Executive Summary

This white paper explores Carbon Nanotube (CNT) Motors and motors without coils, two emerging technologies that promise to transform electric motor design. By leveraging advanced materials and innovative structures, these motors offer higher efficiency, compact size, and novel actuation mechanisms.

The paper examines their operating principles, material properties, and manufacturing techniques, highlighting the technical advantages over conventional motors. Challenges in scalability, durability, and integration are also discussed to provide a balanced industry perspective.

A market analysis evaluates growth potential across electronics, automotive, and robotics sectors, positioning these technologies as strategic innovations that can deliver both performance improvements and economic benefits.

The paper also outlines future research directions and commercialization opportunities, emphasizing the role of industry partnerships and investment in accelerating adoption. This provides readers with a practical roadmap for leveraging these technologies in real-world applications.

1. Introduction

Electric motors are ubiquitous in modern industry, powering applications from consumer electronics to automotive systems and robotics. Traditional motors rely heavily on coils and magnetic fields, which can limit efficiency, miniaturization, and novel design possibilities.

Emerging technologies like Carbon Nanotube (CNT) Motors and motors without coils aim to overcome these limitations. CNT motors leverage the exceptional electrical, thermal, and mechanical properties of carbon nanotubes to achieve high torque and efficiency at nanoscale dimensions. Motors without coils, on the other hand, explore alternative actuation mechanisms, eliminating the need for traditional windings while reducing size, weight, and energy loss.

This white paper provides a comprehensive examination of these technologies, including operating principles, material advantages, manufacturing techniques, industrial applications, and market potential. By understanding both the technical and commercial aspects, readers will gain insights into how these innovations can reshape electric motor design and industry standards.

2. Problem Statement

While traditional coil-based motors are widely used and well-understood, they come with several inherent limitations that impact performance, efficiency, and design flexibility:

Despite their widespread use, conventional coil-based motor designs present several limitations, including increased size and weight, resistive energy losses, thermal management challenges, manufacturing complexity, limited design flexibility, and reliability concerns due to coil degradation. These constraints highlight the need for exploring alternative motor architectures that can achieve improved efficiency, compactness, performance, and long-term reliability.

These limitations highlight the need for next-generation motor technologies, such as Carbon Nanotube motors and motors without coils, which aim to overcome these constraints while offering enhanced efficiency, reduced size, and novel performance characteristics.

3. Motors without Coils: Industrial Technology Landscape

Motors without coils, also referred to as coil-free or solid-state motors, represent a new paradigm in electric motor design. By eliminating traditional windings, these motors leverage alternative actuation mechanisms—such as electrostatic, piezoelectric, or magnetic domain interactions—to generate motion.

The coil-free motor landscape is rapidly evolving, with research and industrial innovation driving adoption across high-value sectors. These motors are increasingly viewed as strategic alternatives to conventional coil-based designs.

4. IP Activity in Solar powered Vehicles

As part of our analysis of patent activity in Coil-less and CNT Motor, an IP landscape study was conducted to identify patents related to the construction system, electrical drive system, Material feasibility and motor efficiency. A total of 1034 patent families were analyzed and 196 patent applications were selected for final analysis.

4.1 Relevant keywords, synonyms and classes used for search

• Coil-less motor, Coreless motor, CNT motor, Carbon Nanotube Motor, Core-free motor, iron core free motor
• DC motor, Brushless motors, Brushed Motors
• Electrical drive system, Power Supply system, Motor supply system
• Relevant patent classification includes Y02T10/64, B60L15/20, H02K3/28, D06M101/40, H02K29/00, D01F9/12, D06M2101/40, Y02T10/72

Figure 4 shows the distribution of patents across priority countries, providing insight into major R&D locations for CNT and coil-less motors, China has most patents i.e., 106, followed by JP with 56 patents.

Figure 5 shows the application area of CNT and coil-less motors with a major focus on Electrical Engineering, with 120 patents in this domain. Mechanical Setup also being most crucial part, also received considerable attention, with 69 patents.

Figure 6. shows a pie chart demonstrating the total number of active and inactive patents, with 99 patents categorized as “Active" with 71 patents categorized as “Granted” and 28 as “Applied” and 131 as “Dead".

Figure 7. Shows top patent assignees, with the Toyota Group leading with 9 patents, followed by the Siemens AG with 5 patents.

5. Carbon Nanotube Motors: Enabling Technology Overview

Carbon Nanotubes (CNTs) are cylindrical nanostructures of carbon with exceptional electrical, thermal, and mechanical properties, making them ideal for next-generation motor applications. CNT motors leverage these properties to replace conventional coils and magnetic cores, achieving high torque, efficiency, and miniaturization.

6. Market Analysis and Commercial Potential

The global coreless DC motors market was valued at $2.32 billion in 2025 and is projected to reach $4.55 billion by 2034, growing at a compound annual growth rate (CAGR) of 7.8% during the forecast period.

The market for Carbon Nanotube (CNT) motors and coil-less motors is emerging rapidly, driven by the demand for high-efficiency, lightweight, and miniaturized motor solutions. CNT motors, leveraging the exceptional electrical, thermal, and mechanical properties of carbon nanotubes, are largely in the prototype and early demonstration stage. Research institutions such as the Korea Institute of Science and Technology (KIST) have successfully developed functional CNT-based motors, demonstrating significant reductions in weight and enhanced actuation precision, but large-scale industrial deployment is still limited.

The coil-less motor sector is advancing toward commercial deployment, driven by companies such as Advanced Electric Machines (AEM), Turntide Technologies, Hinetics, and CoolShaft. AEM is developing coil-free, rare-earth-free motors through investments and automotive OEM partnerships, while Turntide is expanding its high-efficiency portfolio through acquisitions. The supporting ecosystem is also growing, with suppliers such as NanoIntegris providing advanced carbon nanotube (CNT) materials. Hinetics and CoolShaft are developing slotless and magnetless motor technologies for aerospace, robotics, and industrial applications. Overall, partnerships, acquisitions, material innovations, and OEM collaborations are accelerating technology maturity and creating strong growth opportunities for next-generation motor technologies across high-value industrial markets.

6.1 Key Players in CNT & Coil-Less Motor Technologies

Research institutions like KIST and MTC are advancing CNT integration and non-metal motor concepts, mainly at prototype and pilot stages. Startups such as AEM and Chara Technologies are moving toward commercialization through OEM partnerships, focusing on rare-earth-free and coil-less motors. Established companies like Turntide and Hinetics are developing scalable motor architectures that reduce dependence on traditional coils and magnets. Meanwhile, material suppliers such as Raymor/NanoIntegris support the ecosystem with high-quality CNT materials, enabling next-generation motor manufacturing and accelerating the transition from research to commercial applications.

7. Conclusion

Carbon Nanotube (CNT) and coil-less motors are emerging as transformative technologies that offer superior efficiency, lightweight design, and enhanced performance over conventional electric motors. Continued advancements in material innovation, scalable manufacturing, and strategic collaborations are essential to accelerate commercialization. Focusing on high-value applications such as robotics, aerospace, automotive, and medical devices, while aligning with sustainability and energy-efficiency goals, will enable wider market adoption and strengthen the competitive position of next-generation motor technologies.