Shape-Shifting Cube Robots for Space

Modular robots are particularly promising for space exploration because of their ability to self-assemble and reconfigure into different shapes. Yet, many existing models remain bulky and rely on costly motors for movement. To overcome this, researchers at the Massachusetts Institute of Technology (MIT) have designed more scalable, lightweight cube-shaped robots.

MIT’s Computer Science & Artificial Intelligence Laboratory (CSAIL) teamed up with the University of Calgary to produce these shape-shifting cubes using 3D printing. Unlike conventional designs, these robots contain no motors or mechanical parts; instead, they rely on electromagnets to rearrange themselves.

Understanding Electromagnetism

Electromagnetism, according to McGraw Hill’s Access Science, describes the interactions between electrically charged objects, magnetic moments, and electromagnetic fields. These fields can be static, slowly varying, or dynamic waves (like light), following the principles of optics. Electromagnetic interactions are integral to phenomena in atoms, electricity, magnetism, and light, forming one of the universe’s four fundamental forces. Electromagnetism underpins diverse scientific fields, including physics, optics, chemistry, and molecular biology.

By using electromagnetism, MIT scientists eliminated the need for heavy and expensive actuators in each cube. Their design embeds small, low-cost electromagnets along the cube edges. These magnets can attract or repel, allowing the robots to move relative to one another and rapidly alter their shape.

ElectroVoxels: The Shape-Shifting Cubes

The team has named this autonomous modular system ElectroVoxels. Currently in a prototype phase, these cubes can already perform basic maneuvers, such as shifting side-by-side to form new configurations. Each cube measures 60 mm on each side and contains ferrite-core electromagnets—small black tubes wound with copper wire. Tiny internal circuit boards control the flow of electricity through the electromagnets, allowing precise movements. The cubes are fully wireless, simplifying maintenance and enabling scalable production.

How ElectroVoxels Move

Shape-shifting with ElectroVoxels involves two main types of movement: pivoting along the edge of another cube and traversing between cubes. By controlling individual electromagnets, users can regulate movement speed and prevent collisions. Advanced software allows coordination of up to 1,000 ElectroVoxels, assigning specific magnetic operations to achieve complex shapes.

The system is also designed for low-gravity environments, making it suitable for space applications. Researchers envision using ElectroVoxels to adjust spacecraft inertia, addressing challenges related to launch mass and volume.

Future Applications

MIT researchers aim to expand ElectroVoxels’ capabilities for a variety of space missions. One potential application is self-sorting storage containers, which could revolutionize logistics in orbit or on long-duration missions.

This innovation represents a significant step toward versatile, lightweight, and scalable robotic systems capable of operating in space without the limitations of traditional motor-based designs.