Delo introduces adhesive for e motors

1 min read

Delo has developed a dual-curing, high-temperature adhesive for electric motor applications that is designed for multiple processes, including magnet bonding and magnet stacking in manufacturing.

Light fixation of magnets in electric motors using a high-temperature adhesive
Light fixation of magnets in electric motors using a high-temperature adhesive - (Image credit: Delo)

The Delo Dualbond HT2990 is claimed to be the first high-temperature-resistant structural adhesive capable of light fixation. This supplemental means of curing is expected to help electric motor manufacturers quicken assembly processes and optimise efficiency in their production, achieving light fixation in five to 10 seconds.

In magnet bonding, while heat is the standard method of curing, complementing it with light fixation is said to create an already-cured outer layer that helps keep everything in place. The adhesive does not seep outside or onto the motor laminations. In magnet stacking, supplementing heat curing with light fixation lets users forego having to keep magnets under a jig in the oven to reach the desired bondline thickness.

Final curing with heat takes 30 minutes at 150 °C or 60 minutes at 130 °C. It is possible to skip the heat curing step if exposure to heat occurs later in electric motor assembly, for example, via heat shrinkage. Induction curing can be another alternative to oven curing.

According to Delo, the adhesive can achieve a compression shear strength of up to 70 MPa on steel at room temperature. This compares to 45 MPa achieved by standard high-performance heat-curing epoxies. It also has a high glass transition temperature of 165 °C. In heat as extreme as 180 °C, it still exhibits a tensile shear strength of 7 MPa on aluminium. This is equivalent to 70 kg/cm² of force.