Bauer Motors provide efficiency advantages in partial load applications

The specially developed Bauer permanent magnet synchronous motors of course meet the legal requirements of IE3 and IE4. Their strength lies however in their use in the partial load region. Owing to the use of Bauer permanent magnet synchronous motors, in standard applications under partial load conditions often more than 30 % energy savings can be achieved compared to the asynchronous motor technology.

Reducing power supply output saves money

End users and machine manufacturers benefit from the higher energy efficiency that can be achieved by careful product selection from the most appropriate component manufacturers. In many applications a smaller permanent magnet synchronous motor can be used instead of an asynchronous motor, which allows the choice of smaller components along the whole drive chain. Accordingly, machine manufacturers can not only improve the efficiency but can also optimise the costs of the overall system. Additional energy savings reduce the power costs for the end user and lower the power output, and thus the operating costs of the whole production site.

IEC 61800-9 (EN 50598) enables partial load losses of the whole system to be determined

IEC 61800-9-2 (EN 50598-2) shifts the focus from the individual component to the efficiency of the whole drive system. The new efficiency classes (International Efficiency for Systems, IES) allow a simple determination of the total losses for a whole drive system (PDS).

Since in the future all component manufacturers will disclose their loss data according to this new standard, optimised applications can be designed with a very wide range of different components. The new Standard will allow a very accurate preliminary calculation of the power losses, so that the ROI (Return of Investment) can be reliably determined. Up to now the overall efficiency of speed-regulated electric motors was estimated with the aid of approximate energy consumption calculations.

It is now possible to determine for the 8 operating points defined in the Standard the total losses of a system, including the partial load operation, via a simple addition of power losses. Bauer helps its customers to avoid having to rely on system solution providers, so as to ensure that their systems will retain a competitive advantage also in the future.

Bauer customers will obtain for all components clarity on the loss data according to IEC 61800-9 (EN 50598) and will thereby be in a position to determine the total losses. Today, customers can already optimise their systems with Bauer in order to protect their core knowledge.


Bauer welcomes together with EN 50598 also the new IEC 61800-9 standard and is convinced that it will bring additional energy savings to the end user, since the overall application has been optimised. The efficiency of the electric motor is no longer considered in isolation. The life cycle costs are transparent and the plant or machine manufacturer enjoys a high degree of freedom in selecting the most appropriate drive components.

We are now a part of Regal Rexnord.