What determines what amp ESC's used with Motors?

[genesc]

Is it the total amps pulled by all motors?

Thank You

Gene

 

[Malik112099]

You have 1 ESC per motor. The ESC should have a higher amp rating than the motor it is controlling. Example: http://www.hobbyking.com/hobbyking/..._2206_2150KV_Motor_The_34_Baby_Beast_34_.html That motor has a 10A max rating. The ESC should be fine if it is at least 12A so that you have some wiggle/safety room of 2A.

 

[Bartman]

Like Malik said, the ESC is rated for the motor that it is controlling. Keep in mind that motors will usually be at about 60% of their max output with occasional periods spent at or near max output. If a motor's max power output draw about 30 amps then the motor might be at 18 amps most of the time. I'm saying this because the tendency is to buy ESC's that are very overrated for the max output let alone the lower partial output. But also keep in mind that our ESC's don't usually see a lot of cooling airflow so a 30A ESC for a motor that draws a max of 30A isn't good either.

A 30 A ESC is good for a motor that draws about 20 to 25 amps max. I don't know of any rules of thumb for sizing ESC's, most of it is common sense once you understand the issues involved.

Bart

 

[genesc]

Thank you guys, that explains things. Boy!, there is allot to learn..

So I am to assume that on a Sunnysky 2212 13 980kv that a 30amp ESC would be fine?

Specification:
Short shaft, multicopter version of the Sunny Sky X2212 980KV Brushless Outrunner for 2-3 LiPo cells.
Model:X2212-980KV
KV (rpm/v): 980
Non-load current: 10V/0.3A
Max. Amps: 18A
Lipo Battery (cell): 2S-3S Li-poly
Weight: 56g
Length: 30mm
Diameter: 27.5mm
Shaft Diameter(mm): 3mm
​

Gene

 

[Malik112099]

30A ESC would be fine for that. I am running Sunnysky 2212-9 1400kv motors on these 30A ESCs: http://www.buddyrc.com/dys-simon-k-program-30a-multirotor-esc.html