Hello,
I have a problem. For school we have to make a project in the form of a robot or something similar.
We want to make a miniature hovercraft and we have bought 3 engines.
2 to make it move forward or spin and 1 to get it airborne.
Problem : all motors work on 6V, the 2 steering motors require 4.5A and the motor to get it up in the air requires 9A. So we have a reasonable problem finding a battery for this.
We did some searching and found a battery that can supply 11Ah, so we planned to switch the 2 steering motors to 1 battery and the others to 1 battery as well.
The question now is how do I know for sure whether this battery can actually deliver 11A because this is quite a lot. The battery is made to light up a lantern (I suspect one of those yellow ones you see at road works).
This is the battery:
http://www.digikey.be/1/1/457667-battery-s-heavy-duty-6v-lantern-1209.html
Please respond here or via email,
thanks in advance.
Geoffrey
typhoon_geof@hotmail.com
Answer
If you look at the specifications of your battery on the manufacturer’s website, you will see that the battery has an internal resistance of about 1 ohm. The maximum current that the battery can supply is therefore 6A (6 volts across a resistance of 1 ohm) and then your motor has not yet been switched on. So you will have to look for something with a lower internal resistance. Lead batteries usually have a much lower internal resistance.
Answered by
Professor Walter Lauriks
Physics Acoustics
Old Market 13 3000 Leuven
https://www.kuleuven.be/
.