1. Product Overview
The KMF series frameless torque motor is a core component of advanced servo systems, designed for high-precision and high-response motion control applications. As a direct-drive solution, it eliminates the need for gearboxes or couplings, directly transmitting torque to the load. This design significantly enhances positioning accuracy, dynamic response, and system reliability.
With its compact structure, high torque density, and outstanding performance, the KMF motor is widely adopted in robotics, CNC machinery, semiconductor equipment, aerospace, and medical imaging systems.
2. Key Features
- High Torque Density
Optimized electromagnetic design and rare-earth permanent magnets deliver superior torque output within a compact volume. - Low Inertia
Reduced rotor inertia improves acceleration and deceleration performance, enabling fast dynamic response. - Zero Cogging Effect
Advanced winding design eliminates cogging torque, ensuring ultra-smooth rotation and high-resolution positioning. - Direct-Drive Design
No gearbox or transmission required, eliminating backlash, friction, and wear while improving system rigidity and lifespan. - Compact Frameless Design
Without housing or bearings, the motor can be seamlessly integrated into mechanical structures, providing maximum design flexibility.
3. Technical Specifications
| Parameter | Range |
|---|---|
| Motor type | Frameless torque motor |
| Rated torque | 5 Nm – 600 Nm |
| Peak torque | 15 Nm – 1800 Nm |
| Rated speed | 50 – 3000 rpm |
| Torque constant | 0.3 – 2.5 Nm/A |
| Voltage constant | 10 – 100 V/krpm |
| Cooling method | Natural cooling / Water cooling |
| Mounting | Embedded integration |
| Applications | Industrial automation, robotics, medical devices, precision testing |
4. Working Principle
The KMF motor is based on Permanent Magnet Synchronous Motor (PMSM) technology. The stator windings generate a rotating magnetic field that interacts with the rotor’s permanent magnets, producing electromagnetic torque.
Thanks to its direct-drive structure, torque is directly transmitted to the load without mechanical intermediaries. This eliminates backlash, reduces energy losses, and provides superior stiffness and control precision.
5. Comparison with Conventional Motors
| Aspect | KMF Frameless Torque Motor | Traditional Servo Motor + Gearbox |
|---|---|---|
| Precision | Extremely high, zero cogging | Moderate, affected by backlash |
| Response speed | Very fast | Limited by transmission |
| Service life | Long, minimal wear | Shorter, mechanical wear |
| Maintenance | Low maintenance | Requires periodic servicing |
| Design flexibility | High, compact integration | Limited by gearbox size |
6. Application Areas
- Robotics – High-precision joint motion control
- CNC machines – Enhanced rotary table positioning accuracy
- Medical imaging – Smooth, quiet rotation for better image quality
- Semiconductor equipment – High-speed, high-precision wafer handling
- Aerospace – Precision control systems and attitude adjustment
7. Selection Guide
When selecting a KMF motor, consider:
- Torque requirements (rated and peak torque)
- Speed range
- Mounting space and method
- Cooling type (natural or water cooling)
- Load characteristics (inertia, precision requirements)
8. Installation & Integration
- Ensure concentric alignment between rotor and load structure
- Use a high-resolution encoder for feedback accuracy
- Pair with a compatible servo drive for closed-loop control
- Consider heat dissipation design for long-term reliability
9. Maintenance
- Inspect winding insulation and cable connections regularly
- Keep motor and cooling channels clean
- Use proper drivers with protection against overcurrent and overheating
- Avoid continuous overload operation
10. FAQ
- What are the advantages of the KMF frameless torque motor?
– Direct drive, zero cogging, high torque density, and superior accuracy. - Does it require a servo drive?
– Yes, it must be paired with a dedicated servo drive. - Which industries can benefit from it?
– Robotics, industrial automation, medical imaging, semiconductor, aerospace. - Is customization available?
– Yes, customized models can be provided upon request.
