Breaking Frameless Motor Performance Barriers: Vacuum Potting Is Critical
February 11, 2026
In high-end fields such as industrial robots, semiconductor equipment, and aerospace, frameless torque motors and linear actuators are being widely adopted thanks to their advantages of high power density and high dynamic response.
However, their open, frameless structure leaves the motor windings directly exposed to the environment, posing severe challenges in heat dissipation, protection, and reliability.
Vacuum potting technology is the key to addressing these challenges. The ability to achieve bubble-free and glue-leak-free performance directly determines the motor’s performance and service life.
PART 1
Core Process 
of Vacuum Potting Technology
Compared with conventional potting, vacuum potting completes defoaming and potting in a vacuum environment, thoroughly eliminating tiny air bubbles deep inside the windings.
By performing defoaming and infusion under vacuum, vacuum potting achieves the critical goals of bubble-free and glue-leak-free quality.
Its core process begins with precise fixture preparation and preheating to improve glue fluidity.
This is followed by high-vacuum defoaming and accurate glue injection to ensure full filling and prevent bubble formation.
Finally, a step-temperature curing process reduces internal stress, and multiple strict inspections are carried out to guarantee reliable product quality.
PART 2
Practical Solutions for Bubble-Free & Glue-Leak-Free Processing
Bubble Control
A closed-loop system featuring dynamic defoaming, low-speed stirring, and vacuum infusion ensures the adhesive maintains optimal conditions before potting.
Technical Advantages
With expertise in precision potting fixture design, Ruizhihang enables precise glue boundary control and improved production efficiency.
Frameless Torque Motor
Actual state after potting
PART 3
Achieving Vacuum Potting Technology
The realization of bubble-free and glue-leak-free performance requires not only scientific process concepts but also high-precision equipment.
Precise control of vacuum level, temperature, and injection speed/pressure by the vacuum potting machine is essential.
Suzhou Ruizhihang Intelligent Technology has deep roots in the motor industry. Its vacuum potting equipment targets core pain points:
Pain Point Solutions
- High-precision metering and mixing ensure consistent glue ratio, avoiding poor curing.
- Full-process vacuum control seals defoaming, potting, and curing to eliminate deep bubbles.
- Intelligent temperature control and pressure compensation enable accurate preheating and stable back pressure, preventing secondary bubbles.
- Modular fixtures with fixture design services allow fast adaptation to different stators, boosting efficiency and yield.
The integration of process and equipment is the key guarantee for transitioning frameless motor performance from design to mass production.
PART 4
Conclusion
The quality of vacuum potting technology directly affects the performance of frameless torque motors.
Bubble-free and glue-leak-free is not only a process requirement but also an important standard for measuring manufacturing capability.
As motor technology evolves toward higher power density, higher demands are placed on the precision and reliability of potting processes.
Choosing a mature process solution is critical to ensuring high-end equipment achieves its designed performance.
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