156B Week 6
Overview of Status of Analysis, Design, Fabrication, Tests, etc.
We have finalized the dimensions and sizes for the stator and fluid reservoir pieces that need to be 3D printed.
We should be ready to print the motor this week, and hopefully have an assembled prototype soon after.
Unfortunately, we have had very limited contact with our sponsor(s).
We have not heard anything from Terry in at least a month.
James has been out-of-state taking care of a family member that had COVID-19, so contact with him has been extremely minimal.
From what we have heard from James, he went ahead and purchased a couple gallons of mineral oil.
He didn't inform us what exactly he bought, so we don't have any specifications on it.
He also went ahead and made the final decision on switching to mineral oil without discussing with us, so we are assuming that means using Fluorinert is no longer an option.
We are still waiting to get on update on where the sponsors are with making the electromagnet coils. They haven't given us any update on their progress.
Accomplishments from Previous Week
Continued to change CAD model to accommodate new features
Slightly thicker stator
Counterbores for bolt heads
Additional bolt holes to guarantee clamping force for o-ring
Made final decisions on hardware to be used
Stainless steel bolts around edge of stator/reservoir interface
PEEK screws for bolts along the radius of the permanent magnets of the rotor (to avoid heating from induction)
Started researching the electrical/controls aspect of this motor
Had meeting with Ed and Steve about motors. Told to contact Steven Roberts to talk more about electrical motors.
Goals for Next Week (list names after each item). Use specific and measurable objectives.
Finalize hardware purchase list and order components needed for assembly (Kenan).
i.e., nuts, bolts, o-ring, etc.
Finalize CAD and prepare it for printing (Nick)
Begin printing motor, help purchase remaining hardware (Bijan)
Start fabricating motor (Kiernan)
Sponsor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
N/A (we have not been able to meet with our sponsor)
Instructor Comments from Last Meeting and Actions Taken to Address these Comments (indicate date of comments and if via email or in person)
4/27 in-person:
Consider other liquid cooling options - Mineral oil has a low flash point and could explode - Glycol - HFE 7500, inert fluid like fluorinert but less expensive
Our sponsor has unfortunately already ordered the mineral oil and seems to be set on it.
Consider tolerances for the inserts
Yes, we're still toying with the sizing and making sure its perfect.
Comments from Other Students in the Class (indicate date of comments and if via email or in person)
4/27 via Zoom:
Will you have a back up to o-ring in case of leaks?
Yes, we plan to use a sealant if o-ring isn't sufficient
Risks and Areas of Concern
We don't know what mineral oil was purchased or the properties of it, so the flash point of mineral oil is a big concern.
Resources or Information Required but not Available
N/A
Schedule
Goals for next week are:
Begin test printing by 5/6
Finalize the CAD by 5/10
Finalize the hardware needed by 5/10
Begin manufacturing by 5/10
Budget (list amount spent and amount remaining)
Total Budget
$5,000
Spent
$3.00, fluid plug
$23.50, PETG
$28.00, 1-1/4 pipe tap
~$200, Assembly hardware
Remaining
$4,745.50
Progress on Report and Webpage
Report first draft has been submitted.
Webpage has been slightly updated.