Comments (0) When I went for my AH1N1 vaccination back in 2009 I saw this bike in the middle of the mall. This man was offering his service to modify normal bike in crazy looking sounding moped.
Chain tensioner
I wonder the time it takes to get that sprocket spinning perfectly straight.
The guys working on the Phoebus project, which is a 100% electric car, are testing these batteries. I was able to grab some pictures and informations on them. The Phoebus project is a final engineering project done by mechanical and electrical engineering students at the University of Sherbrooke. I know a few guys on the team.
Those are LiFePO4 lithium battery. They are very big. They have a nominal capacity of 14Ah and a continuous discharge rate of 10C ( 140Ah) which is not a lot.
Yep, those are big! Will not fit in my scooter! They are too wide for my scooter.
Model number is F014 and it is manucfactured by EIGbattery.
The maximum discharge rate of those battery is very low, 10C. Normal RC lithium battery are now in the 30 to 40C. That is 40 time the nominal capacity, so when you have 5Ah that is 40*5=120Ah continuous discharge!
If I choose the EIG battery, I would use the C008 , C015 or F010. The other models are very long (20cm) and large (15cm).
I just realise that I forgot to post this. This is my scooter with the original motor.
I was able to reach 40,3km/h!! That is 25Mph!! It was scary on my bad street road. When I came back of that ride, I also fell down at 34km/h, I pooped a wheelie and fell!! haha
2391W!
Here are other shoot of the moment one of the 3rd wire of the motor got unplug. Here is the peak of current.
3270W
That is 143AMP! That is alot of current! That did not help, the wires got hot and melted a little bit.
A few days ago, I worked on the motor bracket. I also decided to make it bigger. I made is bigger because on the original bracket, I had one of the motor screws that was under a spacer. I had to remove the spacer to remove the screw. Since it is bigger, I have not problem now.
First I had to draw everything on the computer, I printed it to be sure I had the perfect fit. This is the new scooter. Since my bracket is bigger I had to drill new holes in the frame. I took the piece of paper on glued on the frame.
I wanted to be aligned so I turn on my LED flash light.
Here are the new holes.
I did the same thing here, I glued down the drawing and punch out the holes.
Those are the bottom and top of the bracket.
The only concern I have is that I am wondering if I am loosing the natual air flow of the motor by putting the motor bracket right in front of the motor vent holes. I was thinking of drilling holes but need to be sure I will not make my new bracket fragile on the edge.
On the right side of the spacer you can see washers, there are 3 washers, they help me to adjust the depth of the motor so I can aligned the belt.
I am thinking of adding this fan to cool down the motor. I bought this 7 blades turbine fan on hobbyking. It is a little bit big put should do the job. I will need to machine a bracket to hold it to the motor.
I might try other solution like a 5V PC fan.
Today I tested the motor and it works! I test the 30$ motor and at high speed, it was making this very high pitch sound. I will probably need to adjust timing and frequency directly on the brushless controller.
I am concerned about the heat generated by the motor while free running. It was running at full speed with no load for a 2 minutes and it get warm. So a fan will be needed to ensure the magnet health.
Steps before first run
I few post back, I said I wanted a specific motor on hobbyking. It was still backorder so I decided I had to order a motor and live with it. I order the Turnigy C5065-350.
Here it is
That motor cost me 30$, so I bought 2. The original Rimfire motor is discontinued and was 99$
The first thing I did was take it appart! I knew that cheap motor like this one had to be inspected. I read that from different reviews on hobbyking that the majority of motor have there magnet falling off (un-gluing).
After seen the above picture , I realise that I would probably need to add some epoxy!
On the left, is the 99$ motor and the right is the 30$ motor. That blue thing is glue, it looks like a epoxy, it is not like that around the entire motor. Only 1/4 of the motor. The 99$ motor has slot so the magnet slide in those slot. I do not have them with the cheap motor. Those slot and glue provide good strength.
On the left is the original motor.
While playing with that motor I realise something amazing! The part with the wire, the stator, can fit perfectly inside the brand new 30$ motor!
This is the stator, on the right you have the old one that I brooke, so there is not wire in it.
This is the old bracket, I will need to machine a new one. I am working on it right now.
The big difference between both motor is the quality of the magnet. (I think) When I remove the stator from the rotor, the 99$ motor offer a big resistance when I try to pull it out. I did not get the same type of resistance with the cheap 30$ motor. It was WAY more easy! I was suprised. The air gap seems to be the exact. (Airgap is the space between the magnet and the stator (coil)) So I guest the magnet are cheaper. I have no tools to measure the magnetization of the magnet. Maybe I could find that at my University… (email sent)
BTW I ordered the real motor I wanted from hobby king! The TGY AerodriveXp 46 SK Series 50-55 580Kv / 1580w.
I am going back to finish up a new motor bracket. Can’t wait to ride the new scooter. I will also modify the scooter: add 1,5 feet to the scooter. More on that later.
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