mickyd
10 W
Greetings. Newbie to the forum today.
Wondering if any of you have experience diagnosing and repairing a VERY whiny BBS02 motor. Here's a video that compares the sound of my motor vs. my buddy's. NOTE: To rule out the main drive gear or nylon gear, they were removed in the video. That left just the motor spinning in its bearings.
https://youtube.com/shorts/XY7hkXcgps4
My motor still runs very strong and has been for a month or so, and ~200 hard MTB miles since the noise got louder. At higher RPM's, full throttle, its embarrassingly LOUD. The whine is not real obvious when in the higher gears with less motor RPM's.
Luna Cycle suggested buying a new motor core. I was tending to agree until I saw the following FAQ on the Bafang website https://bafang-e.com/oem-area/service/faqs/ under the section "Reason for motor noise and vibration?". Now I wonder if it could be an electrical noise caused by the controller, or possibly noise from the rotor bearings????
The Bafang FAQ states.....
"There may be two kinds of motor noise: mechanical noise and electromagnetic noise.
Mechanical noise:
Bearing failure
Excessive gear friction or gear failure
Rotor imbalance or poor gear positioning due to construction inaccuracies
Water or other ingress into motor housing
Resonance of motor and frame
Electromagnetic noise:
The main reason is bad matching of motor and controller. A sine-wave current from the controller is better than a square wave, and induces less noise. "
Any help / comments / thoughts appreciated.
Wondering if any of you have experience diagnosing and repairing a VERY whiny BBS02 motor. Here's a video that compares the sound of my motor vs. my buddy's. NOTE: To rule out the main drive gear or nylon gear, they were removed in the video. That left just the motor spinning in its bearings.
https://youtube.com/shorts/XY7hkXcgps4
My motor still runs very strong and has been for a month or so, and ~200 hard MTB miles since the noise got louder. At higher RPM's, full throttle, its embarrassingly LOUD. The whine is not real obvious when in the higher gears with less motor RPM's.
Luna Cycle suggested buying a new motor core. I was tending to agree until I saw the following FAQ on the Bafang website https://bafang-e.com/oem-area/service/faqs/ under the section "Reason for motor noise and vibration?". Now I wonder if it could be an electrical noise caused by the controller, or possibly noise from the rotor bearings????
The Bafang FAQ states.....
"There may be two kinds of motor noise: mechanical noise and electromagnetic noise.
Mechanical noise:
Bearing failure
Excessive gear friction or gear failure
Rotor imbalance or poor gear positioning due to construction inaccuracies
Water or other ingress into motor housing
Resonance of motor and frame
Electromagnetic noise:
The main reason is bad matching of motor and controller. A sine-wave current from the controller is better than a square wave, and induces less noise. "
Any help / comments / thoughts appreciated.