Magnet Bonding Adhesives

Permanent magnets play a central role in the operation of synchronous machines, brushless DC motors, and traction motors used in electric vehicles. These magnets are typically mounted on the rotor either on the surface (surface-mounted permanent magnet rotors) or embedded within slots (interior permanent magnet rotors). Traditional mechanical retention methods often introduce additional mass and inertia, reduce available space for magnets, and can generate stress concentrations. Magnet bonding, by contrast, provides a lightweight, precise, and reliable fixation that ensures uniform stress distribution and improved dynamic balance at high rotational speeds.

However, these magnets are subject to significant mechanical, thermal, and chemical stresses in their daily use :

• Centrifugal forces at high rotational speeds
• Thermal cycles due to load variations
• Vibration and shock in demanding environments
• Corrosive exposure in harsh operating conditions

If magnets shift or detach, the motor’s performance and safety can be compromised. This is why magnet bonding adhesives have become a preferred solution for ensuring reliable assembly.