|Nov 02, 2013, 08:54 PM|
Im trying to figure out how to power all my escs once they arrive.i have 4 motors and im trying to make a lead line to the battey.how many wires do i need to run from the battery to power the escs.i heard one esc can power the rest of the escs but i still have to power the motors ......how many wires would i need to run to the battery for 4 motors and escs.
|Nov 03, 2013, 12:01 AM|
United States, FL, Orlando
Joined Oct 2013
TL;DR: ESC's need direct battery power to run the motors and 5v to run the onboard circuitry. Most ESC's have a BEC to provide 5v to themselves and optionally provide 5v to other components.
The important thing to understand is that ESCs will (usually) have 2 power circuits in them: It will power the motor with battery power (the ESC part) and it will convert some battery power down to around 5 volts to power the electronics (the BEC part).
Not all ESCs come with a BEC (Battery eliminating circuit), in that case you will need a separate BEC to supply 5v to the esc's, radio, flight controller, servos, etc.
Assuming your esc has a BEC, you will have something like the following connections:
Battery + and - to each of the esc's main inputs.
On the other end of each ESC, there will be 3 wires to connect to a motor.
There will be a 3 wire servo connection in which throttle signal goes into the esc and 5v power flows out of the BEC into the rest of the electronics through the shared power bus found on flight controllers and radio receivers.
Because of this shared power bus, you only need one sufficiently large BEC to run all the electronics. If your ESC's each have switching BEC's you should only use one as they will all fight eachother and get hot. Disable the BEC's by removing/cutting the red wire on all but one ESC servo connector. That way, each switching BEC only powers the ESC it is attached to except for the one BEC which is also powering all the other electronics.
On the other hand, linear BEC's can work together well enough, though some still recommend disabling all but one. I didn't disable any on my tricopter and it works fine. Check your ESC to see if it has switching/linear BEC to determine what you need to do.
Lastly, not all flight controllers have a completely shared power bus. On the KK2 for example, Motor connection M1 shares power with the receiver connectors and powers the KK2 itself while M2-M8 are only connected to them self but not M1. Check the specific wiring on your flight controller.
|Nov 03, 2013, 03:03 AM|
Joined Jul 2013
The most simple power distribution is to run a single pair of wires from the battery connector, then split those to 4 to run to each ESC, all soldered together.
Easiest would be to use a ready made cable, like http://hobbyking.com/hobbyking/store...out_Cable.html - then you get connectors to each ESC as a bonus, and of course you have to install those on the ESC side too. If you're new and might rebuild something there, it can be a splendid idea. Like, you may later realize you want to add 12V leds to the system...
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