Sisteme electrice avansate

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https://www.linkedin.com/posts/aziz-rahman-a28a58237_the-technology-behind-the-smallest-micro-activity-7337948908649635840-jZil?utm_source=share&utm_medium=member_desktop&rcm=ACoAAATN_28BY-N73iayNQXR3LZoX_cibWRDWKM

THE TECHNOLOGY BEHIND THE SMALLEST MICRO MOTOR EVER CREATED. | AZIZ RAHMAN THE TECHNOLOGY BEHIND THE SMALLEST MICRO MOTOR EVER CREATED. The smallest micro motors are microscopic energy devices designed to rotate or move components at scales ranging from millimeters to nanometers. These motors are used in medical, scientific, and precision engineering applications, where co...

A magnetic fluid just replaced gears — and it makes machines completely silent

Engineers in Japan have built a gearless transmission system that runs entirely on magnetic fluids — and it’s nearly frictionless. Instead of metal teeth grinding together, this system uses a ferromagnetic liquid that changes shape under electric fields to transfer torque smoothly. No rattling. No oil. No grinding sounds.

This breakthrough is aimed at robotic arms and high-precision machinery where mechanical vibrations cause major errors. Traditional gearboxes create minute pulses that throw off alignment, especially in surgical or laboratory robots. But with this fluid-based design, motion remains ultra-smooth and pinpoint accurate.

The heart of the system lies in a sealed chamber filled with a ferrofluid. When magnetic coils are activated, the fluid forms temporary “teeth” that mimic gear interactions, then dissolve instantly when the current stops. There’s no mechanical contact, meaning zero wear and nearly silent operation — perfect for sterile or noise-sensitive environments.

Early prototypes showed astonishing efficiency — over 90% torque transmission with no overheating. Even more surprising, the fluid system self-adjusts to stress, meaning it won’t jam like physical gears. This could revolutionize fields like medical robotics, aerospace stabilization, and precision manufacturing.

Japan’s Ministry of Economy and engineers from Tohoku University are backing scaled-up versions for satellite thrusters and micromachine controllers. If successful, this could lead to a whole class of “soft machines” that run silently and don’t need lubrication or maintenance.

It’s not just quieter. It’s smarter, smoother, and almost immune to mechanical fatigue.

Departamentul de Electrotehnică al Facultății de Inginerie Electrică, Energetică și Informatică Aplicată, organizează în data de 22 mai 2025, orele 13:00, sala E-102, o sesiune de comunicări științifice studențești în domeniul electrotehnică teoretică și aplicații în sisteme electrice, la care sunt invitați să participe studenții cu interes deosebit pentru electrotehnică teoretică, circuite electrice, aparate electrice și aplicațiile acestora în sistemele electrice.

Proba va consta într-o prezentare Power Point a unui proiect original și demonstrația practică a acestuia.

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