E Bike vibrating from dead stop

[diebolo]

So I recently built a 1500W ebike from a kit from Alibaba and everytime I start from a complete stop, it makes this vibrating sound. Once I get going it only makes a normal humming noise and acts normally. It doesn't stutter and I feel like there is nothing wrong with it in terms of torque and power.

Here is a video of a start. As you can see, once I get going its very silent: https://www.youtube.com/watch?v=8eQDwkZEXeo

The controller and the motor came in the same kit and thats why I hooked up the 3 phase wires color by color. The hall sensor wires are all wired up to a 6 wire connector which in turn connects to a connector on the controller.

So should I be worried and rewire the hall sensor? Or is this normal?

The controller and the battery are in a metal case in the frame which is hard to open, so here is a photo during the build process of the inside, https://imgur.com/EkWYwtx , the most left two connectors (yellow and white) are the motor connectors.

 

[neptronix]

These basic DDs generally grunt a little from a startup, especially if not given proper amounts of initial current ( stock phase amp to battery amp ratio in the controller may not be appropriately tuned ).

If you had a hall sensor problem, the bike would be stuttering or doing other fun things after the initial startup.

 

[diebolo]

Ah thanks!
Is there anything I can do about the tuning? I have the KT-LCD3 installed but I have no clue about the meaning of these parameter settings.
It has these options, ripped from this manual: https://www.bizobike.com/uploads/5/7/0/9/57094291/handleiding-bizobike-kt-lcd3.pdf

P Parameter Setting
P1 Motor Characteristic Parameter Setting Mode
P2 Wheel Speed Pulse Signal Setting Mode
P3 Power Assist Control Mode
P4 Handlebar Startup Mode
P5 Power Monitoring Mode
C1 Power Assist Sensor and Parameter Selection Mode
C2 Motor Phase Classification Coding Mode
C3 Power Assist Ratio Gear Initialization Mode
C4 Handlebar Function Setting Mode 25
C5 Controller Maximum Current Adjustment Mode
C6 Backlight Brightness Adjustment Mode
C7 Cruise Function Setting Mode
C8 Motor Operating Temperature Display Mode
C9 Power-on Password Setting Mode
C10 Automatic Restore Default Setting Mode
C11 Attribute Selection Mode
C12 Controller Minimum Voltage Adjustment Mode

Or is this something that needs to be changed in the hardware of the controller?

 

[neptronix]

I don't know about the KT controllers parameters ( never used one ), but there are many threads on here about programming them.. use the google search option in the top right.

 

[fechter]

Your symptom sounds like mismatched hall/phase wiring. If one of the hall sensor signals was bad, it should trigger a fault message. Since you aren't getting this, I assume the hall signals are OK, but they may still be mismatched. Normally the colors should match between the controller and the motor, but it may actually need to be swapped around.

Another possibility is one of the fat motor phase wires is just not making a good connection. Take apart the connector and closely examine the pins and sockets. Sometimes the contacts can slide back in the shell and it's not obvious from the outside.

If that all looks OK, I might suggest messing with the C2 Motor Phase Classification Coding Mode. No clue what this actually does, but sounds like it may relate to your problem. Make note of the original setting so you can put it back if you don't get an improvement.

If none of these pan out, you might have a bad controller.