Motor Shields
- Smile Khatri
- Justin Liu
Big Project | Project | Project Manager |
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Pegasus 2 | Motor Shields | @Alison Thompson |
Task Description
Design and 3D print a motor mount with a small shield to protect the motor in the event that the motor strikes the ground.
Historically, there have been no issues with motor damage when Pegasus has tipped over. However, motors are expensive and we must ensure proper motor protection is in place in the event that an accident occurs.
This task was inspired by UTAT UAS team at AEAC 2024. As shown below, they had shields around the motor.
Constraints
Constraints | Written By | Append Date |
|---|---|---|
Must be lighter or identical in weight to the current motor mounts. | @Smile Khatri | 2024-06-01 |
The shield must not obstruct the propellers or the motor when the motor is operating. | @Smile Khatri | 2024-06-01 |
Must use existing mounting holes on the carbon fiber arm. | @Smile Khatri | 2024-06-01 |
Relevant Contacts
Subteam | Contact | Contact Description |
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Assignees
Assignee | Asana Task | Date |
|---|---|---|
@Justin Liu | link to asana task assigned | Date assigned |
Task Progression/Updates
Author: @Justin Liu Date: Jun 12, 2024
First Design
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Not very creative, literally copied off U of T’s design. The more I think about it, the more I wonder how much damage this shield can protect the motor from or how effective would it be.
There is 1 mm tolerance between the walls of the shield and the outer wall of motor.
Assuming solid (100% infill) PET. Each shield weighs about 40 grams.
That’s a third more than the current mount of 30 grams. This can be cut down by reducing infill if needed.
Personally don’t recommend decreasing infill as the shield walls are only 2.5 mm thick
( this file is not on PDM at the moment (Jun 12) I am having trouble with PDM)
Author: @Justin Liu, Update Jun 19, 2024
Added tolerance to the shield inner diameter and reduced thickness of bottom piece by a bit.
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My PDM is down still currently. So I zipped a pack and go. Please try downloading the .zip from this page
Author: @Justin Liu, Update #2 Jul 1, 2024
About the need of for this shield, I do feel this shield would be beneficial at protection scratches and minor impact at low altitude crashes, may also reduce soil/debris from contacting coils. Would like to give the shield a test print.
Forgot to mention in the last update, but the inner wall was made to have a 2.5 mm clearance to the motor outer wall.
2.5 mm wall thickness is in my opinion pretty rigid, don’t think walls will snap easily.
Based on feedback given from all commenters, I opened 2 doors for wire. These doors are 45 degree to the axis of carbon fibre tube. Doors have a width of 13 mm.
Thought about ways to fix bullet wires. My attempt: added 2 close M5 holes (diameter 5.2 mm) on the side, stick a long screw or dowel (about 5 cm or longer) in, and zip tie the wires to the screw/dowel.
I could not make any accommodations for heat dissipation, yet. I want feedback or test data before opening more holes for thermal performance.
Again, sadly, PDM has divorced me, so I’ll send the drop the file here and on discord.
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Author: @Justin Liu, Update #3 Jul 14, 2024
Based on feedback and measurements taken
Added fillet to Carb-fib tube brackets for better smoother installation
Enlarged hole for bullet wires based on measurement.
reduced dowel hole to 3.2 mm meant for tying down dangling wires.
The file below is still SolidWorks 2023 version. If a next update exist, it will likely be Solidworks 2024.
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