more specific re what you wish to do?-- "output curve" Are you looking for a speed torque curve for the engine? In that case it's handy to know that for a dc motor with fixed field speed is proportional to generated voltage and torque is proportional to motor current. To get generated voltage you can measure terminal voltage with a voltmeter and you already have the current so you can calculate the generated voltage (terminal voltage - ir drop) . Let me know if this makes sense to you and I can go into more detail if necessary.

by Foxx
May 25, 2019

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