KSB starts series production of the new IE4 motor

Posted: Thursday 24th May 2012

KSB Aktiengesellschaft, Germany, is starting production of its high-efficiency SuPremE electric motor series at the company’s factory in Halle, Germany.

In contrast to conventional synchronous motors, the German pump manufacturer’s motor does not contain any magnetic materials, such as rare earths, which are regarded as critical raw materials, but cannot be mined without considerable environmental impact in the countries of origin.

Because the new drives no longer need failure-prone rotor position sensors, they are as robust and reliable as speed-controlled asynchronous motors. Furthermore, due to the low temperatures within the rotor, the bearings life of this new motor is even longer. The motor, which was first presented as a prototype at the Hanover trade fair in 2009, is equipped with a four-pole rotor that consists of only a laminated core without a cage. The rotor laminations are specially shaped to guide the lines of flux.

Combined with the PumpDrive variable speed system, speeds ranging between 0 and 4,200rpm are possible as a standard. The new synchronous reluctance motors provide users with a technology that is ideally suited to fulfilling the future requirements that energy-efficient pump drives will have to meet. They have at least 15% less power dissipation than that prescribed by Regulation EC 640/2009 for efficiency class IE3 from 2015 or 2017, depending on the motor rating. This means that the motors already reach efficiency level IE4 as per IEC/CD 60034-30 Ed. 2.

In contrast to asynchronous motors, synchronous reluctance motors still have a good efficiency when they are run at partial load. This is often the case in day-to-day operations, where many motors operated in speed-controlled applications mainly run at reduced speed.

KSB plans to supply the motors also to other manufacturers of rotating equipment.




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