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Electric vehicle production has increased at an exponential rate. The Wall Street Journal reports that that, in 2023, EVs made up a whopping 10 percent of global new car sales—a new record. That figure, they say, will only continue to rise in the coming years. As such, the need for not only a durable adhesive to bond electric motors, but also efficient processes to streamline production and meet high demand, is more prevalent than ever. That is why DELO, having over 10 years of e-mobility industry experience, released DELO DUALBOND HT2990.
Adhesives for electric motors must meet stringent requirements due to their demanding operating conditions. These adhesives must be able to withstand high temperatures, resist thermal cycling, and provide excellent mechanical strength to ensure the durability of motor components. They must resist exposure to chemicals and oils and maintain their bond strength under high vibration and dynamic loads, and in magnet stacks specifically, adhesives often must also offer insulation properties to prevent electrical shorts. DELO DUALBOND HT2990 fulfills these needs with its dual-curing, heat-resistant capabilities, ensuring fast assembly in electric motor manufacturing and robust performance in real-world use.
This adhesive, part of the DELO DUALBOND series of products, is a heat-resistant structural adhesive. It is designed for use in multiple processes, including magnet bonding and magnet stacking, both of which can be found in electric motor manufacturing. It is the first high-temperature adhesive capable of light fixation. Having this second means of curing helps electric motor manufacturers quicken assembly processes, optimizing efficiency in their production.
Light fixation of magnets in electric motors using a high-temperature adhesive.
In magnet bonding, while heat is the standard method of curing, supplementing it with light fixation creates 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 you forego having to keep magnets under a jig in the oven to reach the desired bond line thickness.
The adhesive achieves light fixation in 5–10 seconds, while final curing takes 30 minutes at 150 °C, or 60 minutes at 130 °C. If exposure to heat occurs later in electric motor assembly, for example via heat shrinkage, there is a possibility for the heat curing step to be skipped. Induction curing can be another alternative to oven curing as well.
At room temperature, DUALBOND HT2990 can achieve a compression shear strength of up to 70 MPa on steel. 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 exhibited a tensile shear strength of 7 MPa on aluminum. While this figure may seem small, it is equivalent to 70 kg/cm² of force—a very secure bond.
Here are some key specifications:
To learn more about DELO DUALBOND HT2990 and its applications, please contact us and take advantage of our non-binding project consultation.
DELO is a leading provider of high-tech adhesives. For over 25 years, we have offered solutions for the automotive, electronics, and semiconductor industries. Our innovative technologies set industry standards. Companies like Bosch, Huawei, and Siemens rely on DELO for superior adhesive technologies.
We are your touchpoint for high-tech bonding. Our specialist worldwide are keen to support you. Get in touch with us now!
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