Industry Deep-Dive: Inner Rotor vs. Outer Rotor Frameless Torque Motors for Robotic Joint Actuation and Precision Positioning
Global Leading Market Research Publisher QYResearch announces the release of its latest report “Frameless Permanent Magnet Torque Motor – Global Market Share and Ranking, Overall Sales and Demand Forecast 2026-2032″. Based on current situation and impact historical analysis (2021-2025) and forecast calculations (2026-2032), this report provides a comprehensive analysis of the global Frameless Permanent Magnet Torque Motor market, including market size, share, demand, industry development status, and forecasts for the next few years.
Core User Pain Point & Solution Direction: Robotics engineers and precision equipment designers face a critical motion control challenge: traditional servo motors with gearboxes suffer from backlash, limited dynamic response, and high moment of inertia, while direct-drive motors often lack torque density for compact applications. Frameless permanent magnet torque motors solve this through innovative direct-drive technology. This motor utilizes a toroidal coil and radially distributed permanent magnet structure. Eliminating the traditional frame structure (base and bearing supports), it integrates directly into the user’s mechanical system, offering high torque density, zero transmission backlash, extremely low moment of inertia, and high dynamic response. Its toroidal structure ensures a large hollow channel while also achieving greater torque uniformity and low cogging. With characteristics such as small volume, large torque, and high power density, this motor fits highly with joint actuators and is regarded as the core power source for flexible movement and precise control of robots. Frameless motors are ideally suited for satellite attitude control, aerospace servos, semiconductor wafer handling, medical imaging equipment, and advanced robotic joints (humanoid and collaborative robots).
Global Market Size & Growth Trajectory
The global market for Frameless Permanent Magnet Torque Motor was estimated to be worth US946millionin2025andisprojectedtoreachUS946millionin2025andisprojectedtoreachUS 4,511 million, growing at a CAGR of 25.0% from 2026 to 2032. In 2025, global annual sales reached approximately 2.7 million units. The future development will deeply benefit from the commercial landing of the humanoid robot industry. As downstream industries gradually move towards large-scale commercialization, market demand shows a significant growth trend, driving continuous expansion of the industry market space.
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Market Share & Competitive Landscape
The market features a consolidated landscape with established motion control specialists:
- Kollmorgen (US) – Global leader, approximately 15% market share. Strong in robotics and defense applications.
- Moog (US) – Approximately 10% share. Strong in aerospace and medical equipment.
- Parker Hannifin (US) – Approximately 9% share. Broad industrial automation portfolio.
- Nidec (Japan) – Approximately 8% share. High-volume motor manufacturer entering frameless segment.
- Maxon Motor (Switzerland), Tecnotion (Netherlands), Allied Motion, Akribis, TQ Robodrive, Kinco Automation (China), Haozhi Industrial (China) – Regional and specialist players.
The top three (Kollmorgen, Moog, Parker) account for approximately 34% of global market share.
Type Segmentation
- Inner Rotor Type (58% share) – Rotor inside stator. Higher rotational inertia, suitable for larger robot joints and industrial automation.
- Outer Rotor Type (42% share) – Stator inside rotor. Higher torque density for given diameter, ideal for compact robotic joints (humanoid fingers, wrists, elbows).
Application Segmentation
- Humanoid Robots (35% share) – Fastest-growing segment (40%+ CAGR). Joint actuators for full-body humanoids (Tesla Optimus, Figure 01, Unitree, Xiaomi CyberOne, Boston Dynamics Atlas). Each humanoid requires 28-40 frameless motors.
- Collaborative Robots (30% share) – 28% CAGR. Cobot joints (Universal Robots, Doosan, Franka Emika, AUBO) typically use 6-7 frameless motors per arm.
- Medical Equipment (20% share) – 18% CAGR. Surgical robots (da Vinci), medical imaging (CT/MRI patient positioning), prosthetics.
- Others (15% share) – Aerospace, semiconductor equipment, defense, industrial automation.
