Motor Magnet Bonding Adhesive Selection | Model Comparison for Permanent‑Magnet Motors and Small Motors

Adhesives for motor magnet bonding shall be selected based on motor rotational speed, long‑term temperature resistance, magnet‑to‑rotor substrate combination, adhesive layer thickness, curing method and production cycle. For conventional one‑component heat‑curing options, evaluate Elaplus EP 1739‑1K. Choose EP 1769‑1K when high Tg and high thixotropy are required. For two‑component systems with high shear strength and toughness, select EP 2029‑2K. For high‑frequency electromagnetic fast curing requirements in small motors, EP 1772‑1K is recommended. Why Mechanical Snap‑in Grooves Alone Are Not Enough for Motor Magnets During operation, permanent‑magnet motor magnets are subjected to: Adhesive failure may cause magnet displacement, detachment and rotor unbalance. In severe cases, the motor stator and housing can be damaged. Recommended Grades for Conventional Magnet Bonding EP 1739‑1K: One‑component semi‑fluid epoxy adhesive Motor Magnet Bonding EP 1739‑1K is a one‑component heat‑curing epoxy adhesive with semi‑fluid consistency. Its datasheet lists viscosity at approx. 27 000 cps and service temperature ranging from ‑50 ℃ to 200 ℃. Suitable for: EP 1769‑1K: High‑Tg & high‑thixotropy magnet‑bonding adhesive EP 1769‑1K is a one‑component low‑flow epoxy adhesive with viscosity ≥ 300 000 cps. Recommended curing profile: 120 ℃ for 30 minutes; service temperature: ‑50 ℃ ~ 200 ℃. Suitable for: Recommended Two‑Component Magnet‑Bonding Grade EP 2029‑2K: High‑shear epoxy structural adhesive Motor Epoxy Structural Adhesive EP 2029‑2K is a 2:1 two‑component epoxy adhesive featuring good peel resistance and shear strength. According to its datasheet, shear strength on stainless steel reaches approx. 6 MPa at 150 ℃; service temperature ranges from ‑50 ℃ to 180 ℃. Suitable for: Grade for High‑Volume Small‑Motor Production EP 1772‑1K: High‑frequency electromagnetic fast‑curing adhesive EP 1772‑1K is a one‑component epoxy adhesive that achieves fast curing within around 20 seconds via high‑frequency electromagnetic heating, ideal for magnet segment bonding of small‑size motors. Recommended applications: Elaplus EP 1739‑1K, EP 1769‑1K, EP 2029‑2K and EP 1772‑1K cover semi‑fluid thermal curing, high‑thixotropy high‑Tg, two‑component high‑shear and high‑frequency fast‑curing…