[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
2 days, 19 hours ago

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
1 day, 1 hour ago
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