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Apr 25, 2006, 07:30 AM
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Johnnie Paul's Avatar
Discussion

ESC question: What is BEC...


Question: I have a CC Thunderbird 18A ESC, and it has a 3A BEC...What exactly is BEC and what does it do?

Johnnie
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Apr 25, 2006, 08:40 AM
cousin Dave
GLIDERGIDER's Avatar
BEC stands for battery ellimination circuit. This circuit powers the servos and Rx. 3 amps of electricity can be diverted from the motor to power the servos when needed. The BEC also has logic which senses the battery voltage, and at the low end of voltage, the BEC will shut down power to the propeller assuring the rx and servos with the last bits of electric power, and thus a safe landing. Hope this helps.
Dave
Apr 25, 2006, 09:03 AM
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Johnnie Paul's Avatar
Quote:
Originally Posted by GLIDERGIDER
BEC stands for battery ellimination circuit. This circuit powers the servos and Rx. 3 amps of electricity can be diverted from the motor to power the servos when needed. The BEC also has logic which senses the battery voltage, and at the low end of voltage, the BEC will shut down power to the propeller assuring the rx and servos with the last bits of electric power, and thus a safe landing. Hope this helps.
Dave
I was having the loose wire re-soldered to my ESC today and the technician asked me about the BEC, and I had no answer for him. Thank you Dave, your explanation helps alot.

ESC is fixed, so my Blu Plate will be flying at the next fly-in.

Johnnie
Apr 25, 2006, 04:00 PM
Fly long and land softly
Jim_Marconnet's Avatar
Quote:
Originally Posted by Johnnierkt
I was having the loose wire re-soldered to my ESC today and the technician asked me about the BEC, and I had no answer for him. Thank you Dave, your explanation helps alot.

ESC is fixed, so my Blu Plate will be flying at the next fly-in.

Johnnie
Nice to hear that's fixed and you're ready!

Nice to have a technician, in my case, that would be ME!

Jim of all trades, master of None!
Apr 07, 2008, 01:35 PM
Registered User
I have a basic question, and please excuse me for coming in late to this discussion.

Why do quadrotors require 300 Hz update rates for the motor speed? It seems to me that the PID control signal would be very noisy at this rate. Or, does this update rate provide more speed precision somehow?

Thanks!
Apr 07, 2008, 01:59 PM
One of the usual suspects
Vicarious's Avatar
Is that an African or European quadrotor?
Apr 07, 2008, 02:07 PM
customstandoffs
cmala's Avatar
I don't know that



Ahhhhhhhhhhhh
Apr 10, 2008, 11:11 AM
Fly it like you stole it..
Tram's Avatar
Quote:
Originally Posted by Vicarious
Is that an African or European quadrotor?
It's not a question of where he grips it! It's a simple question of weight ratios! A five ounce quadrotor could not carry a one pound coconut.
Apr 10, 2008, 11:38 AM
customstandoffs
cmala's Avatar
Bridgekeeper: Stop. Who would cross the Bridge of Death must answer me these questions three, ere the other side he see.
Bridgekeeper: What... is your name?
King Arthur: It is 'Arthur', King of the Britons.
Bridgekeeper: What... is your quest?
King Arthur: To seek the Holy Grail.
Bridgekeeper: What... is the air-speed velocity of an unladen swallow?
King Arthur: What do you mean? An African or European swallow?
Bridgekeeper: Huh? I... I don't know that.
[he is thrown over]
Bridgekeeper: Auuuuuuuugh.
Apr 10, 2008, 11:57 AM
Fly it like you stole it..
Tram's Avatar
Ah the better part is earlier on, waaaaay before he gets to the bridge ..
Apr 10, 2008, 12:23 PM
customstandoffs
cmala's Avatar
Are you saying coconuts migrate?
Apr 10, 2008, 01:14 PM
Fly it like you stole it..
Tram's Avatar
What? A swallow carrying a coconut?
Apr 10, 2008, 09:40 PM
Registered User
Stryder's Avatar
I fart in your general direction!
Apr 11, 2008, 07:59 AM
David
dleviner's Avatar
No, he said migrating coconuts.
Apr 11, 2008, 11:39 AM
Fly it like you stole it..
Tram's Avatar
Silllllllyy Englisssssshhhh Kiiiiiiiiiiiiiiiiiiiiii-niiiggggggggg-iitt!


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