recumpence
Member
The sync issue is an issue with your motor, not the controller.
When I first built my bike, it ran fine. But, it was geared for low speed. As I geared it up, I began seeing that motor screaching sound. That sound is the motor loosing sync with the ESC. However, this is not an ESC issue, but a motor issue. From the research I have done, it looks like the problem is primarrily with the AXI motor. Apparently, there is an issue with the 14 pole arrangement of that motor and the resonant frequency of the can resulting in that screach. With your gearing, I would guess your screach is occurring at about 10mph, right at the sweet spot for beginning a run up a hill or towing a trailer.
Anyway, I changed motors. Now I am running a Plettenberg Terminator 30-8 heli motor. That motor has no issues like the AXI. However, it is $1,000+!!! Plus, it is actually less efficient than the AXI (fewer mile per charge). It also draws ALOT of current because it trys to run up at 6,000 watts! So, I have blown two controllers at this point. I did some more research and found that my wiring (18 inches of 12 guage wire) is woefully inadequate for my needs. So, I am moving to dual runs of 10 guage and reducing my wire length to 8 inches instead. I am also installing a bank of caps before the ESC to eliminate any remaining line inductance. Beyond that, I have been pulling 150 amps through my HV110. So, I ordered a Castle Creations Hydra HV240 boat controller. It should be better suited to this application with super high current like I am pulling (under hard accelleration).
So, back to your bike..................
It looks like the screach is something you will have to live with. This is indeed frustrating. It is the only motor that tends to encounter this. The large HXT outrunners seem to be imune to it as do many other motors. I wish I geared my bike up earlier to find this problem sooner.
Matt
When I first built my bike, it ran fine. But, it was geared for low speed. As I geared it up, I began seeing that motor screaching sound. That sound is the motor loosing sync with the ESC. However, this is not an ESC issue, but a motor issue. From the research I have done, it looks like the problem is primarrily with the AXI motor. Apparently, there is an issue with the 14 pole arrangement of that motor and the resonant frequency of the can resulting in that screach. With your gearing, I would guess your screach is occurring at about 10mph, right at the sweet spot for beginning a run up a hill or towing a trailer.
Anyway, I changed motors. Now I am running a Plettenberg Terminator 30-8 heli motor. That motor has no issues like the AXI. However, it is $1,000+!!! Plus, it is actually less efficient than the AXI (fewer mile per charge). It also draws ALOT of current because it trys to run up at 6,000 watts! So, I have blown two controllers at this point. I did some more research and found that my wiring (18 inches of 12 guage wire) is woefully inadequate for my needs. So, I am moving to dual runs of 10 guage and reducing my wire length to 8 inches instead. I am also installing a bank of caps before the ESC to eliminate any remaining line inductance. Beyond that, I have been pulling 150 amps through my HV110. So, I ordered a Castle Creations Hydra HV240 boat controller. It should be better suited to this application with super high current like I am pulling (under hard accelleration).
So, back to your bike..................
It looks like the screach is something you will have to live with. This is indeed frustrating. It is the only motor that tends to encounter this. The large HXT outrunners seem to be imune to it as do many other motors. I wish I geared my bike up earlier to find this problem sooner.
Matt
