this post was submitted on 25 Jun 2025
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Solarpunk technology

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Drastically increasing the efficiency of Ceiling Fans [50%] | Tech Ingredients (www.youtube.com)
submitted 1 month ago* (last edited 1 month ago) by ProdigalFrog@slrpnk.net to c/technology@slrpnk.net
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From a commenter under the video:

Summarized the measurements, with rough timestamps:

Stock blades (6:43): 1 m/s, 64.3 W,

simple airfoil (7:55): 0.8 m/s, 66 W

modern airfoil (9:12): 1.2 m/s, 64.5 W

stock motor no blades (13:49): 53.8 W

BLDC motor no blades (16:24): 8 W

BLDC stock blades (18:27): 1.8 m/s, 59 W

BLDC stock blades at reduced speed (19:35): 1.0 m/s, 27.3 W

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[โ€“] MysteriousSophon21@lemmy.world 1 points 1 month ago (1 children)

The energy efficiency difference is insane - 8W vs 53.8W at no load means BLDC motors use about 85% less power just to spin, which is why my electic bike can go so far on a single charge.

[โ€“] keepthepace@slrpnk.net 1 points 1 month ago

DC motors will tend to be optimal only at a set speed/torque whereas BLDC motors do need a microcontroller to be driven, but are able to optimize the flow in a much wider range. Coils in a DC motor are basically ON or OFF whereas they can ramp up in a BLDC depending on the speed.