Have We Gotten Electric Motors Wrong for 150 Years?

Comments · 638

• TE

  @TehPwnerer · 5 months ago

  &quot;Trusting is good but controlling is better&quot; probably best translates as &quot;trust but verify&quot;<br>a saying you will come across quite frequently at least in tech industry

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• DA

  @Danji_Coppersmoke · 5 months ago

  I visited the CMotive site, and they have an efficiency PDF document. From that, their tested efficiency is around 88%. When cross-comparing the induction motor + gear and the permanent magnet motor, they compared them in a very weird way. They use the inductor&apos;s total loss as a 100% reference for cross-comparison with others, but do not mention the induction motor&apos;s nominal efficiency. <br>First, 88% is low efficiency. PMM can easily exceed 90%, and a single-stage reduction gearbox is usually 98% efficient. <br>Second, in comparison, if the PMM they use has lower efficiency then 88%, that is a pretty sucky motor.

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• MI

  @Milosz_Ostrow · 5 months ago

  (<a href="https://www.youtube.com/watch?v=lIpAS6OLJDw&amp;t=118">1:58</a>) Narrator: &nbsp;&quot;Left Hand Rule&quot;. &nbsp;Screen diagram: &nbsp;Shows drawing of right hand.

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• LE

  @LexK137 · 5 months ago

  There are so many low-speed applications for motors, especially in &quot;soft robotics&quot; or anything that need to interact with humans. Door motors, mobility devices, elevators, escalators, etc.<br><br>Plus high-torque low-speed industrial applications like tractors, cranes, garbage truck mechanicals, and I&apos;m guessing even many pumps and compressors could all benefit from high torque and low speed. I&apos;d love it if a high-efficiency compressor motor for a heat pump could be designed to use very low speed motors so they don&apos;t whine like banshees.

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• DE

  @dekutree64 · 5 months ago

  Everyone who dabbles in electricity should build a Wimshurst machine. And a Bonetti machine to go with it, which is several times more powerful so you can really feel the electrostatic forces (sort of like peeling velcro apart), but can be difficult to get started without the Wimshurst. It&apos;s especially interesting to dismantle the machine and pull the discs apart just after running it. The electric field blooms outward and can be felt quite strongly with your arm hair, which behaves like iron filings in a magnetic field :)

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• KR

  @krakhedd · 5 months ago

  Talking about electric motors, and in your intro you say, &quot;....see if it has the potential to replace....&quot; *And you didn&apos;t even crack a grin at your masterful punnery*!!!

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• BL

  @BlackHoleForge · 5 months ago

  I appreciate you putting the numbers in the bottom for your sources. Sometimes the subject is so intriguing, that you want to go read the actual papers.

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• SU

  @surkh · 5 months ago

  <a href="https://www.youtube.com/watch?v=lIpAS6OLJDw&amp;t=754">12:34</a> well, i do see electrostatic potential there

  3

• ER

  @Erik_Swiger · 5 months ago

  I&apos;ve spent my whole life trying to understand the intricacies of magnet electric motors. Now, I&apos;m exicted to learn about a whole new field of motors.

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• MA

  @martyb3783 · 5 months ago

  Fascinating stuff. &nbsp;Great video. &nbsp;Well done!

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• HA

  @HangarQueen · 5 months ago

  <a href="https://www.youtube.com/watch?v=lIpAS6OLJDw&amp;t=118">1:58</a> Whoops, describing the left-hand rule while the graphic is a right hand.

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• AN

  @anullhandle · 5 months ago

  Over 99% is currently the record for large industrial motors. Still this could have application in overall system eff.

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