Profile
The tasks of working group “Explosion Protected Electrical Drive Systems“ comprise testing and assessment of electrical drives and complete drive systems as well as protection equipment required for safe operation of explosion protected electrical machines (ATEX and IECEx) including research relating to this range of topics.
Here, another aspect is the thermal evaluation of enclosures with built-in components such as control units used in potentially explosive atmospheres.
Another important focus is put on new research topics concerning all aspects of electrical drive technology performed in cooperation with universities and companies.
Furthermore, technical guidance for users of explosion protected drives is another element in the range of tasks of this working group. For detailled information concerning our range of tasks please refer to the respective websites.
Research/Development
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Aktuelle Forschungsvorhaben
- Ignitability of partial discharges on high voltage windings
F. Lienesch, U. Dreger, M. Hilbert - Efficiency determination on electrical machines
C. Lehrmann, U. Dreger, F. Lienesch - Frequency converter supplied drives designed to “Increased Safety“ type of protection
C. Lehrmann - Advance calculation of the heating of electrical machines in locked state using the
finite-element method
U. Dreger - Permanent-magnet synchronous machines with regard to explosion protection
C. Lehrmann, N, Yogal - Characterization of magnet materials for the application in permanent-magnet
synchronous machines
N. Yogal - Cooperation in the EMPIR-Projekt
19ENG08 WindEFCY "Traceable mechanical and electrical power measurement for efficiency determination of wind turbines"
C. Lehrmann, N. Yogal
Services
Service
- Examination of electrical drives according to ATEX-Directive 2014/34/EU or within the scope of the IECEx-scheme
- Examination of monitoring equipment according to Directive 2014/34/EU
- Manufacturer auditing (QM-audit) according to ATEX-Directive 2014/34/EU
- Technical guidance for manufacturers and users of explosion protected products
Information
Current publications
Publication single view
Conference
| Title: | Measurement of eddy current loss in permanent magnets with high-frequency effects of electrical machines for hazardous locations |
|---|---|
| Author(s): | N. Yogal, C. Lehrmann and M. Henke |
| Journal: | International Conference on Electrical Machines and Systems (ICEMS) |
| Year: | 2019 |
| Month: | December |
| Volume: | 22 |
| IEEE | |
| Conference name: | 22nd International Conference on Electrical Machines and Systems (ICEMS) |
| Harbin, China | |
| Conference date: | 11.-14.08.2019 |
| DOI: | 10.1109/ICEMS.2019.8921966 |
| ISSN: | 978-1-7281-3398-0 |
| Abstract: | The use of permanent magnets (PMs) in the modern motor and generator industry to achieve high performance and high efficiency has increased rapidly. Due to high eddy current loss, the high temperatures that permanent magnets (PMs) can reach increase the chances that thermal demagnetization will take place, resulting in a completely irreversible loss of magnetic properties. To measure the eddy current loss in PMs in the presence of an external magnetic field, which is similar to operating a permanent magnet synchronous machine (PMSM), a closed-loop magnetic measurement system is designed, developed and manufactured. With this symmetrical closed magnetic measurement system, the loss of the PM is measured with varying frequency. Different shapes and sizes of PMs used in the PMSM in this measurement setup are evaluated. The most promising improvements in magnetic loss measurement are analyzed and investigated. |