{"id":2,"date":"2021-05-03T13:38:33","date_gmt":"2021-05-03T11:38:33","guid":{"rendered":""},"modified":"2023-01-25T16:59:41","modified_gmt":"2023-01-25T15:59:41","slug":"beispiel-seite","status":"publish","type":"page","link":"https:\/\/www.viennamagnetics.eu\/?page_id=2","title":{"rendered":"HomeVM"},"content":{"rendered":"

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ADVANCED MAGNETIC LOSS TESTING<\/h2>\n

>accuracy through physical consistency<<\/h2>\n

VM Precision Lossmeter<\/a><\/h2>\n

Contents (for up\/down scrolling)<\/strong><\/p>\n

<< A >> The Challenge<\/strong><\/a><\/p>\n

<< B >> <\/strong>Today\u2019s Situation<\/strong><\/a><\/p>\n

<< C >> The Concept of ViennaMagnetics<\/em><\/strong><\/a><\/p>\n

<< D >> <\/strong>Advantages of VM Precision Lossmeter versus SST<\/strong><\/a><\/p>\n

<< E >> Video PLM<\/strong><\/a><\/p>\n

<< F >> Options<\/a><\/strong>
\n<\/strong><\/p>\n

<< G >> <\/strong>Summary<\/strong><\/a><\/p>\n

<< H >> <\/strong>Vienna<\/strong>Magnetics<\/em><\/strong><\/a><\/p>\n

<< I >> Team<\/strong><\/a><\/p>\n

<< J >> Contact<\/strong><\/a><\/p>\n

<< K >> Publications<\/strong><\/a><\/p>\n

 <\/strong><\/p>\n

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<< A >><\/a> The Challenge<\/strong><\/p>\n

 <\/strong><\/p>\n

World-wide, reduced energy consumption of electric machines and apparatuses, has become priority, supported by regulations and standards for improved industrial production.<\/p>\n

 <\/strong><\/p>\n

In particular, this concerns electric machines like transformers, generators and motors. They contain cores of soft magnetic silicon iron. It is outmost importance to be able to characterize these materials in exact ways.<\/p>\n

 <\/strong><\/p>\n

However, the so far applied standard test systems yield test results where the absolute accuracy is questionable. The reason is that they are based on a physically not consistent principle that is applied since more than 100 years without significant improvement. Thus, the test results are restricted to approximate comparisons.<\/p>\n

 <\/strong><\/p>\n

The actual challenge results from the increased relevance of modern machines that are not operated with 50 Hz or 60 Hz, but with so-called medium (or \u201ehigh\u201c) frequency, up to several kHz. For example, this is valid for electro-mobility and for energy conversion that is supported by advanced electronics. In general, urgent demand is given for effective measurement systems of predictable absolute accuracy.<\/p>\n

<< B >><\/a> Today’s Situation<\/strong><\/p>\n

At present, two internationally IEC-standardized test systems are available for so-called \u201etechnical\u201c frequencies of 50 Hz, or 60 Hz, respectively:<\/p>\n

 <\/strong><\/p>\n

(i) The Single Sheet Tester<\/strong> (SST; IEC 60404-3) for steel samples of 50 cm x 50 cm size \u2013<\/p>\n

The SST is characterized by high reproducibility. On the other hand, the absolute accuracy is not known, due to the fact that the losses are derived in indirect<\/em> ways from the over-all power consumption of the sum of sample and magnetization yoke system. Further disadvantages are the considerably large size of test apparatus, its extremely high mass and the resulting high costs of system.<\/p>\n

 <\/strong><\/p>\n

 (ii)  The Epstein Frame<\/strong> (IEC 60404-2) for about two dozens of sample strips of 28 cm x 3 cm size \u2013<\/p>\n

Also here, losses are derived in indirect<\/em> Watt-metric ways from the total power consumption of the inhomo\u00adgeneous magnetic frame. Further \u00addisadvantages are time consuming sample prepa\u00adration and handling, as well as errors from slitting and annealing.<\/p>\n

<< C >> The Concept of ViennaMagnetics<\/em><\/strong><\/p>\n

ViennaMagnetics<\/em> offers completely novel solutions that allow for direct<\/em>, accurate, rapid and cost-effective measurements of losses over a large frequency range.<\/p>\n

The VM Precision Lossmeter<\/strong> offers tests up to 1 kHz (with possible extension, up to 10 kHz). As an option, the course of time of induction can be synthesized, e.g. through 5000 points for 50 Hz.<\/p>\n

Absolute accuracy values of estimated 2% result from a concentration on the homogneously magnetized sample region. It shows a 1D Maxwell\/Poynting-Field, as a pre-condition for a physically correct, consistent direct<\/em> determination of losses<\/strong>. The disadvantages of the Watt-metric power measurement at the inhomogeneous magnetic circle is thus avoided. The applied HF magnetization yoke has no direct impact on the results of measurement.<\/p>\n

The test procedure<\/strong> comprises three physically consistent steps:<\/p>\n

(1) precise approximation of induction, with true-field air flux compensation,<\/p>\n

(2) optimized detection of induction and field (by means of a \u201eGiant Tangential H-coil\u201c),<\/p>\n

(3) precise evaluation of instantaneous power p<\/em> and of time-averaged losses P<\/em>.<\/p>\n

<< D >><\/strong> Advantages of VM Precision Lossmeter versus SST:<\/strong><\/p>\n

 <\/strong><\/p>\n