Special motors for equipment manufacturers
Randax motors are always designed for customer needs, taking account of the process’s special requirements and the customer’s equipment interfaces, while lowering overall product costs!
Randax motors are having very high efficiency level and they can be fully integrated as a part of customer’s equipment. Compact size and light weight of motors help to reduce the size of customer’s equipment and keep them down to a logistically reasonable size!
Reference case 1:
Hollow shaft PM motor series for aluminum induction heater
Randax has developed new hollow shaft motor series for Shanghai Realman Energy Technology Co., Ltd (SHRET), long term client and partner of Randax in China. During 2018 SHRET has developed new state-of-art permanent magnet induction heater for aluminum extrusion called R-PM Heater.
New R-PM Heater is very efficient and is using 25 % - 40 % less power compared to the conventional heating methods. In R-PMH electricity is used only for automation and to run the PM Motor with hollow shaft. Aluminum heating itself is done by rotating heating permanent magnets inside the hollow shaft.
SHRET has used Randax PM motors in their aluminum induction heaters already since 2014, so Randax was natural choice for developing the new type of heater motors as well. New R-PM Heater is using hollow shaft motors developed by Randax. Motors types and power levels are as follows:
Motors are having unique design with aluminum frame including both water- and aircooling. Hollow shafts are very large with diameter of 340 mm and 520 mm while frame diameters are 900 mm and 1190 mm. Large hollow shaft is used for connecting the heating magnets in and aluminum billets are heated by rotating heating magnets inside the hollow shaft.
Compact and high efficient Randax motors enables R-PM Heater to be most efficient choice in aluminum extrusion market and to keep the overall equipment size at a reasonable level.
Reference case 2:
Custom-made special motors for Effmag induction heaters
Effmag Oy and SHRET manufactures energy-efficient induction heaters for the aluminium extrusion industry. The new heater type has an efficiency ratio of approximately 80%, which is substantially higher than that of other heaters on the market. Since the process requires a great deal of energy, this results in substantial cost savings during the equipment life cycle. Use of compact Randax® motors has improved the efficiency of the equipment and reduced the size of the induction heater.
Randax developed tailored PM motor of 90kW@4500rpm for this purpose with high IE4 class efficiency. The motors that Randax developed for Effmag Oy allowed the firm to optimise the number of permanent magnets required for the heater, enabling a smaller heater which would fit into a sea transport container. A suitable bearing system, based on oil circulation and precision bearings, was designed at the same time to accommodate the bearing loads which occur at high rotation speeds.