Impermeable packaging enables integrated cooling

Mit zwei Reihen vergleichsweise kleiner Klebepunkte lässt sich eine nahezu vollflächige Verklebung und damit eine zuverlässige Abdichtung zwischen den Blechen erreichen. © Feintool

Efficiency and performance of motors are crucial in electromobility. These include the stability of the packages and their tightness for coolant. The Glulock MD (Multiple Dots) bonding process gives rise to expectations of dense and stable electric motors, even in the high-temperature range.

Increased efficiency in electric motors are not only targets set by the automotive industry, but also enshrined in the regulation of efficiency classes for industrial motors. The required increase in performance is achieved by modern grades of electrical steel. At the same time, the sheet thickness is reduced, which increases the electrical efficiency.

In the area of joining methods, market analyses show a trend toward bonding laminates. This increases performance and reduces losses in the engine. Feintool offers Glulock MD, a joining technology with commercial and technical advantages for customers.

High efficiency and stable at high temperatures

Compared to conventional stacking methods, Feintool says Glulock “proves to be inexpensive, precise in design and with significant improvements in stacking tolerances for parallelism, shape accuracy, runout and length tolerance.” In addition, the output power increases or the motor size decreases with the same output.

Noise generation and eddy current losses are also reduced. The packaging of thin sheets (0.1 mm) can also be realized with Glulock. Glulock HT (High temperature) is a continuation of the previous series gluing method. Strength and media resistance improve and allow increased temperature resistance up to 180°. For example, Glulock HT can be used in ATF oil within temperature class H.

Tightness as a new challenge

Further developments in electric motors show that, in addition to the growing mechanical and thermal requirements, their cooling also has potential for optimization. The trend is for the motors not to be cooled externally, but for the cooling to be integrated into the rotors and stators. This requires impermeable packaging, waterproofing, and surface bonding.

With Glulock MD, it is possible to place several adhesive dots on the sheet in such a way that an almost full-surface bond is ensured. Tests have already confirmed the required leak tightness. Bonding to the yoke and tooth ensures stability.
The patented bonding processes offer a solution for electric motors with high quality requirements in terms of stability, electrical efficiency, media and temperature resistance, and tightness. This makes it possible to achieve advantages in cooling options as well as to advance the development of electromobility.

Markus Lock, Head of Engineering, is convinced: “With the existing technology portfolio, its consistent further development, and our proximity to customers and the market, I am firmly convinced that we have already found the right answers to the requirements of the future.”

The Feintool Group

Feintool is an internationally active technology company in the fields of fineblanking, forming and e-sheet stamping for processing steel sheets. These technologies are characterized by economy, quality and productivity. As an innovation driver, Feintool is constantly pushing the boundaries of these technologies and developing intelligent solutions for customers’ needs: on the one hand, high-performance fineblanking systems with innovative tools and state-of-the-art manufacturing processes, and on the other, overall processes for precise fineblanking, forming and stamped electrical sheet components in high volumes for automotive and demanding industrial applications.

The processes used support the trends in the automotive industry. Feintool is a development partner in the areas of lightweight construction/sustainability, platform and automated drive concepts, electric drives and hybrids.
Founded in 1959 and headquartered in Switzerland, the company has 19 of its own production plants and technology centers in Europe, the USA, China and Japan, which means it is always close to its customers. Around 3500 employees and 100 trainees work on new solutions worldwide.