Noise and vibration

[mellingford]

Hello everyone I have a Cyrusher XF650.On throttle and PAS it started making a loud noise and vibration and would stop and not start again, moving wheel backwards it would start again but with noise again, me thinking must be hall sensors if starting again in different positions, replaced hall sensor circuit, made no difference, on closer inspection the noise and vibration was coming from the area where the controller is situated in the downtube, removed the controller too see if anything was loose, tightened all the screws still the noise.There is no moving parts in the controller can't understand why it's making so much noise, will dismantle the controller and check Mosfets. What do you think?
Cheers

 

[amberwolf]

Motor cable damage (from a crash, etc) can cause wiring faults that can cause controlelrs to operate incorrectly. Normally that makes noise at the motor, not the controller, but if currents are high enough you could get vibration in electronics.

 

[mellingford]

Motor cable damage (from a crash, etc) can cause wiring faults that can cause controlelrs to operate incorrectly. Normally that makes noise at the motor, not the controller, but if currents are high enough you could get vibration in electronics.

Thanks for your reply, this noise is definitely coming from controller, it is 48v so think current on mosfets is causing noise and vibration,will know more when I take controller out cheers.

 

[mellingford]

This is a new one on me,noise coming from controller, I think one off the phases is down and it's running on 2 phase,it is an ac voltage on the motor phases,not sure how to test for voltage but have electric bike tester so will use that to try and confirm, trouble is connections are different ho well another problem. Cheers

 

[neptronix]

that's a good place to start.

 

[mellingford]

Hi everyone found fault motor blue phase down.Special thanks to Amberwolf for pointing me in the right direction. There was no signs of damage to the motor and hall sensor 9 pin plug,but the blue phase had no continuity, cut the cable back from the 9 pin plug and continuity on blue wire,looks like a pain rewiring back too coils so wil put a 5 pin and 3 pin connectors in place of 9 pin connector, few thing learned the controller is totally packed with silicone, you would probably have to cut open casing to get access, the hall sensor circuit has resistors and capacitors,surface mounted too small to do do anything with,found similar circuit but no resistors or capacitors,but does not seem to make any difference?,time will tell Controller priced at £100 and hall sensor circuit priced at £50 from Cyrusher website and £450 for new motor,will keep using my" heath robinson" fixes at them prices.Cheers