Slotless Electric Motor Technologies for Aerospace and Defense Applications

Alva Industries is presenting its expanded portfolio of slotless electric motors and drive systems at the Eurosatory 2026 defense exhibition in Paris, France, on June 16. The showcased hardware addresses the high-torque and low-weight requirements of marine propulsion, aerospace, and optronics applications.

Real-World Mechatronic Integration
The exhibition highlights the integration of slotless motor architecture into operational mechatronic systems. Alva Industries is demonstrating its technology through active client applications, including a compact sensor payload developed by Vertigo. Additionally, the company is exhibiting marine thruster configurations engineered in collaboration with Ocein and an undisclosed marine torpedo manufacturer. These applications utilize frameless motor designs to reduce weight and improve electromagnetic efficiency in confined mechanical spaces.

Slotted vs. Slotless Architecture Comparison
The core technical differentiation of the exhibited hardware is the slotless stator design. At the event, engineering teams are providing comparative demonstrations between traditional slotted motors and slotless architectures. Conventional slotted motors experience "cogging"—magnetic resistance between the rotor magnets and the iron teeth of the stator that causes uneven torque delivery. The slotless configuration eliminates this effect, ensuring smooth torque delivery and high system responsiveness. The design maintains continuous torque output levels that are competitive with traditional slotted architectures, even when implemented in out-runner configurations.

Exhibition Product Launches
During the exhibition on June 16, the company is officially unveiling new hardware developments at booth F286 in Hall 4. This launch, alongside recent releases such as the S-190-35 motor and the TorqStudio platform, is engineered to meet the operational parameters required by modern aerospace, defense, robotics, and industrial mobility systems. The modular ecosystem allows engineers to integrate customized motor profiles directly into existing vehicle control networks.

Additional Context: This section details technical specifications and competitive benchmarking not included in the original product announcement
In the precision motion control sector, slotless motors traditionally sacrifice overall power and torque density compared to slotted iron-core motors due to a lower copper fill factor. However, Alva Industries utilizes an industrial winding method that achieves up to a 60% copper fill factor with non-skewed stator windings. This metric allows their slotless motors to benchmark directly against high-performance slotted variants in continuous torque density while eliminating the iron losses and cogging torque associated with stator teeth. Furthermore, combining this stator architecture with a Halbach array rotor maximizes magnetic flux, giving the frameless motors an extremely thin cross-section that accommodates larger inner rotor diameters for routing cables or integrating internal gearboxes.

Edited by Lekshman Ramdas, Induportals editor – adapted by AI.

www.alvaindustries.com