Stator- und Rotortechnik Content: Stack welding Stack bonding (Backlack) Research and Development Blanking, Single Notching Segmented Stators and Rotors Precise bonded Stacks Interleaved Cores Laminar Planer Head
Stack welding Welding stacks is one of our core competencies. We have been using different welding techniques and know the strengths and weaknesses of each. We have optimized not only the welding recipes, but also the machines to get the best results with stacking electrical steel. We have developed and built complete welding machines with automation and documentation for mass manufacturers. Another of our specialties is the welding of electrical steel with a high silicon content. Our services start long before welding the stacks, when the geometry of the laminations is developed to suit the welding technique. We help you achieve process capable production and avoid expensive tool modifications. We have been using plasma welding for stacks of electrical steel since 2007. Our own machine controls the height of the stack and produces up to six welds simultaneously. Long lifetime Reduction of spatter Narrow focus Control of the process Short process time by using several torches During 2009, we developed a laser welding machine for stacks of electrical steel. Special lenses allow welding on the inside of stacks, the cross section of the weld can be controlled precisely. plasma welding Low maintenance Less distortion Higher strength Higher welding speed Capability of deep welds Less susceptible to variation in material properties Capability of welding thicker isolation and thinner sheets laser welding We have been using the more traditional techniques like TIG and resistance welding since 1975. Through continued improvement of the machines and tools, we could enhance quality and lifetime significantly. We are welding both automatically and manually.
Stack bonding (Backlack) We have been working with bonding varnish (Backlack) since 1998 and have helped develop the materials and processes. We now have a lot of experience concerning strength, processing and ageing. The advantages over other stacking techniques are widely recognized. By using standardized test specimen, we can compare different bonding varnishes and find optimal curing parameters. We are working with major electric steel manufacturers to further improve Backlack. At the same time, we are developing the stacking processes to improve quality and lower costs. We are currently producing several series for motor manufacturers and automotive suppliers, with further projects in development stage. High strength of the stacks Stacks can be machined Higher stacking factor Great accuracy of the stacks Virtually no cushioning Flexible design of shape Laminates are isolated, rarely shorts Simpler stamping dies Less liquid absorption The combination of these properties allows the development of new applications and the integration of functions. Segmentation of stators and rotors Joining of shafts with frictional connection Joining into housings Joining of magnets bonded segments
Research & Development / Blanking, Single Notching In research and development projects, we can use our decades of experience with electrical steel. Our aim is to develop the perfect stack for the given application. One of our specialities are frictional connections Formbohrung between stacks of steel sheet and shafts, magnets or housings. They are easy and cost effective in assembly and safe in operation. The use of heat, cold or clamps are superfluous. The frictional connection works safely over the entire tolerance of the shaft or housing. When state of the art is not good enough, we are developing new processes, tools and facilities. The goal can be to increase the performance of your product, improve quality or allow effective serial production. We have various specialized partners to realize big projects successfully. welding test component Blanking is used for economic serial production with formidable repeatability. We are able to please high demands concerning burrs and tolerances. Our machinery comprises punching machines from 12-130 tons of force. For prototypes and small series, we do single notching and blanking in compound dies. Compared to progressive dies, the cost are much lower. Our core competencies are: Small progressive dies Blanking in compound dies Single notching Parting Electrical steel starting from 0.1 mm
Segmented Stators and Rotors For some years we have been producing segmented stators and rotors with bonding technology. The main advantages are material saving and easier subsequent processing. The connection of the segments is choosen according to the requirements and assembly. Stators made of bonded segments can be pressed into the housing. Segmented rotors withstand high speeds and can be pressed onto the shaft. Bonded stator segments offer the following advantages: High strength Small tolerances Simple stamping tool Big material savings compared to full stator Easy to isolate and wind automatically Higher winding density Uniform magnetic properties Short delivery time Production ramp-up follows the demand Sheet thickness from NO10 to M800-65A We are gladly supporting you from design up to series production: Optimize the shape for manufacturing and assembly Strip layout for punching, stacking and connection technology Raw material, stamping and bonding tools Production processes and quality control stator Ø650 mm stamped as segments
Precise bonded Stacks One of our specialties is the production of small, precise stacks from 0.1-0.3 mm electrical steel with bonding varnish (Backlack). We can provide everything from the strip layout until the finished and checked stack. This includes design and manufacturing of the stamping tool, production of the parts and quality control. For example, we are producing circular and slotted stators from NO20 with a diameter of 20 mm and a length of 10-60 mm. Starting from a bore of 4 mm, shafts can be joined with a frictional connection. These stacks are similar in strength and precision to solid, turned parts, but with the magnetic advantages of thin electrical steel. Advantages over interlocking: Small stack tolerances High strength and stiffness Small wall thickness Uninterrupted isolation Higher stacking factor Suitable for: Stators Rotors Magnet carriers Back Iron Segments
Laminar Planer Head / Interleaved Cores In 2003 we developed a laminar planer head for power tools. The design is completely new with a pre-stacked, asymmetric construction. Despite using only one blade instead of two, cutting performance is increased. The integrative design also led to reduced cost. One revolutionary approach is the forcedisplacement assembling of the body, shaft, bearing and belt pulley. We are producing three different diameters Process capable serial production Reduction of parts count Cost reduction through simpler shafts Saving of one carbide blade through reduction of imbalance Pre-stacked body with length tolerance smaller than sheet thickness We would be happy to produce heads for your planer or analyse the potential of laminar design for your application. We are manufacturing Interleaved Cores from steel strips. These are stacked by hand according to customer request in several different types. Our services include a customized logistics solution and the necessary parts to assemble the cores. A specialty is the Just in Time delivery to eliminate stock-keeping on the customer side. E and I cores are precisely matched in height Delivery of exactly the right quantity at the right time directly into assembly 100% checked products including the additional parts (screws etc.) Bespoke returnable packaging simplifies assembly and reduces cost
Stator- und Rotortechnik SWD AG Stator- und Rotortechnik is an innovative medium-sized company in Switzerland. We are dedicated to the development and production of lamination stacks and support our customers with new technologies from prototypes up to series production. SWD AG Stator- und Rotortechnik Kaisermatt 3 5026 Densbüren Schweiz Phone: +41 (0) 62 867 92 18 Fax: +41 (0) 62 867 92 15 E-Mail: info@swd-technology.com Website: www.swd-technology.com Version 20140611