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Old 10-20-2012, 10:44 PM   #1
DannyShadow
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Default Question about powering a motor

So I was looking at this motor:

KD A22-20L:
Kv: 1000rpm/V
Battery: 2~3S
Current: 6~21A
Max (A): 25
Max voltage (V): 11

And I was hoping to pair it with this battery:

FlightPower LiPo EONX Lite 2S 7.4V 2500mAh 25C

So on to my question: what is the range of voltage that can power the motor? The specs for the motor says that the max voltage is 11 V so that's the ceiling. The battery gives out 7.4 V so I was wondering if this is enough to start the motor? What's the minimum voltage required to start it? And finally, what's the best voltage?
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Old 10-20-2012, 10:48 PM   #2
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11v is really low - that is likely an error....

As long as you keep your amps in the range - you should be good.

3s LiPo will be no issue.

Mike
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Old 10-20-2012, 10:54 PM   #3
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Originally Posted by rcers View Post
11v is really low - that is likely an error....

As long as you keep your amps in the range - you should be good.

3s LiPo will be no issue.

Mike
It's a tiny motor, only 85 grams. Here's the link (since I couldn't post it before):
http://www.hobbyking.com/hobbyking/s...ner_Motor.html

So as long as I'm in the amp range, the motor will start no matter the voltage?
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Old 10-20-2012, 10:59 PM   #4
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First - it is out of stock so DON'T order it!

Second - tiny is relative. That is a 250w motor so it will easily be able to handle that voltage.

You can over volt a motor - I guess. But I am confident that 3s 12.6v won't hurt it a bit. When they say 11v that must be the nominal (depleted) capacity of the 3s pack. You will be fine!

But this one is in stock and might serve you better:
http://www.hobbyking.com/hobbyking/s...r_1020kv_.html



Mike
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Old 10-20-2012, 11:10 PM   #5
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Yeah, I noticed the backorder, haha. I'm not gonna buy anything yet, I'm still planning the items and just making sure that what I'm going to use will work with each other.

Thanks for the recommendation! It says its for 3D parkflyers and I was hoping to build a slowflyer. Would it still be good enough?
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Old 10-20-2012, 11:23 PM   #6
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It will be fine for a slow flyer. 3D requires MUCH more power than you are looking for.
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Old 10-21-2012, 12:29 AM   #7
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Since the motor specification says "Battery: 2~3S" (read as 2S to 3S) then yes it will run on the 2S battery you were suggesting.

Steve
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