Why Do Motor Magnets/Magnet Segments Require Specialized Adhesives?
In permanent magnet synchronous motors (PMSM), brushless DC motors (BLDC), servo motors and robot joint motors, magnets (magnet segments) are generally fixed onto the inner wall of rotors.
As motors evolve toward higher power density, higher rotational speed and miniaturization, magnet bonding materials must deliver sufficient bonding strength while maintaining stable performance under high centrifugal force, high-temperature cycling and long-term vibration.
Insufficient bonding performance may lead to:
■ Magnet detachment
■ Rotor unbalance
■ Increased motor noise
■ Reduced output torque
■ Failure during high-speed operation
■ Shortened motor service life
Therefore, magnet bonding adhesive has become a critical material affecting reliability in motor manufacturing.
Required Performance Specifications for Magnet & Magnet Segment Adhesives
Motor Magnet Adhesive
High Shear Strength
During high-speed rotation, magnets are subjected to tremendous continuous centrifugal force.
The adhesive must possess high shear strength to securely hold magnets over long-term operation and prevent displacement or detachment.
High Temperature Resistance
Drive motors for new energy vehicles, robot joint motors and industrial servo systems operate at elevated temperatures for extended periods.
Magnet adhesives should feature a high glass transition temperature (Tg) to avoid softening, creep or degradation of bonding performance under high temperatures.
Excellent Electrical Insulation
Beyond structural bonding, magnet adhesives provide reliable electrical insulation protection to prevent electric leakage and partial discharge, improving long-term operational stability of motors.
Thermal Shock Resistance
Motors undergo frequent start-stop cycles and temperature fluctuations.
The adhesive layer should exhibit good anti-fatigue properties and remain stable under repeated thermal expansion and contraction, resisting cracking or delamination.
ELAPLUS Bonding Solutions for Motor Magnets & Magnet Segments
ELAPLUS offers a range of single-component epoxy structural adhesives to match diverse motor manufacturing processes.
Flux Motor Magnet Sheet Bonding
EP 1739-1K Single-Component Epoxy Adhesive
Suitable for medium-temperature fast curing processes.
Product Features:
■ Single-component structural epoxy adhesive
■ Semi-fluid consistency for easy dispensing
■ Fast curing at moderate temperatures
■ Hardness: Shore D 90
■ Tg: 105°C
■ Shear strength: 22 MPa
■ Operating temperature: -50～200°C
Recommended Applications:
■ Brushless motors
■ Micro motors
■ Industrial motors
EP 1769-1K Single-Component Structural Epoxy Adhesive
Ideal for new energy vehicle drive motors, high-reliability servo motors and similar applications.
Product Features:
■ Single-component epoxy adhesive
■ High viscosity with anti-sag property
■ High mechanical strength
■ Shear strength: 26 MPa
■ Tg: 140°C
■ Operating temperature: -50～200°C
Recommended Applications:
■ New energy vehicle drive motors
■ High-speed motors
■ Industrial servo motors
EP 2029-2K Two-Component Structural Epoxy Adhesive
For magnet bonding applications requiring superior heat resistance.
Product Features:
■ Two-component structural epoxy adhesive
■ High glass transition temperature
■ Excellent thermal resistance
■ Shear strength: 21 MPa
■ Tg: 110°C
■ Operating temperature: -50～180°C
Recommended Applications:
■ High-temperature industrial motors
■ Special-purpose motors
■ Automation equipment
EP 1772-1K Single-Component Structural Epoxy Adhesive
Designed for high-speed production lines and small motor manufacturing.
Product Features:
■ Single-component structural epoxy adhesive
■ Fast curing at high temperatures
■ Formulated specifically for small motors
■ Hardness: Shore D 85
■ Tg: 120°C
■ Operating temperature: -50～200°C
Recommended Applications:
■ Small brushless motors
■ Fan motors
■ Micro motors
Guide to Motor Magnet Adhesive Selection
| Application Requirement | Recommended Product |
| General magnet bonding | EP 1739-1K |
| High-speed drive motors | EP 1769-1K |
| High-temperature operating environments | EP 2029-2K |
| High-volume fast production & small motors | EP 1772-1K |
Products can be selected according to curing process, production cycle, temperature resistance rating and motor type.
Typical Application Fields
ELAPLUS adhesives for magnets and magnet segments are widely used in:
■ New energy vehicle drive motors
■ Humanoid robot joint motors
■ Frameless torque motors
■ Industrial servo motors
■ Brushless DC motors (BLDC)
■ Permanent magnet synchronous motors (PMSM)
■ Fan motors
■ Smart home appliance motors
■ Power tool motors
■ Automation equipment motors
Why Choose ELAPLUS?
ELAPLUS specializes in electronic and industrial functional materials, delivering professional magnet bonding solutions for high-speed motors, automotive electronics and industrial automation.
Our products combine high shear strength, outstanding heat resistance, electrical insulation and long-term reliability, meeting demand for high-performance motor bonding materials in new energy vehicles, robotics and intelligent manufacturing.
