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Electric motors power everything from household appliances to industrial systems. Most rely on magnetic fields generated by electric current to create rotation. While electrostatic forces — the attraction between positive and negative charges — are well known, they have generally been too weak to drive practical machinery. As a result, magnetic actuation has remained the dominant approach for large-scale motion.
Researchers have now demonstrated that a largely overlooked electrostatic effect could change that equation. The work centers on a material known as a ferroelectric fluid, first identified in 2017 as a liquid that reacts to applied voltage far more strongly than conventional materials. Unlike typical fluids, its molecular structure responds in an ordered way under an electric field.
In standard systems, electrostatic forces act mainly along the direction of the applied voltage. A weaker, perpendicular “sideways” force also exists but has long been considered negligible. By placing a ferroelectric fluid between two closely spaced electrodes and applying voltage, researchers observed something different: the liquid moved laterally by nearly 10 centimeters, even against gravity. The same setup using ordinary liquids produced no such motion.
According to TechXplore, further analysis showed that small increases in voltage led to proportional increases in force — behavior not typically seen in conventional materials. The applied electric field caused molecules within the fluid to align, generating a measurable sideways pushing force.
Building on this principle, the team constructed a prototype motor that operates without magnets or metal rotors. Instead, the system converts the lateral electrostatic force into rotational motion. Tests confirmed that the rotor — made entirely from resin — could rotate using this mechanism.
The implications extend beyond laboratory demonstrations. Eliminating magnets and copper coils reduces dependence on rare-earth materials and may enable lighter, simpler motor designs. The absence of magnetic fields could also make such systems suitable for environments sensitive to magnetic interference, including certain medical or data storage applications. Additionally, the lower operating voltages associated with the ferroelectric fluid improve safety compared to traditional high-voltage electrostatic devices.
For defense and aerospace applications, lightweight, non-magnetic actuation systems could offer advantages in compact robotics, precision control devices and sensitive electronic environments. While further development is required, the findings introduce an alternative motor concept based on electrostatic forces that were long considered impractical.
The research was published here.
