Electrical Engineering Asked by UnoBianconero on January 20, 2021
I want to use a 12V 15A switching power supply for a 12V 10A DC motor which has about 9A start current and 6A no load current, I also want to add a push button switch for on and off function to use it and by that, each time motor stops it’s gonna draw huge current from supply and I’m going to add some caps on to the curcuit; so my questions are:
thanks
DC motors don't use start capacitors. You want a reservoir to keep the supply from sagging.
Use dQ = C * dV, or C = dQ/dV.
If you need 10A for 2 seconds, dQ = 20 Coulombs.
If you can tolerate a 2V sag in the supply voltage, dV = 2V.
Then C = 10 Farads.
Double check your specs though : if the no load current is 6A and the rated current is 10A, you probably mean 90A for the start current. Which would mean 90 Farads in the above.
And remember you can't just switch on a supply to a 10 Farad capacitor...
Answered by Brian Drummond on January 20, 2021
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