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« on: April 02, 2015, 12:53:29 AM »
Subbiya
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Hi,
can anyone please tell me whether the below esc suits or not

E-Max, Multirotor 4IN1 ESC(4*25A)
http://rcmumbai.com/index.php/product/multirotor-4in1-esc425a/

What is that BEC-TYpe Switch mode ? whether it supports flysky receiver. ? Also suggests me a low cost 4S battery. amp > (4*20).

Config:
Motor: sunnysky 2216-11 900kv(20A)
FC: APM 2.6
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« Reply #1 on: April 02, 2015, 02:19:53 AM »
gunnu
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yup you can use this 25A ESC with 2216 motor..
BEC stands for Battery Eliminating Circuit
BEC are of two type linear BEC and switch mode BEC. basics both act as voltage regulator..

1. linear BEC takes input voltage 11.1 (assumption) and reduces it to 6v by resistance and voltage regulator thats why it starts to overheat (I2R loss in electrical language)

2. switch mode BEC (Switching BEC) reduces the voltage by switching supply on and off several times (millions of times per second) thats why the won't heat up and are more efficient than linear bec..
(note- switching bec are not suitable for powering flight controller- red somewhere)
your flight controller will power your receiver not BESC(ESC with a built-in BEC)
regards
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« Reply #2 on: April 02, 2015, 09:51:07 AM »
Subbiya
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Whether Flycolor escs are good, can I go for it. I don't find any 30a esc (4s) @lowcost.

Flycolor 30 Amp Multi-rotor ESC 2~4S with BEC

http://www.vibranthobbies.com/multicopters/power-plant/speed-controllers-multi-rotors/flycolor-30-amp-multi-rotor-esc-2-4s-with-bec.html

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« Reply #3 on: April 02, 2015, 10:13:20 AM »
Himadri Roy
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Use Hobbyking's F30A great esc just flash it with simonk and it works wonders!!! Its available at vibrant hobbies!
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« Reply #4 on: April 02, 2015, 10:15:01 AM »
rcrcnitesh
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Re:

Are you a beginner if yes, i will suggest to buy a cx10 and learn flying on it.
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« Reply #5 on: April 02, 2015, 01:16:57 PM »
Subbiya
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can anyone comment on this

(note- switching bec are not suitable for powering flight controller- red somewhere). Is that true. ?
« Last Edit: April 05, 2015, 11:52:52 PM by anwar » Logged
 

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« Reply #6 on: April 02, 2015, 01:22:04 PM »
SK1701
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set acc_hardware = 1



I read that switch mode BECs are only a problem when connected in parallel on the same power bus. that is why people suggest cutting the red wires from 3 of the 4 ESC BECs. However, this is not needed for the kk 2.1.
SimonK or BLHeli firmware flashed ESCs are supposed to be better for multirotors. You can get them pre flashed or take the effort of flashing them yourselves.
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« Reply #7 on: April 02, 2015, 01:26:01 PM »
gunnu
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I saw people facing issue with flight controller when they are use switching bec to power flight controller...
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« Reply #8 on: April 02, 2015, 01:32:47 PM »
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set acc_hardware = 1



Which flight controller was this? Had they cut 3 of the red wires or not? Or was it a stand alone BEC?
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« Reply #9 on: April 02, 2015, 01:54:35 PM »
gunnu
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He was using ESC with switching bec naza v2 flight controller (with red wire attached) And he was facing arming issue.. Problem resolved after removing red wire from all the esc..
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« Reply #10 on: April 02, 2015, 04:20:37 PM »
Himadri Roy
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you can use your switching BEC to power a FC just add a capacitor(high capacitance) in parallel to the power line(between red wire of the BEC powering the the FC and GND(black wire))  Hats Off
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« Reply #11 on: April 02, 2015, 04:26:08 PM »
gunnu
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But I think capacitor will not filter harmonics. You need t-filter for pure DC output.
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« Reply #12 on: April 02, 2015, 04:45:20 PM »
Himadri Roy
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I think a capacitor might not be enough...Don't know much about t-filters...you can also try adding a ceramics caps(100nF) which are better in dealing with noise then electrolytic capacitor
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« Reply #13 on: April 02, 2015, 04:54:43 PM »
gunnu
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Actually capacitors stores voltage (don't act as filter alone) and inductor stores current ( both combined act as filter. Different filters are designed for different setup ( high pass , band pass, low pass etc)
But if you are using naza or apm then you don't need bec to power fc they have there own power source... Just remove red wires from all esc and fly...
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