Recently I have been spending far to much time doing research for this summers E-Trike project. As such I thought it was time to clear my head by laying out the whole plan as clear as possible. So here it is.
The aim is to take a variation of GreenSpeeds GT3 folding trike that belongs to a friend and turn it electric. This is the same trike as used in the trike light project.
Once converted it is hoped that it will have a range of approximately 60km when driven at 30km/h. It will be geared to have a top speed of 60km/h. As this is intended for the daily commute its not going to be built completely for power and performance. However, with 4kW at its dispose it still have an incredible amount of power available for its weight. Total weight when complete should be around 25kg, but this is a very rough estimation.
To achieve this I will be using Matt Shumaker’s single stage ‘eDriver’. Needless to say its almost a work of art. The drive works by taking the high RPM of the electric motor and reducing it to something more usable. By using this belt drive it is both quite, efficient and light weight. This drive has been specially designed for high end ebikes using RC (remote control) sized motors. These incredible motors, such as the Astro 3210 Brushless Motor pictured above, deliver huge amounts of power for their size and can still maintain 90%+ efficiency.
This will be bolted on to the trike just behind the seat using a mount also manufactured by Matt.
Once attached the drive will be connected to the left hand side of the rear wheel with a 0.25 inch chain. This chain will have a freewheeler on the drive end and a fixed disk break mounted sprocket on the rear wheel. The rear wheel sprocket will be much larger than the sprocket on the output of the reduction drive and as such acts as a second stage reduction. I am unsure of the rear wheel sprocket size yet as this need to be calculated with top speed in mind.
This setup is controlled by a Castel Phoenix HV-110 burshless motor controller.
This will take the raw DC power from the batteries and deliver it to 4kW motor in a way that it can use it. It also controls the speed and acceleration.
To control the bike will be a thumb throttle attached to the handle bar above the grip. A thumb throttle makes more sense in this case as the hand bars are vertical. To allow the rider to see the range left, the current battery status, speed and other useful information will be one of ebikes.ca’s cycle analyst’s. All the information is displayed on a weather resistant back lit LCD display.
Last but not least is the batteries powering this setup. I am still a little undecided as to what batteries to use at this stage. Currently my best bet seems to be four ZIPPY Flightmax 5Ah LiPo packs. The price is right and whats more, they can deliver the current require to make full use of the 4kW motor.
By using four of these packs in series and parallel I should have the voltage for good top speed and decent range.
Obviously there are many more components also required, but this is the key parts.
Over the coming weeks I hope to take delivery of these parts and get underway.