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68
Engineered for spatial efficiency and uncompromising torque delivery, the LHTM68 Series 68MM Frameless Torque Motor offers a highly compact footprint for integrated mechanical systems. The moment you handle this motor, the dense concentration of the high slot fill factor precision windings and the solid heft of the rare-earth permanent magnets convey its industrial-grade construction. The exposed stator and rotor design allows engineers to embed the drive mechanism directly into the host machine's structural housing, eliminating redundant bearings and coupling components.
To ensure precise structural integration, we provide comprehensive stator and rotor tolerance matching guidelines. Whether your assembly protocols require industrial adhesives or thermal shrink-fitting, the motor integrates smoothly into tight mechanical envelopes. Our frameless motors are ideal for your application. They feature:
Direct-drive brushless motor architecture for zero-backlash motion and immediate response.
Low cogging torque design, ensuring exceptionally smooth rotation even at micro-speeds.
Low-speed and high-speed windings tailored to diverse operational profiles and load requirements.
Minimizes motor size and weight while maximizing continuous torque output through optimized electromagnetic circuits.
Advanced thermal management utilizing premium insulation materials to maintain cool operation under continuous heavy loads.
Open architecture compatibility with absolute encoders, incremental encoders, and Hall sensors for versatile servo drive matching.
The LHTM6818 model operates on a standard 48Vdc bus, delivering a rated power of 207W and a continuous rated torque of 0.66 N·m at 3000 RPM. By utilizing a 10-pole pair configuration and optimizing the electromagnetic design, the motor achieves a peak torque of 1.98 N·m, providing the necessary overhead for sudden acceleration phases in dynamic motion profiles. The 68mm stator outer diameter and a large 40mm rotor inner bore leave ample central space for routing cables, optical fibers, or pneumatic lines through the central axis of your equipment. With a low rotor moment of inertia (0.25 kg·cm²), the system responds to control inputs with microsecond agility. Every parameter below reflects rigorous validation, ensuring the motor performs predictably within your specified thermal and electrical limits.
Model | 6818 |
Performance Item | Parameter Value |
|---|---|
Stator Outer Diameter [mm] | 68 |
Stator Overall Length [mm] | 18.6 |
Stator Stack Length [mm] | 10 |
Rotor Inner Diameter [mm] | 40 |
Rotor Overall Length [mm] | 11 |
Voltage [Vdc] | 48 |
Rated Power [W] | 207 |
Rated Torque [N·m] | 0.66 |
Rated Current [Arms] | 5.5 |
Rated Speed [RPM] | 3000 |
Peak Current [Arms] | 16.6 |
Peak Torque [N·m] | 1.98 |
Peak Speed [rpm] | 6000 |
Torque Constant [N·m/Arms] | 0.1 |
Rotor Moment of Inertia [kg·cm²] | 0.25 |
Back EMF Constant [V/Krpm] | 7 |
Line Resistance @ 20°C [Ω] | 0.45 |
Line Inductance @ 1 kHz [mH] | 0.5 |
Number of Pole Pairs [p] | 10 |
1. Robotics: Designed specifically for the compact joints of humanoid robots, quadruped robots, collaborative robots, and automated manipulators. The 40mm hollow bore allows for internal routing of communication cables and power lines, while the high torque density supports the dynamic balancing required for complex walking and lifting tasks.
2. Machine Tool: Provides direct-drive spindle and rotary table operation for precision machine tools. The absence of mechanical transmission elements eliminates backlash and wear, resulting in superior surface finishes on machined parts and silent, vibration-free rotation even under heavy radial loads.
3. Packaging: Integrates seamlessly into high-speed automated packaging lines where rapid indexing and precise positioning are critical. The motor's thermal stability ensures continuous operation across multiple shifts without torque degradation.
Additionally, these motors serve exceptionally well in optical precision turntables and aerospace actuation units, where weight constraints and reliability are paramount.
Answer: Our full frameless torque motor portfolio supports standardized ODM and OEM engineered customization. Adjustable parameters include operating voltage, continuous & peak torque, bore size, stack length, and winding schemes. We offer engineered sample validation and serial production to meet clients’ bespoke mechanical and motion system specifications. Our engineering team collaborates directly with your design unit to adjust the electromagnetic coils and structural dimensions, ensuring the final motor aligns perfectly with your specific load requirements and spatial constraints.
Answer: These high-precision frameless direct-drive motors are engineered for demanding industrial and precision fields, covering humanoid robot joints, medical automation, optical precision turntables, aerospace actuation units, and semiconductor precision handling automated equipment. The direct-drive nature provides the immediate responsiveness required for delicate semiconductor wafer handling and the rigid holding torque necessary for multi-axis surgical robots.
Answer: Because frameless motors lack their own bearings, final concentricity relies on the host machine's bearing system. We supply detailed installation manuals detailing the exact machining tolerances required for your housing and shaft. Proper adherence to these dimensional guidelines guarantees the air gap remains uniform, preventing magnetic imbalance and ensuring the specified torque constants are consistently met.
Every stator and rotor set undergoes an exhaustive series of validation protocols before leaving the production floor. Our testing regimen includes precise dynamic balancing, strict cogging torque measurement, insulation resistance verification, and high-low temperature aging cycles. This ensures that every unit delivers industrial-grade batch consistency and an extended operational lifespan, even in demanding environments.
Furthermore, the LHTM68 series complies fully with CE, RoHS, and other international industrial standards, facilitating smooth market entry for your final automated equipment. Supported by a highly flexible manufacturing supply chain, we provide rapid prototyping for engineering samples and scale up efficiently to mass production. This agile delivery capability significantly compresses your product development timeline, getting your innovations to the market faster.
