In the field of the production of stator and rotor stacks for electric motors, several systems are available for industry to implement a “single body” provided with the opportune stability. The most common machining processes include interference, interlocking , welding, crimping or point-to point bonding. The stacks manufactured with the “Backlack” process stand out for high rigidity and high electromagnetic efficiency.
Thanks to the use of this technology, the laminations composing stator and rotor stacks stably adhere one another thanks to a glue that acts on their entire surface. The “Backlack” sheet metal, in fact, is uniformly coated on both sides by insulating paint with adhesive characteristics. When the adhesive properties are activated, each portion of a lamination surface is steadily anchored to the one of neighbouring laminations, conferring strong compactness to the systems and at the same time maintaining a perfect electric insulation. Those features have facilitated its use, until now, in the sectors where rigidity and electromagnetic efficiency are very important, in particular in hybrid and electric cars, in energy generators and in electro-medical equipment.