Problems

[unknownhero55]

i have a novak goat 3s esc and a 18.5 turn balistic crawler brushless motor. the problem is its like the motor is locked up but it still spins roughly . did i fry the motor or is there a fix???? thanks for the help in advance!!

[unknownhero55]

so out of 30 some people no one has a clue????????????

[Meatwad]

It's not something that can be diagnosed from a simple forum post. But here are some ideas... Try motor on a different esc or vice versa. Take apart the motor and check for any debris. Check motor bearings.

[SMR 510RR]

Sounds like a sensor issue, make sure your sensor wire is firmly plugged into both ends...Might be time to try a new sensor wire.

If that doesnt work we will need more information than its locked up but spins roughly.

[unknownhero55]

thanks guys ill try that tonight

[Ty@Tekin]

Sounds like your motor is shorted, if it feels harder to turn than normal then most likely it's done. Shorting the windings is the same thing as applying brakes, so if you've got brakes while not hooked up to the ESC that's bad.

[unknownhero55]

that kinda sounds like what it is cause when i turn it in a full circle it stops like 6 times

[DudeWalker]

Originally Posted by unknownhero55

that kinda sounds like what it is cause when i turn it in a full circle it stops like 6 times

That's what brushless motors are supposed to feel like off-power. If they don't have six stops, THEN something is wrong. What is it doing when you try to run it? What you are describing, if you are talking about stuttering on-power, sounds like a bad sensor wire to me. Try a different sensor wire and report back.

[unknownhero55]

when i ran it in the chassi it would try to move but just stop right away. wen i took it out it would do the same unless i helped it along and it sonded rogher and the 6 stops feel rougher than usual , this is so hard to describe

[KBrog]

You probably melted the stator. Good news is you can buy another from Novak.


http://www.shopatron.com/products/pr...6.0.0.0?pp=10&

[masonis1]

Originally Posted by unknownhero55

that kinda sounds like what it is cause when i turn it in a full circle it stops like 6 times

Suppose to stop. THats the magnet

Sent from my SPH-D700 using Tapatalk 2

[Duuuuuuuude]

Originally Posted by DudeWalker

That's what brushless motors are supposed to feel like off-power.

Not all brushless motors are like that.

[ik632]

I have brushless motors that you clearly have to turn the motor hard and it has several steps when rotating. I have others that turn as smooth as a brushed motor when not hooked up. It all has to do with the magnet size/strength and the motor design/build.

I'd pull the ends off, clean it up, put it all back together and see if it's still not working correctly. The Novak is a pretty beefy motor so it probably should feel like there are steps or stops when you turn it. Again, I don't have one so I can't say for sure.

[Duuuuuuuude]

Originally Posted by ik632

I have brushless motors that you clearly have to turn the motor hard and it has several steps when rotating. I have others that turn as smooth as a brushed motor when not hooked up. It all has to do with the magnet size/strength and the motor design/build.

A good strong brushed motor will be notchy too.


Motors designated with turns (17.5, 13.5, etc) are typically wound like this and will feel notchy when you spin them. They are wound similarly to a brushed motor.



Motors designated with kv ratings are typically wound like this and feel smooth when you spin them. Notice the copper looks like it was wadded up and epoxied into shape.

[ik632]

Nice post Duuuuuude, that explains a lot.

[Duuuuuuuude]

Originally Posted by ik632

Nice post Duuuuuude, that explains a lot.

I do what I can.

Bear in mind that is a simplified, basic explanation for easy understandability. It does not apply to every motor style by all manufacturers.

[SMR 510RR]

Are you sure that you have the phases correctly wired between the ESC and motor? Try running it without the sensor wire plugged in and report back what happens.

[DudeWalker]

Originally Posted by Duuuuuuuude

A good strong brushed motor will be notchy too.


Motors designated with turns (17.5, 13.5, etc) are typically wound like this and will feel notchy when you spin them. They are wound similarly to a brushed motor.



Motors designated with kv ratings are typically wound like this and feel smooth when you spin them. Notice the copper looks like it was wadded up and epoxied into shape.

Oh yeah... Sensorless (rated Kv) motors tend to feel real smooth. Sensored have the six stops per rotor rotation. He was asking about his Novak 18.5, so I was just talking about sensored.

Great explaination and pics!

Also, you can't run a sensored motor w/o the sensor wire? Correct me if I'm wrong?

A burnt up stator is easy to tell - the wires or connectors look burnt... It smells burnt. If it doesn't work with a new or different sensor wire something worse is wrong, and/or it could also be the ESC. Could also be that you have connected the motor wires out of phase like the guy above stated. Is this Novak system new to you - have you used it before w/o any problems?

[Meatwad]

Originally Posted by DudeWalker

Oh yeah... Sensorless (rated Kv) motors tend to feel real smooth.

The detent torque really depends on the design of the motor. Neu/castle motors for instance have quite a bit of detent torque, while something like the trx vxl3500 has almost none. And even some cheap hk3674 motors are somewhat tough to spin by hand.

Agreed that decent brushed motors have some too.

[Ty@Tekin]

Also depends on slotted vs slottless, plus there will be more than 6 spots depending on how many poles/slots the motor has. Not all of them will feel the same. If it feels hard to turn, or 'sludgy' then chances are the stator is shorted.