Industry News

Highly efficient industrial 11kW permanent magnet synchronous motor without rare-earth metals - Real

By Suzi | Published on Nov 25,2015

April 11, 2012

Tokyo, 11th April 2012 - Hitachi, Ltd. (NYSE:HIT / TSE:6501) today announced a 11kW highly efficient permanent magnet synchronous motor co-developed with Hitachi Industrial Equipment Systems Co., Ltd., without using magnetic material containing rare-earth metals such as neodymium and dysprosium. The motor employs an iron-based amorphous metal(1) in the core, the heart of the motor.

In 2008, Hitachi and Hitachi Industrial Equipment Systems established basic technology for a raremetal-free motor. In order to further increase capacity and efficiency, technologies such as structural optimization and loss minimization for the core were developed, and applied to realize a medium capacity 11kW motor. In comparison to conventional motors of the same class, the motor developed is smaller and achieves an energy efficiency of approx. 93 which fulfills the highest standard of IE4(2) in the efficiency guideline set out by the International Electrotechnical Commission (IEC). Technology development will be pursued with view to product launch in FY2014.
A part of this work was supported by The New Energy and Industrial Technology Development Organization (NEDO), Japan as part of its support program for the development of practical technology to substitute or reduce rare metals.

In recent years, as part of the increasing social awareness of environmental issues such as global warming, there has been a growing interest in technology that increases the efficiency of electrical equipment and conserves energy. Although greater efficiency of motors using rare-metal magnets is also being pursued, there is a growing need to recycle the rare-metals or to replace them with substitute materials from the standpoint of dwindling resources.
In response to this need, Hitachi and Hitachi Industrial Equipment Systems, employed amorphous magnetic metal in the core and developed basic technology for an axial gap motor which raises motor efficiency without a magnet containing rare-metals, resulting in a prototype small capacity 150W class motor in 2008. To achieve higher capacity and efficiency levels, however, the development of a highly resilient motor structure and material to reduce energy loss are necessary. Thus, Hitachi and Hitachi Industrial Equipment Systems developed technology to optimize the structure of the axial gap motor to efficiently use low-magnetic ferrite material and a stratified core structure which efficiently draws out the low-energy loss characteristic of the amorphous metal, to achieve an industrial 11kW highly efficient permanent magnet synchronous motor without rare metals. Features of the technology developed are as below :

(1)Amorphous metal : Solidified by rapid cooling, the metal has unique characteristics compared to normal crystalline material.

(2)IE4 : Currently the highest standard set out in IEC60034-31, the IEC guideline for motor energy efficiency.

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