japperrrr
1 mW
First of all, let me introduce myself to you guys.
My name is Jasper and I am 21 year old. For the last three years I've been studying Architecture at the Eindhoven University of Technology (Netherlands). Recently, I also started with a bachelor Automotive (Faculty of Electrical Engineering) at the same university. Almost 3 years ago, I bought an electric scooter. The public transportation here is not that fast and I need to travel 15 km to get to the university, so I drive my scooter on a daily basis. I really enjoy driving it and I have never had major issues with it. Until yesterday... Hopefully some of you guys can recognise my problem and help me to solve it.
Also, sorry for the huge amount of text. I made a summary at the end, but I think it's necessary to give this much information as often the solution is to be found in the details.
I'm driving a Novox C50 scooter with a 3500W hubmotor and a matching controller. I replaced the lead batteries with Winston(a.k.a. Thunder Sky) LiFe(Y)PO4 cells. It runs on 51.2V nominal, 16 cells. So far, so good.
About two weeks ago, I noticed that when I drive away from a standstill, the scooter sometimes "shocks" softly one time before accelerating. First I thought that this was not a problem, until recently when the scooter suddenly had less torque (it felt like 1/3rd of torque was gone). It didn't make any strange noises, it simply had less torque. After turning it off and on a couple of times and rotating the motor by hand, the problem disappreared.
For about a week I have been driving it daily without any problem: I drove it to the university every morning and back home at least a few hours later.
Yesterday I drove my scooter to the supermarket where I was inside for approximately than 5 minutes. When I wanted to drive home, the scooter turned on but had no (zero!) torque at all. Only when I turned it on and gave throttle, it would give one really light shock. I took the wheel with the motor off the ground and tried the same things I had tried before when I experienced low torque, but this time turning the scooter off/on and rotating the wheel by hand did not fix the problem.
Then, suddenly, the wheel started spinning when there was no load on it. But when I tried to drive the scooter, the same problem reoccurred. I had no other choise than to push it back to my home.
About one hour later I tried to drive the scooter, and quite surprisingly: I could drive without any problems at all. I drove it for about 300 meters and then I turned the scooter off and back on. Guess what?? Same problem, zero torque again.
So, summarized:
- Used to drive perfectly for months
- Started to give tiny shocks when driving away from stand still
- Lost about 1/3rd of torque for half an hour
- Lost all torque for half an hour
- The scooter drives from a "cold start", but when I turn it off and back on, it does not drive anymore.
- I don't have any idea on how I could determine the problem, as it only appears after a "warm start"
Extra information:
A few months ago the controller short-circuited (strong resistance on the motor), and I received a new controller from the manufacturer. The old controller had been damaged by water entering the controller through the cable harness (design flaw). When I installed the new controller, I changed the position of the carble harness, such that water can not get inside anymore. Together with the fact that there is no unusual resistance on the motor, I assume that the current problem is not caused by water damage.
The throttle is controlled by a hall sensor. Also, the scooter has a built in break switch and side stand switch. But again, I don't see how any of this could cause the problem I am experiencing.
I replaced the standard halogen light bulb with a xenon system, which seems to influence at least the speedometer when I on my lights. The speedometer and xenon light both work on 12V (from a seperate transformer), so I don't think this affects the controller in any way.
If needed, I might be able to buy second hand original parts to replace possibly broken ones instead of repairing them.
If any extra information is required, please ask!
My name is Jasper and I am 21 year old. For the last three years I've been studying Architecture at the Eindhoven University of Technology (Netherlands). Recently, I also started with a bachelor Automotive (Faculty of Electrical Engineering) at the same university. Almost 3 years ago, I bought an electric scooter. The public transportation here is not that fast and I need to travel 15 km to get to the university, so I drive my scooter on a daily basis. I really enjoy driving it and I have never had major issues with it. Until yesterday... Hopefully some of you guys can recognise my problem and help me to solve it.
Also, sorry for the huge amount of text. I made a summary at the end, but I think it's necessary to give this much information as often the solution is to be found in the details.
I'm driving a Novox C50 scooter with a 3500W hubmotor and a matching controller. I replaced the lead batteries with Winston(a.k.a. Thunder Sky) LiFe(Y)PO4 cells. It runs on 51.2V nominal, 16 cells. So far, so good.
About two weeks ago, I noticed that when I drive away from a standstill, the scooter sometimes "shocks" softly one time before accelerating. First I thought that this was not a problem, until recently when the scooter suddenly had less torque (it felt like 1/3rd of torque was gone). It didn't make any strange noises, it simply had less torque. After turning it off and on a couple of times and rotating the motor by hand, the problem disappreared.
For about a week I have been driving it daily without any problem: I drove it to the university every morning and back home at least a few hours later.
Yesterday I drove my scooter to the supermarket where I was inside for approximately than 5 minutes. When I wanted to drive home, the scooter turned on but had no (zero!) torque at all. Only when I turned it on and gave throttle, it would give one really light shock. I took the wheel with the motor off the ground and tried the same things I had tried before when I experienced low torque, but this time turning the scooter off/on and rotating the wheel by hand did not fix the problem.
Then, suddenly, the wheel started spinning when there was no load on it. But when I tried to drive the scooter, the same problem reoccurred. I had no other choise than to push it back to my home.
About one hour later I tried to drive the scooter, and quite surprisingly: I could drive without any problems at all. I drove it for about 300 meters and then I turned the scooter off and back on. Guess what?? Same problem, zero torque again.
So, summarized:
- Used to drive perfectly for months
- Started to give tiny shocks when driving away from stand still
- Lost about 1/3rd of torque for half an hour
- Lost all torque for half an hour
- The scooter drives from a "cold start", but when I turn it off and back on, it does not drive anymore.
- I don't have any idea on how I could determine the problem, as it only appears after a "warm start"
Extra information:
A few months ago the controller short-circuited (strong resistance on the motor), and I received a new controller from the manufacturer. The old controller had been damaged by water entering the controller through the cable harness (design flaw). When I installed the new controller, I changed the position of the carble harness, such that water can not get inside anymore. Together with the fact that there is no unusual resistance on the motor, I assume that the current problem is not caused by water damage.
The throttle is controlled by a hall sensor. Also, the scooter has a built in break switch and side stand switch. But again, I don't see how any of this could cause the problem I am experiencing.
I replaced the standard halogen light bulb with a xenon system, which seems to influence at least the speedometer when I on my lights. The speedometer and xenon light both work on 12V (from a seperate transformer), so I don't think this affects the controller in any way.
If needed, I might be able to buy second hand original parts to replace possibly broken ones instead of repairing them.
If any extra information is required, please ask!