strange loud vibration sound in acceleration

[lifepo4ever]

hi everyone i just finnish my build fews days but i was busy to do some testing but today i made a ride and i noticed my motor 9c if not feeling good with the phases of hall sensor because i heard a loud vibration in the motor if I push the trottle to full acceleration

So anyone, if you have the same set up like me can you send please your combination

lyen 12 fets controller last model + 9c rh205

phase:
controller side : blue motor:green
:green :blue
: yellow :yellow
hall:
controller side: yellow Motor:yellow
:green :blue
:blue :green

 

[aroundqube]

sometimes the color swap is not the same for both the phase and halls. the best self help info for determining the wiring combinations can now be found in the ES Wiki

 

[bowlofsalad]

For as long as I have had the motor(9c clone from em3ev), I have noticed there is a certain strange and louder vibration that occurs while accelerating through a certain speed, I don't know the cause.

Anyway, I've added a picture, this is the end coming from the motor. I don't know if it will help, but the motor and controller both came from em3ev.

 

[dogman dan]

9c to lyens has always been swap blue and green for me, on both halls and phases.

YY, GB, BG Same for both halls and phases.

Since you are doing the same, I'd be looking for the bad connection in a plug.

 

[pendragon8000]

I get something simalar and i assume its a resonation of phase frequency to resonant frequency of the hub. through about 15km/hr.

 

[lifepo4ever]

thanks everyone i will upload a video so we can compare if the sound is normal but i don't think its normal

 

[Ypedal]

what volts / amps are you pushing ?

9C motors do make a buzz at all times but at high power they complain a bit more at a certain rpm.

 

[John in CR]

hi everyone i just finnish my build fews days but i was busy to do some testing but today i made a ride and i noticed my motor 9c if not feeling good with the phases of hall sensor because i heard a loud vibration in the motor if I push the trottle to full acceleration

So anyone, if you have the same set up like me can you send please your combination

lyen 12 fets controller last model + 9c rh205

phase:
controller side : blue motor:green
:green :blue
: yellow :yellow
hall:
controller side: yellow Motor:yellow
:green :blue
:blue :green

Did you have reasonable acceleration? If so, don't go messing with phase/hall combinations. With a false positive (motor spins, but bad wiring combo, a 9C will have little torque. Different motors make different noises, and it's generally more pronounced under heavy acceleration, especially the first few revolutions from a stop. What is the no load current at WOT? That's the sure way to tell your wiring is correct.

 

[dogman dan]

Uhh, how much amps and volts? By 3000w a 9 c puts out quite a howl as it winds up. But I was thinking in terms of a strange noise, thinking in terms of a stutter, or chatter.

But a turbine like Ziiiiing sound, that's normal. ZZZZZZZZT. 8) Should feel very smooth, and giddy up fast. If it's stuttering it would be far from smooth.

But loud is quite normal for a hopped up hubmotor.

 

[dogman dan]

This vid, in between the wind noise, gives you a sample of the zzzzt sound a 9 c makes on 72v 40 amps.

http://www.youtube.com/watch?v=Y_Yi5-nTfmQ

 

[lifepo4ever]

what volts / amps are you pushing ?

9C motors do make a buzz at all times but at high power they complain a bit more at a certain rpm.

are you doing ? its a 12s lipo look at my video

 

[lifepo4ever]

hi everyone i just finnish my build fews days but i was busy to do some testing but today i made a ride and i noticed my motor 9c if not feeling good with the phases of hall sensor because i heard a loud vibration in the motor if I push the trottle to full acceleration

So anyone, if you have the same set up like me can you send please your combination

lyen 12 fets controller last model + 9c rh205

phase:
controller side : blue motor:green
:green :blue
: yellow :yellow
hall:
controller side: yellow Motor:yellow
:green :blue
:blue :green

Did you have reasonable acceleration? If so, don't go messing with phase/hall combinations. With a false positive (motor spins, but bad wiring combo, a 9C will have little torque. Different motors make different noises, and it's generally more pronounced under heavy acceleration, especially the first few revolutions from a stop. What is the no load current at WOT? That's the sure way to tell your wiring is correct.

video is there i have about 1.21 amps no load

 

[lifepo4ever]

This vid, in between the wind noise, gives you a sample of the zzzzt sound a 9 c makes on 72v 40 amps.

http://www.youtube.com/watch?v=Y_Yi5-nTfmQ

look at my video please thanks

 

[lifepo4ever]

http://www.youtube.com/watch?v=g96X22si9lg&feature=youtu.be

sorry my english still very bad ! but you can hear the sound !

no matter if I set the CA low or hi amps i have this strange sound

 

[Ypedal]

Nothing wrong with motor and controller.. all good..

Disconnect ca and teat on road..

 

[lifepo4ever]

Nothing wrong with motor and controller.. all good..

