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How can one 14.8V battery supply 14 volts to 4x 4s(14V) motors?

Posted by Gabriel Sölvi Windels on January 8, 2015 at 2:27pm

I must be misunderstanding something, but when I see motors such as 

http://www.hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=41623

It says that the needed voltage is 4-6s, that is 14.8V minimum.

Now, how can a 4s battery, supply FOUR 14.8 Volt motors?

Wouldn't the required voltage need to be 4*14.8=59Volts?

I must be misunderstanding something, because splitting a 14.8 Volts into four different paths, using a power distribution board, should theoretically create 4 paths with 14.8/4=3.7Volts each, which is far below the required voltage for the four quadcopter motors.

I hope someone can clear this up for me because my lack of understanding is getting on my nerves

thanks,

-Gabriel

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Replies

  • Richard January 8, 2015 at 3:58pm
    That's just basic Electrical Theory 101.
    • Gabriel Sölvi Windels > Richard January 8, 2015 at 4:35pm

      Yep, was switching up the effect of a parallel power supply on Voltage to Amps, brain glitch.

  • Marco A Assfalk de Oliveira January 8, 2015 at 3:06pm
    The motors, via the ESCs, are connected in parallel with the power supply, so they all receive 14,8 V (1) at their terminals, while dividing the current supplied by the battery among themselves. At a given voltage, the energy capacity of a battery then can be roughly measured in A.h, which allows one to determine if the battery (and ESCs) are rated for the desired current required by the motors.

    Your calculations assume a series connection.

    (1) Maximum average voltage, the actual average voltage is varied by the ESCs using a method known as Pulse Width Modulation, and is roughly proportional to the resulting motor speed, and hence thrust.
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