Hub motor very HOT

[gustavo88py]

My freind a new hub motor and it gets too hot.


I've already tried it with 2 fadriver and 1 votol.
The hub motor runs very well but it gets too hot compared to the previous hub motor

 

[gustavo88py]

when I accelerate it in the air

 

[neptronix]

What's the model of motor and how much power are you sending to it, max?

 

[amberwolf]

Does it actually get hot to the touch, in the same amount the controllers report? Or is it just what's shown on the readouts?

If even unloaded operation heats it up that much, then either the temperature sensor is not correctly calibrated, or the motor is not correctly setup in the controller. (phase/hall combination, hall angle/timing, kV, inductance, resistance, number of poles, etc...one or more parameters incorrect).

if you've used multiple different controllers to operate it with the same results on each, with all their different autosetup/learn/etc routines, it's more likely that the temperature sensor itself is either faulty or not the type the controllers are expecting.

 

[gustavo88py]

What's the model of motor and how much power are you sending to it, max?

maximum 12kw short time
The previous hub was 2000 and heats less

 

[gustavo88py]

Does it actually get hot to the touch, in the same amount the controllers report? Or is it just what's shown on the readouts?

it is impossible to have your hand on it.

 

[gustavo88py]

How could I test if the motor is not actually 48v or 60v?

 

[amberwolf]

it is impossible to have your hand on it.

Do you mean it is enclosed inside something completely, so that you can't touch it at all, even when it's not spinning?

If so, that would be a reason for it to get too hot, as it needs outside airflow on the casing at minimum.

 

[neptronix]

Sounds like your motor is not up to it's rating, or this is a low efficiency type that creates way too much heat when pushed.
Most motos will take 3x the power for a short time, but continuously, won't do much above their nominal rating.

Would recommend dialing down the power or continuous speed.

 

[amberwolf]

How could I test if the motor is not actually 48v or 60v?

A motor doesn't really have a voltage. It has a kV, meaning how many RPM it spins per volt applied.

Some give that in RPM/volt, some give it as how fast it spins a wheel of a certain size for a given battery voltage, and some don't bother to give it at all. Some label a voltage but don't give any other info which makes the whole rating meaningless and useless.

It's a fair bet that any of the bruhsless motors could handle up to a couple hundred volts for it's insulation; whether it can survive spinning however fast that would make it, I don't know.