3D printed outrunners

[ron_van_sommeren]

With videos

• www.3ders.org/articles/20161022-prolific-maker-christoph-laimer-at-it-again-with-3d-printed-led-focused-gadgetry-certain-to-impress.html
• www.rcgroups.com/forums/showthread.php?2886791-3D-Printed-Halbach-Array-Motor
• www.instructables.com/id/600-Watt-3d-printed-Halbach-Array-Brushless-DC-Ele

• www.proto-pasta.com/pages/magnetic-iron-pla
• www.blackmagic3d.com/Magnetic-PLA-Filament-p/bm3d-175-mag.htm

[ron_van_sommeren]

Christopher's YT channel
www.youtube.com/channel/UCv3hNzy4n-onHRorHGK0_ig

600 Watt, 3d-printed, Halbach Array, brushless DC electric Motor (6 min 26 sec)

Another 3D-printed outrunner by Christoph Laimer

3d-printed Halbach Motor - Update, Tuning, Testing (and sending it to FliteTest) (6 min 28 sec)

[1BOHO]

No conversation here on it it seems . Nevertheless great testing/work being done there

[Maeg]

Hello Ron.
Could you please explain how to measure Torque with scales?
Is it applicable to heli motors?

[ron_van_sommeren]

Yes, applicable to heli-motors. To all motors.

power (watt) = torque (N·m) × angular_speed (rad/s)
torque = force (F) × lever_length (m)
angular_speed = 2π × rpm / 60 (rad/s)

The motor base can rotate freely. Don't let mass of stick and wiring have effect on measurement.
It's the same principle as the the Elektro Modell diy dynamometer (although an eddy current brake is better than a prop brake)
www.aerodesign.de/peter/2001/LRK350/index_eng.html
→ Bottom of page
→ EM 4/2001 Performance Measurements on Electric Motors

More
Dynamometer (wikipedia)

A compilation, plus theory
several diy test rig designs - RCG

Vriendelijke groeten Ron