Vorteks Weird sound at low speed

[vortekyteky]

Hi, just put in new 2800kv motor and 130a esc, making different noise from the old setup. Is this normal? Running 3s. When up to speed the car is very quiet.

 

[slick2500]

Hi, just put in new 2800kv motor and 130a esc, making different noise from the old setup. Is this normal? Running 3s. When up to speed the car is very quiet.

Sounds like a sensorless brushless system. That is what is referred to as cogging. https://www.radiocontrolinfo.com/brushless-motor-cogging-explained/

 

[vortekyteky]

The

Sounds like a sensorless brushless system

The old system was so much quieter

 

[slick2500]

The

The old system was so much quieter

Yeah different kv and can size.

 

[islandlife]

Try a smaller pinion?

 

[vortekyteky]

Yeah different kv and can size.

do you know if the motor rotation is CW? I thought it was supposed to be CCW but then it drove backwards so I had to change to CW

 

[PrerunninF150]

Sensorless motors don't care which way they spin. What was the old Kv? Did you change pinion size? Sounds ok to me a slightly smaller pinion might lessen the noise as others have mentioned it is cogging a little bit. If it was me and your temps are good I wouldn't worry about it.

 

[Senton_Prime]

Sounds like the armature and magnets fighting to figure out what to do, cuz they guy in charge is lost!!

 

[King blitz]

Hi, just put in new 2800kv motor and 130a esc, making different noise from the old setup. Is this normal? Running 3s. When up to speed the car is very quiet.

Normal

 

[Just a hobby]

Hi, just put in new 2800kv motor and 130a esc, making different noise from the old setup. Is this normal? Running 3s. When up to speed the car is very quiet.

Smaller pinion gear is needed. Cogging is what your hearing.

 

[King blitz]

Before I send any of my sensorless cars out for a speed run I give it a slight push and I get no cogging at take off.

 

[vortekyteky]

Sensorless motors don't care which way they spin. What was the old Kv? Did you change pinion size? Sounds ok to me a slightly smaller pinion might lessen the noise as others have mentioned it is cogging a little bit. If it was me and your temps are good I wouldn't worry about it.

old was 3200kv, new is 2800kv. exact same 18t pinion, haven't ran properly yet, will be running on 4s when the batteries arrive.

Just so you know, I am also giving the thing the smallest possible throttle.

4s with more power would solve?

Sensorless motors don't care which way they spin

I had set it to CCW, turned it on and drove wrong way. swapped switch on transmitter which swapper the movement of the trigger, it was very fast in reverse but slow in forward. Changed to CW and now much faster going forwards. Assuming because I set reverse power to 25%?

 

[Senton_Prime]

old was 3200kv, new is 2800kv. exact same 18t pinion, haven't ran properly yet, will be running on 4s when the batteries arrive.

Just so you know, I am also giving the thing the smallest possible throttle.

4s with more power would solve?

I had set it to CCW, turned it on and drove wrong way. swapped switch on transmitter which swapper the movement of the trigger, it was very fast in reverse but slow in forward. Changed to CW and now much faster going forwards. Assuming because I set reverse power to 25%?

Not necessarily, I believe you are feeling latency more than anything + the slight cogging.. it's gonna cog a tad no matter what you do, will be more noticeable with more gearing, you run stock tx?

 

[vortekyteky]

Not necessarily, I believe you are feeling latency more than anything + the slight cogging.. it's gonna cog a tad no matter what you do, will be more noticeable with more gearing, you run stock tx?

yes stock tx

 

[PrerunninF150]

I had set it to CCW, turned it on and drove wrong way. swapped switch on transmitter which swapper the movement of the trigger, it was very fast in reverse but slow in forward. Changed to CW and now much faster going forwards. Assuming because I set reverse power to 25%?

The rotation should be changed in the settings of the ESC. On a sensorless motor you can also swap one of the motor wires. I am going to assume the same as you about the reverse 25% issue.