Technical Deep-Dive: Key Advantages & Barriers
| Parameter | Frameless Torque Motor | Traditional Servo + Gearbox |
|---|---|---|
| Backlash | Zero | 1-10 arcmin |
| Torque density | High (5-10 Nm/kg) | Medium (3-5 Nm/kg with gearbox) |
| Moment of inertia | Very low | High (gearbox + motor inertia) |
| Peak torque (transient) | 3-5x rated | 2-3x rated |
| Efficiency | 85-92% | 70-85% (gearbox losses) |
| Cost per Nm | Higher (2-5x) | Lower |
Technical Barriers: Since high power needs to be output in a low-voltage power supply environment (48-60V for robots), magnetic circuit design and process design become key to enterprise competition. Direct drive design utilizing the machine’s own bearings to support the rotor not only optimizes structural compactness but also improves overall efficiency by reducing wind friction losses and decreasing mechanical maintenance, bringing long-term stable profit growth to enterprises.
Recent Technical Barrier & Breakthrough (Q1 2025) – A persistent challenge for frameless motors in humanoid robots has been maintaining high torque at low speeds while managing thermal dissipation in compact joints. Kollmorgen introduced “TBM2G Series” with advanced magnet shaping (Halbach array) and optimized lamination stack, achieving 20% higher torque density (8 Nm/kg vs. 6.5 Nm/kg) with 15°C lower operating temperature, enabling sustained operation in 50°C ambient environments.
Typical User Case (Q4 2025) – A US-based humanoid robotics startup (Tesla Optimus) selected Kollmorgen frameless torque motors for shoulder, elbow, wrist, hip, and knee joints (34 motors per robot). Results: peak torque density of 8.5 Nm/kg, zero backlash enabling precise manipulation, low inertia for dynamic walking (2-3 m/s), and continuous torque at 30-50 rpm. The robot achieved 8-hour operation with thermal management.
Exclusive Observation: Humanoid Robot Commercialization – The Key Growth Driver
The frameless permanent magnet torque motor market’s explosive 25.0% CAGR is driven almost entirely by humanoid and collaborative robotics. Key projections:
| Parameter | 2025 | 2030 (est.) | Growth |
|---|---|---|---|
| Humanoid robot shipments | 5,000 units | 1.5 million units | 300x |
| Frameless motors per humanoid | 30-40 | 30-40 | – |
| Motor value per robot | US$ 3,000-6,000 | US$ 1,500-3,000 (scale) | – |
| Total humanoid motor market | US$ 20-30 million | US$ 2-4 billion | 100x |
Major humanoid programs: Tesla Optimus (production 2026-2027), Figure AI (BMW factory trial 2025), Unitree H1 (China), Xiaomi CyberOne, Fourier Intelligence GR-1, Boston Dynamics Atlas (research). Each program requires thousands of frameless motors per year at scale.
Industry Segmentation: Precision Motor Manufacturing
Frameless torque motor manufacturing is precision electromechanical assembly with high barriers: (1) rare-earth magnet assembly (NdFeB, precise orientation), (2) stator winding (copper fill factor optimization), (3) thermal management (potting, heat path design), (4) low-cogging rotor design (skewed magnets or optimized pole shapes). Capital intensity: winding machines US200,000−500,000,magnetassemblysystemsUS200,000−500,000,magnetassemblysystemsUS 150,000-300,000, precision test equipment US$ 100,000-250,000.
Cost structure (typical mid-size frameless motor, US$ 200-500):
| Component | Percentage |
|---|---|
| Rare-earth magnets (NdFeB) | 25-35% |
| Copper windings and stator lamination | 20-30% |
| Precision bearings (if included, often customer-supplied) | 10-15% |
| Hall sensors/encoder (optional integrated) | 10-15% |
| Assembly and testing | 15-20% |
| Gross margin (premium) | 35-50% |
Additional Market Dynamics: The market faces challenges from (1) high rare-earth magnet cost volatility (NdFeB price fluctuations 20-40% annually), (2) manufacturing complexity at scale (humanoid volume requires 100x current production), (3) competition from integrated actuator modules (motor + encoder + driver + gearbox). However, the combination of humanoid robot commercialization, collaborative robot adoption, and medical robotics growth positions the frameless permanent magnet torque motor market for sustained 20-25% annual growth through 2032.
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