Complete Teardown of the QS138 90H Motor | The Best Cheapest Motor?

Complete disassembly the QS138 90H motor. This motor was damaged due to a fire and I decided to take it apart to have a look at the design and construction. Definitely some interesting results!

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Some more stats I forgot to cover in the video:
of turns in the stator coils = 50
Coil wire diameter is ~0.5mm - I think that's 24 AWG
Phase wires are comprised of two coils so 100 total strands = 4 AWG

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0:00 Intro
1:06 Removing the bolt
1:30 Removing the sprocket
2:05 Inspecting the shaft & sprocket key
2:26 Removing the front face
3:30 Removing the front face bearing
3:48 Inspecting the damaged windings
4:30 Inspecting the stator design
5:42 Pole pairs disambiguation
6:15 Removing the back face
7:35 Looking at hall sensor wires
8:02 Removing the hall sensor cover
8:41 Inspecting & removing the hall sensor
9:50 Removing the back face from the bearing
10:26 Removing the back face bearing
10:40 Separating the rotor from the stator
11:30 Inspecting the rotor design
12:40 Inspecting the coil windings from the rear side
13:17 Disassembling the phase wires pass-through
14:00 Closer inspection of coil windings
16:07 Cutting the coil windings for removal from the stator
17:17 Separating the coil windings from the stator
18:20 Closer look at bare stator and damage from fire
20:13 Thermistor removal
21:02 Summary

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