PROJECT STATUS 01-30-19 | eDirtBike

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Project Status

Week of 01-30-19

Project is: ON TRACK

Although we have run into a few setbacks, primarily in the circuit design, we are still on track to be completed by the deadline.

Issues / Extra progress from last week:

One issue we have run into since last week is finding an affordable and reliable source for the batteries
Another issue we have run into is realizing how much more complex the circuitry for the motor driver is than anticipated

Accomplished this week:

Ordered and began testing some of the different components for the motor driver circuit

Completed CAD modeling of existing KX65 components

Started bike rebuild
- Sanded and painted the frame
- Rebuilt fork seals and changed oil
- Replaced swing arm bearings
- Replaced linkage bearings

Finished a concept for the battery pack
- Reconfigured the 18650 battery cells for better access to stock engine mounts
- Batteries will be sealed inside a water resistance housing
- Machined or Waterjet from 6061 Al alloy
- 3D printed prototype battery pack frame and fit checked okay

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Replaced seat cover
Weld repaired existing footpegs
Powder coated footpegs and suspension linkage

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Battery Testing:

tested all 4 batteries purchased on Ebay, advertised as 3500mAh.
Qty 2 batteries tested at 3300mAh and QTY 2 batteries tested at 2000mAh

Parts Ordered

48V Brushless DC motor
Front drive sprocket, 420 chain pitch
Hand twist throttle potentiometer
13S Battery Management System (BMS) **Received 1/28**

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Goals for next week:

Continue working on the motor driver circuit
Start writing code for the eBike controller
Redesign a modular battery rack
build a test battery pack
coordinate with Jeremy Cornwall to use the Randolph campus waterjet
Source aluminum plate needed for parts
Verify round stock for spacers, turned on lathe at Williston campus

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