Question about motor and ESC limits

[the-gamer]

I have this 1/8 scale 4 pole 2350kv brushless sensored motor and a 1/8 scale 120A brushless ESC (suitable for sensored motors).

Thing is the ESC says it only takes motor up to 2050kv...

What will happen if I use this motor with this ESC?

Thanks in advance!

 

[allanon1965]

Its outside of the ESC capabilities...the ESC will most likely have a very short life running that motor..

 

[maslin]

I ran an ESC over it's rating, 4550kv on 3s. Then it caught on fire...

 

[Eric0424]

I have this 1/8 scale 4 pole 2350kv brushless sensored motor and a 1/8 scale 120A brushless ESC (suitable for sensored motors).

Thing is the ESC says it only takes motor up to 2050kv...

What will happen if I use this motor with this ESC?

Depends on the ESC and how far/hard you're pushing it, most cheap ESC's can't handle being pushed past their limits at all and are usually dead in a couple of months. Some are dead much earlier.

ESC's that are built better can handle going beyond their stated limits. I've been running a 4150kV motor on 3S with an ESC that has a 4000kV 3S limit. The ESC is actually a solid built unit from an RtR and I monitor motor and ESC temps closely, so it hasn't given me a bit of trouble in three years of service.

The safest thing to do is follow the manufactures recommendations when it comes to motor and battery limits unless you're prepared to sacrifice the ESC and possibly motor.

 

[the-gamer]

Maybe these helps:


ESC specs from the site:

Continuous Current - 120A
Burst - 760A
Resistance - 0.0003ohms
Suitable Motor Type - 4 Pole sensorless and sensored brushless motor
Battery - 2 ~ 6S Lipoly 5~18S NiMH/NiCd
BEC Output - 6.0V ~ 8.4V adjustable/3A

And on the box it says this: Suitable brushless motor: 4P SS 3674 3.5D 2050KV". It does not describe limits for different voltages. If in the site ESC specs was stated the motor kv limit, I would never have bought it...


Motor specs:

Motor Type - Sensored
Rotation Speed - 2350KV (RPM/V)
Power - 2400 Watts
Max RPM - 45000
Max Voltage - 19V
Max Continuous Current - 126A
Resistance - 0.0062ohm
Poles - 4P
Motor Length - 68mm
Motor Diameter with Fins - 42.8mm

I plan on only using 3S.

 

[Eric0424]

That motor will probably eat up the ESC pretty quick. It's a 40mm diameter (without the fins) by 68mm long 1/8 scale motor, the motor limit on the ESC is for 36mm diameter x 74mm long. The smaller diameter motors generally draw less current and produce less wattage compared to the larger motors.

If they're rating their ESC based on a 36x74mm then the 40x68mm will most like be more than the ESC can handle even if it were in the safe kV range.

 

[the-gamer]

Thanks for the info! "thumbsup"

I´ll just return the ESC.

 

[Olle P]

Depends on ... how far/hard you're pushing it, ...

That's the key issue!
Used for a slow crawler there should be absolutely no sweat, but if you use it for bashing/racing there will be trouble.