NTN Starts Mass-production of “Low Dust Generation Bearing for Servo Motors” July 28, 2025
- Starting mass-production of a high value-added product for major motor manufacturers, which significantly minimizes dust generation from grease, while improving low torque performance.
- Contributing to improved reliability in servo motor control by suppressing the adhesion of grease components to motor encoders and brake discs
NTN Corporation (hereafter NTN) has started the mass-production of the “Low Dust Generation Bearing for Servo Motors*1,” a bearing significantly reducing dust generation*2 and rotational torque for servo motors which are widely used in industrial robots, machine tools, and semiconductor manufacturing equipment.
- Press release on November 13, 2020:
Development of “Low Dust Generation Bearing for Servo Motors”
https://www.ntnglobal.com/en/news/new_products/news202000072.html - Evaporation or dispersion of lubricant oil components from inside the bearing, potentially resulting in external leakage
“Low Dust Generation Bearingfor Servo Motors”
Example of applied areas in servo motorsfor industrial robots
Servo motors are equipped with rotation detectors (sensors/encoders) and brakes, enabling highly precise control of rotational speed and angle. As a result, they are used in industrial machinery that requires precise movements, such as industrial robots and machine tools. However, when dust particles such as oil components from the grease used in bearings adhere to the encoder, it can reduce detection accuracy. Similarly, if they adhere to the brake disc, it may affect braking performance. Therefore, bearings for servo motors are required to suppress such particle generation.
The “Low Dust Generation Bearing for Servo Motors” developed by NTN reduces dust generation by approximately 90% compared to the conventional product by adopting a new low dust grease developed through a review of its components and composition and a newly designed seal with enhanced sealing performance. Furthermore, the seal maintains sealing performance while achieving approximately 50% lower torque compared to the conventional product by improving its shape.
The structure of “Low Dust Generation Bearing for Servo Motors”
In addition to enhancing the reliability of servo motor control through significant reduction of dust generation, the product has also been highly evaluated for its durability: allowing stable long-term use while maintaining low rotational torque. As a result, it has been adopted by a major motor manufacturer and has welcomed mass-production.
Servo motors offer highly precise rotational control, and in recent years, their demand has been increasing particularly in industrial robots and machine tools. Servo motors used in industrial and humanoid robots are often applied to drive joints, where downsize and increased power output are required to increase shaft velocity and acceleration/deceleration velocity at joints. Since this product significantly suppresses dust generation from the bearing, it eliminates the need for sealing devices in servo motors, enabling a more compact design. Additionally, by maintaining low rotational torque, it also contributes to higher power output of servo motors.
NTN will continue to propose high value-added products such as the “Deep Groove Ball Bearing for High Speed Servo Motors*3,” which is designed to support high speed rotation and reduce vibration in servo motors for machine tools. Through these efforts, we aim to further contribute to the performance enhancement of servo motors.
- Press release on October 28, 2024:
NTN Develops “Deep Groove Ball Bearing for High Speed Servo Motors” for Machine Tools
https://www.ntnglobal.com/en/news/new_products/news202400091.html
Features (compared to the conventional product)
| 1. Low dust | Reduce dust generation by approximately 90% |
|---|---|
| 2. Low torque | Reduce rotational torque by approximately 50% |
Application
Servo motors for industrial robots, machine tools, semiconductor manufacturing equipment, etc.
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