August 21st, 2024

Electrostatic motors reach the macro scale

C-Motive Technologies has created a 360-watt electrostatic motor that improves efficiency by 30% to 100%, using sustainable materials and capable of driving industrial applications, with future models planned up to 3,750 watts.

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Electrostatic motors reach the macro scale

C-Motive Technologies has developed a prototype 360-watt electrostatic motor that challenges the dominance of electromagnetic motors. This innovation, co-founded by Daniel Ludois, aims to leverage the efficiency of electrostatic principles, potentially offering a 30% to 100% increase in efficiency compared to traditional motors. Unlike conventional motors that rely on rare materials, C-Motive's design utilizes aluminum, plastic, and fiberglass, making it more sustainable. The prototype achieves torque of 18 newton meters and is the first electrostatic machine capable of driving industrial loads, such as constant-pressure pump systems. The development of this motor addresses the historical limitations of electrostatic motors, which have typically been small and low-powered. C-Motive's design incorporates multiple rotors and stators, enhancing performance through precise electrostatic charge management. A significant challenge was creating a dielectric fluid with high permittivity and breakdown strength, which the team successfully developed after extensive testing. The company is now testing a more powerful 750-watt motor and plans to expand its range to 3,750 watts for various industrial applications. This advancement could open new avenues in motor technology, potentially transforming sectors reliant on electric motors.

- C-Motive's electrostatic motor offers significant efficiency improvements over traditional electromagnetic motors.

- The motor is made from sustainable materials, avoiding rare-earth elements.

- It is the first electrostatic motor capable of driving industrial applications effectively.

- The development involved overcoming challenges related to dielectric materials and high voltage requirements.

- Future models are expected to range from 750 to 3,750 watts, targeting industrial automation and HVAC applications.

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Electrostatic Motors Reach the Macro Scale

Electrostatic Motors Reach the Macro Scale

C-Motive Technologies has developed a 360-watt electrostatic motor that may enhance efficiency by up to 100%, using sustainable materials and a new organic dielectric, with plans for higher wattage models.

AI: What people are saying
The comments on the article about C-Motive Technologies' electrostatic motor reveal various perspectives and concerns regarding the technology.
  • Some commenters highlight alternative motor technologies, such as ultrasonic motors and electrostatic speakers, suggesting a broader context for motor design.
  • Concerns are raised about the sustainability claims of the motor, questioning the use of exotic dielectric fluids and the overall environmental impact.
  • There is skepticism regarding the practicality and reliability of the motor at high RPMs, particularly related to the dielectric fluid's performance.
  • Historical references to electrostatic motors, including Benjamin Franklin's experiments, spark interest in the technology's development.
  • Criticism is directed at the article's claims about efficiency, with some commenters doubting the stated improvements over existing motor technologies.
Link Icon 12 comments
By @buildsjets - 6 months
There are other types of motors that rely neither on magnetic fields nor electrostatic fields, for example the ultrasonic motor which is commonly used as a focusing actuator in high end camera lenses. They use the piezoelectric effect to cause a semiconductor material to physically deflect and "push" the rotating part around in circles... or in a line in the case of a linear USM.

https://www.piezo-motor.net/

https://www.meddeviceonline.com/doc/what-are-canon-s-linear-...

By @PaulHoule - 6 months
This book describes a family of devices that work both as electrostatic generators and motors

https://www.amazon.com/Electrostatics-Exploring-Controlling-...

By @mikewarot - 6 months
The cool thing is that this motor shouldn't take any power to maintain a static force against something. (In the same sense that a table takes 0 watts to hold something above the floor)

Only insulation resistance should be the loss at very low speeds.

By @mikewarot - 6 months
This reminded me of the Propylene Carbonate on my Amazon wish list. A few years ago, I heard about HASEL actuators[1], which started out as zip lock bags with a dielectric fluid inside, aluminum foil, and high voltage power supply. The fluid turned out to be Propylene Carbonate.

I don't know chemistry... so I figured I'd wait until I was actually ready to try things with it (having the power supplies figured out) before I got it in the house. I'm not there yet, but I understand 1700 volt transistors are a thing now.

[1] https://www.artimusrobotics.com/

By @Animats - 6 months
"C-Motive team succeeded in producing an organic liquid dielectric with low viscosity and a relative permittivity in the low 20s." Nice.
By @doe_eyes - 6 months
The sustainability angle is a bit suspect, although of course it's smart of them to make that pitch. Many large motors don't use permanent magnets, and even for the ones that do, neodymium isn't all that rare and is mined in the US. Most of our copper comes from friendly sources too (US, Chile, Peru, Mexico, Australia). When we talk about sustainability for EVs, I think the main concern is batteries, not motors.

But the most interesting (and problematic!) part of their design is the use of a dielectric liquid to increase field strength. They don't give any specifics, but reliability and weight issues aside, I'd imagine that drag-related losses would get significant at high RPM. Maybe the point is to go slow?

By @ajb - 6 months
"Benjamin Franklin built and demonstrated a macroscopic electrostatic motor in 1747,” says Krein. “He actually used the motor as a rotisserie to grill a turkey on a riverbank in Philadelphia” "

I want to know more about Ben Franklin's electrostatic turkey roaster

By @spankalee - 6 months
I wonder how well the dielectric fluid holds up if the motor is spinning at several thousand RPMs for dozens of hours?
By @nomel - 6 months
And, for a simpler linear version that's used to drive air: electrostatic speakers [1]!

[1] http://jazzman-esl-page.blogspot.com/2016/12/wire-stator-esl...

By @fnord77 - 6 months
I counted at least 30 electric motors in my (non-EV) car. 3 in each mirror. 2 in the HUD.

All of those will end up in a landfill/junk yard. Seems like a huge waste.

By @kazinator - 6 months
Who will buy a 0.5 hp motor whose parts must be bathed in an exotic dielectric fluid, and that needs a 2000V supply, and will they buy another one?
By @imbusy111 - 6 months
I couldn't get past the first two paragraphs without the article losing all credibility.

> And although there are many different kinds of electric motors, every single one of them, from the 200-kilowatt traction motor in your electric vehicle to the stepper motor in your quartz wristwatch, exploits the exact same physical phenomenon: electromagnetism.

Well, basically your whole experience of the world is just electromagnetism, nothing more. And electrostatics is part of electromagnetism theory.

> In some applications, these motors could offer an overall boost in efficiency ranging from 30 percent to close to 100 percent, according to experiment-based analysis.

What practical electric motor is even close to 30% efficient? This is laughably low.

Edit: it's BOOST over the current efficiency.