Disconnect ca and teat on road..

did you heard the sound at 1:40 to 2:00 of the video? because at the beginning of the video you don't heard anything special

 

[dogman dan]

Nothing heard that isn't normal.


Motors grunt some under load, like at start up. Controllers might also buzz a bit under heavy stall conditions. Some identical motors grunt more than others. Some hit a magic vibration at a certain rpm, and will start to sing a bit, ringing the motor cover like a bell. Then you hear a sound like somebody humming.

All sounds good to me, go ride and have fun.

 

[John in CR]

Wow! If that's what 9C's really sound like and it makes that sound while riding too, they're even bigger POS's than I thought. Mine never made a sound like that, but it was the old style and I ran it as a mid drive. The covers had bearings so poor that I hesitate to call them bearings, and the covers were way out of balance. I changed the bearings and balanced the covers before ever running it. I don't think they would have made that noise though. I can't imagine what would make that kind of noise in a DD hubbie.

 

[999zip999]

O.k. I ride my 2810 on the beach and it takes a toll on it. The whines like most 9c and clicks with the spokes. I tighten the spokes many times they do have beach crust on them and creek. So I put a drop of oil on he crosses of the spoke and it has quiet down a lot. I know the spokes have been tighten many times but it the crug on the spokes making some of the noises. I don't think there is a noise less 9c over time.

 

[John in CR]

999zip999, did you listen to his video? The motor was making usual motor noises, but then it made some horrible vibrating sound like it hit some harmonic in a wobble that suddenly tried to make the thing fall apart. I'm at a loss as to what could possibly cause it to make that noise in a DD motor.

 

[999zip999]

Yes and I think it could be the bearing to start with. Maybe a bit of dirt under the bearing seat in the cover ect. When it was made or wobble in the axle. You would need to crack open to get a clue. I didn't find the noise till I open the motor put the stator in a small plastic bucket with one cover on and sprun the cover above the bucket. The plastic v-shape of the bucket held the stator with the one cover on and above the bucket. The sound resanoated and happen to hear the bearing noise clearer it was on the freewheel side and that side does collect more sand and dirt as I know this fact. Yes JohnCr just talking about one of the five noises in my 2810 beat motor. It's one of those resuce motors from Meth for 150.00 also got a 3525 for 150.00 both laced. I do think they got pissed or something before I got them. Click click whrine hheee. Want to get the inside noises out first then put a real rim and spokes on them next.
Remember these are rat bikes.

 

[lifepo4ever]

Yes and I think it could be the bearing to start with. Maybe a bit of dirt under the bearing seat in the cover ect. When it was made or wobble in the axle. You would need to crack open to get a clue. I didn't find the noise till I open the motor put the stator in a small plastic bucket with one cover on and sprun the cover above the bucket. The plastic v-shape of the bucket held the stator with the one cover on and above the bucket. The sound resanoated and happen to hear the bearing noise clearer it was on the freewheel side and that side does collect more sand and dirt as I know this fact. Yes JohnCr just talking about one of the five noises in my 2810 beat motor. It's one of those resuce motors from Meth for 150.00 also got a 3525 for 150.00 both laced. I do think they got pissed or something before I got them. Click click whrine hheee. Want to get the inside noises out first then put a real rim and spokes on them next.
Remember these are rat bikes.

its a brand new motor and i will wait at winter to open it or keep it like that

 

[999zip999]

I just ride with the noise and hope it goes away. With 2500 miles at 3000 watts and 2 plus yrs. It's great motor.

 

[dogman dan]

I still don't know exactly what he's trying to show. One sound, right after it he says "right there". I thought that was a sound from something else near the camera mike. It could be a momentary stutter. You can easily get such a stutter from a phase wire making contact, but poorly. At some point at full throttle, two phases get full power, and one is getting much less.

The normal sound I hear is freewheeling, some of that out of balance wheel making the bearings go wa wa wa, spokes in the wind, and the high pitched humming warbley sound of the motor itself, ringing the covers.

Some of my 9c motors have been very quiet, others noisy as hell with the humming. It could be the notoriously poor bearings makes the diff.

 

[lifepo4ever]

I still don't know exactly what he's trying to show. One sound, right after it he says "right there". I thought that was a sound from something else near the camera mike. It could be a momentary stutter. You can easily get such a stutter from a phase wire making contact, but poorly. At some point at full throttle, two phases get full power, and one is getting much less.

The normal sound I hear is freewheeling, some of that out of balance wheel making the bearings go wa wa wa, spokes in the wind, and the high pitched humming warbley sound of the motor itself, ringing the covers.

Some of my 9c motors have been very quiet, others noisy as hell with the humming. It could be the notoriously poor bearings makes the diff.

dogman its because you don't hear it lool !! you getting old! i know what is a freewheel sound ,a humming sound , the sound i talk is the same like wrong phases connection but a little bit lower