Hub Motor Making New Noise - Aniioki A8 Dual Motor

[boba7523]

Hi All,

I have the Aniioki A8 Dual Motor with about 400 miles on it. This motor has metal planetary gears instead of nylon. I know noises from the hub motor is normal, but today, the front motor started making 2 new noises.

• The first noise sounds like a slight chirp that only happens at around 28-30 mph and then disappears (~9, 14, 31 second mark)
• The second noise sounds like a "ohm" sound whenever I let off the throttle and only happens at mid to higher speed also (~11, 16, 36, 40 second) mark. Otherwise, the motor sounds normal.

I've uploaded a YouTube video of the sound. When I touched the motor through the plastic case, it was barely warm. Below is the specification.

Maybe this is normal, but I just wanted to inquire others here just in case so I can catch problems early. Appreciate your help!

 

[Toptnhunter]

That does not sound happy. Since it suddenly developed, I would assume it is not normal and the sounds are associated. Does it sound metal to metal or an electrical hum?

 

[biknut]

I wouldn't worry about it as long as it runs ok. My new BGX 1500w geared hub motor makes worse noises than yours, and it runs like a bat out of hell. Maybe after it gets more miles it will quiet down a little. Metal gears are noisy, that's why plastic ones were invented in the first place.

 

[Annieolnie]

I had a midrive that started making a slightly lesser noise then that, but similar. Oddly, it started at about 400 miles. When I opened it up, it turned out the factory hadn't greased the gears at all. I would open it up and see how well it is greased.

 

[boba7523]

Thanks guys. I actually cleaned and replaced the factory white lithium grease with Lucas Oil 10301 Xtra Heavy-Duty Grease which is rated at NLGI-2 at 100 miles. Not sure if this is the right oil because it's for high speed bearing but not electric motor... It was definitely nowhere near as thick as the white lithium grease.

Do you guys think that grease works for metal planetary gears?

I just bought the Mobil SCH 100 which is also NLGI-2. I'm thinking I should replace with this...... Thoughts?

 

[Annieolnie]

I've used "Lucas Red n' Tacky"because it's what I have for clutch bearings. I can tell you that the Lucas is thicker than any lithium grease I have. If the grease you are using is even thinner than that, then this might be your problem.

 

[boba7523]

I've used "Lucas Red n' Tacky"because it's what I have for clutch bearings. I can tell you that the Lucas is thicker than any lithium grease I have. If the grease you are using is even thinner than that, then this might be your problem.

If there was an issue with grease, wouldn't it affect all RPM range? Either way, I'm going to replace it with Mobil SCH 100 just to be safe and report back if noise disappears.

 

[Annieolnie]

While your in there have a look around. Good luck.

 

[Hozer]

2 things . .

#1. I would pull apart the motor. Check to see if any of the magnets have come loose or may have some debris in the motor it self.
#2. I would check your controller that go to your hub motor. Check to see if the controller is getting very hot. If so looks like it maybe the controller.

Note:
The reason I stated both number above is on my bike my front hub motor was making a loud noise. I too thought it was the front hub motor only to find out it was my front motor controller! See pic!

FRONT-Controller hosted at ImgBB

Image FRONT-Controller hosted in ImgBB

ibb.co

Hope That Helps

 

[Rawly Old]

Hi All,

I have the Aniioki A8 Dual Motor with about 400 miles on it. This motor has metal planetary gears instead of nylon. I know noises from the hub motor is normal, but today, the front motor started making 2 new noises.

• The first noise sounds like a slight chirp that only happens at around 28-30 mph and then disappears (~9, 14, 31 second mark)
• The second noise sounds like a "ohm" sound whenever I let off the throttle and only happens at mid to higher speed also (~11, 16, 36, 40 second) mark. Otherwise, the motor sounds normal.

I've uploaded a YouTube video of the sound. When I touched the motor through the plastic case, it was barely warm. Below is the specification.

Maybe this is normal, but I just wanted to inquire others here just in case so I can catch problems early. Appreciate your help!

View attachment 16120

I'm very leery of dual motors. I can't see how they stay in sync & it's just
something else to go wrong.

 

[Hozer]

I'm very leery of dual motors. I can't see how they stay in sync & it's just
something else to go wrong.

It's real simple. Here is how my Keteles K800 Dual 2000 Watt Ebike works. The rear hub motor is always on. Now on the Front Motor I have a switch that I can turn on and turn off the front motor. Example: If I am going up a very steep hill or road I just turn on the front hub motor and off I go. It's kinda feel like when you put the pedal to the metal. Maybe not that much but you can feel the boost! LOL

 

[Rawly Old]

I wouldn't worry about it as long as it runs ok. My new BGX 1500w geared hub motor makes worse noises than yours, and it runs like a bat out of hell. Maybe after it gets more miles it will quiet down a little. Metal gears are noisy, that's why plastic ones were invented in the first place.

Agreed, they get broken in & quiet down. Clean & re-grease at 2000, it'll be better than new. Not ruling out other possibilities though.