Ron189
March 12, 2018, 5:54pm
1
Hey!
I have a 300a esc and a 70a motor.
So I have two questions for you:
Can the esc and the motor work together? the amp of the esc is not too high for the motor?
If the esc works with the motor, so the esc would take 70a from the battery? or still 300a?
Thanks a lot!!!
Yes! ESC is ok if motor kv is within kv limit of esc. Make sure your 70a motor is up to the mechanical task it’s being asked to perform…
Ron189
March 12, 2018, 5:59pm
3
Thank you so much!
and what do you mean by " Make sure your 70a motor is up to the mechanical task it’s being asked to perform"
Sorry, my English is not too strong
The esc and the motor will work together, the question is how well… To answer that we need more specs.
Its the motor that decide how many amps are pulled (on regular esc, not vesc i think), so the esc will pull maximum 70A from the battery.
Edit: @MoeStooge was faster
1 Like
Use this tool. http://calc.esk8.it/ if your motor lacks the amount if watts it takes to push the weight your loading the motor at, it will burn up…
Ron189
March 12, 2018, 6:18pm
7
but on this tool i can only measure speed
Please tell us more about these parts or send some pics.
Ron189
March 14, 2018, 5:49pm
9
Is that helps you?
Flier 300a car esc
More motor info needed. 70a motor at what voltage will determine your watts or horsepower. For instance say a 500w motor(70a x 7.2v = 500w) will safely drive a 170lb vessle 12mph at wide open throttle. Gear it for 15mph and now it runs hot and has less applied torque at the wheel. Watts(HP) needs to exceed the load to determine what top speed you need to calculate so you don’t make magic smoke…
1 Like
Ron189
March 14, 2018, 6:48pm
11
Voltage: 12S Lipoly
RPM/V: 149KV
Internal resistance: 0.021 Ohm
Max Loading: 70A
Max Power: 2250W
Gearing: 1:7.8
Thanks a lot!!
Cobber
March 14, 2018, 6:51pm
12
wheel size is the lat bit for a roll out calc.
2250w I’d say 20mph would be a safe Target to start with. Monitor motor temps and shoot for 135 deg farenheit 160 tops…
He could surely go faster than that, right? You only start to pull around 2000w when nearing 50kmh, well that’s what I saw on a different post
1 Like
Ron189
March 15, 2018, 11:52am
15
the wheel size is 200mm
So, can I build this? is that ok? the motor would not burn or something?
Use the calculator tool above to achieve the mph I stated above using the equipment you have and it will be a safe starting point base line…
@MoeStooge @pat.speed
I do not think that hobbykings 2250W is correct. IMO they mislabeled that…
50,4V (12S) * 70A ~ 3500W
1 Like
3500w will get him to 30mph
KT torque per amp = 60 / (2 * pi * KV) = 0.064 nm/a
70a max recommended amps * 0.064nm/a = 4.486 newton meter max recommended torque
2250w max recommended mechanical power / 4.486nm = 501.56 radian per second max recommended angular speed at max recommended torque
501.56 r/s * 9.5492 rpm per r/s = 4789.5rpm max recommended rpm at max recommended torque at 70a
70a * 70a * 0.021ohm= 102.9w motor heating @ 70a
300a * 300a * 0.021ohm= 1890w motor heating @ 300a
Ron189:
the wheel size is 200mm
Diameter? If so that’s crazy big wheel.