Ok… So been playing around with my dual 6734 190kv 10s build and have made a number of observations and would like ideas of better tuning perimeters.
I am using the Ack tool for ESC setup and have been very impressed with all the options. I currently have my board running 200mm slicks and gearing of 16x72 with 15mm belts. The board works great no belt slippage but real aggressive launch torque so much so that it jerks pretty hard on acceleration. I have PPM control type set to current no reverse brake, mapped throttle and using a expo- natural curve at -20. Motor and battery max current set at 60 and running sensor-FOC .
I also noticed the acceleration at launch was increased with tire pressure. I am running 50lbs as I like the stiff feel but think this may also be contributing to torque during initial launch.
Options I am considering:
Lower motor and/or battery max current - will I loose top end?
Keep lowering throttle gain?
lower tire pressure?
Where do think I should start to smooth out launch acceleration and preserve ride quality and top end?
All suggestions welcomed however could you please let me know…I could also pull some screen shots of configuration tabs if that would help.
I may be describing the action of the board poorly. If I am very careful with the handheld controller it will take off smooth but seems over sensitive and well a bit to aggressive…I just feel the board has to much low end torque. I can be doing 10mph and it just pulls real hard and still requires me to be careful with the controller.
In your PPM settings do you have a significant deadband? I’ve found that decreasing this as much as possible helps with startup jerking (does not affect cogging).
As long as your remote is sensitive enough, it should be picking up the low end of throttle fine.
Also, it definitely is not your motor amps. You are not pulling 40 amps from a gentle startup. The only time that would happen is if you are trying to gun it from the start, which it sounds like you are trying to accomplish the opposite.
I would set motor amps Max at whatever the motor is spec’d at. If the motor doesnt have a spec for that you can claculate it, an 8s max 2000w motor should have a Max of 60A. Simply W=VA
Maybe I misunterstood the thread, jerking and cogging is for me the same (but english is not my language ). What’s the difference?
@ksfacinelli the hall table looks fine.
Maybe this has nothing to do with your problems but in general the Battery Current Max should be lower or equal the Motor Current Max. So if you set 40A motor max then set 40A batt max or lower.
In this context cogging is when the motor rotation can’t keep up with the phase wire switching, which leads to the back and forth jerking we all know too well. That is a result of the motor being stalled.
What OP is experiencing is jerking on startup. He means that when he first pulls the throttle the board will try to go forward very hard and yank the rider forward unexpectedly. This is not a result of cogging, he is experiencing acceleration at low speed that is not corresponding to his trigger pulling.