Siemens to build advanced 2-pole electric motor

In addition to the motor, the contract includes delivery of a 40MW Sinamics GL150 starting frequency converter. This LCI-converter (load commutated inverter) is designed for single-motor applications with variable and constant torque characteristics. As a result of the low switching losses and the low loss thyristor technology, the efficiency of the LCI converter is extremely high and lies at 99%.

The drive system will be part of an energy storage project. Energy storage technologies have been viewed as a supporting key technology for the energy revolution and a national strategic emerging technology in China. This kind of technology holds decisive advantages such as high capacity, low costs, high efficiency, and environmental friendliness.

The plants operate by using motors to drive compressors, whose energy will be stored in suitable storage vessels. The stored energy can be released to drive an expander, which in turn drives a generator to produce electricity. Compared with other energy storage technologies, the plants have a very large power rating and storage capacity, low self-discharge, and a long lifetime. These attributes make it a cost-effective method for bulk energy storage grid services.

The motor will be manufactured at the Siemens Dynamowerk Berlin, Germany, the company's oldest manufacturing.

Hermann Kleinod, CEO of Siemens Large Drives Applications (LDA), comments: “Once completed, this project will be the largest and most efficient energy storage station in the world. We are happy to support our customer in the energy transition and this project with a drive system that sets a benchmark – a world-leading 2-pole electric motor with an efficiency of above 98%.”

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