{"id":17862,"date":"2023-08-22T10:30:20","date_gmt":"2023-08-22T08:30:20","guid":{"rendered":"https:\/\/mag.ebmpapst.com\/en\/?p=17862"},"modified":"2024-06-19T15:02:58","modified_gmt":"2024-06-19T13:02:58","slug":"insight-into-our-testing-centerfeeling-giddy-test-bay-impeller-strength-spin-and-cycle-test","status":"publish","type":"post","link":"https:\/\/mag.ebmpapst.com\/en\/insights\/insight-into-our-testing-centerfeeling-giddy-test-bay-impeller-strength-spin-and-cycle-test_17862\/","title":{"rendered":"Insight into our testing center<\/i>Feeling giddy: Test bay impeller strength, spin and cycle test"},"content":{"rendered":"\n

In the testing center in Hollen\u00adbach, fans are pushed to their limits and beyond with real-life envi\u00adron\u00admental influ\u00adences. New prod\u00aducts, sizes or compo\u00adnents pass through the test stations in a total of six test fields over an area of approx\u00adi\u00admately 2,500 square meters. In this series, we take a closer look at each of these test bays. The third focuses on impellers made of metal and plastic.<\/p>\n\n\n\n

In the testing center, ebm-papst not only tests complete fans, but also their indi\u00advidual compo\u00adnents, such as impellers. Their dura\u00adbility is inves\u00adti\u00adgated in the \u201cImpeller strength, spin and cycle test\u201d bay designed specif\u00adi\u00adcally for this purpose. The tests are carried out on new prod\u00aducts \u2013 during and after devel\u00adop\u00adment \u2013 and when intro\u00adducing new sizes of existing fan series.<\/p>\n\n\n\n

In the cycle test, metal impellers have to run many start-stop cycles and prove their load capacity. (Photo | Lukas Zwies\u00adsele | ebm-papst)<\/figcaption><\/figure>\n\n\n\n

All three impeller tests are ramped-up tests, meaning that the test spec\u00adi\u00admens run at a signif\u00adi\u00adcantly higher speed than they are later approved for. The load is compressed into a shorter period of time. In this way, the load in the field can be simu\u00adlated from the speed and dura\u00adtion. There\u00adfore, the engi\u00adneers iden\u00adtify possible weak\u00adnesses very quickly, before the impellers are released to do real work.<\/p>\n\n\n\n

Impeller strength test bay<\/h2>\n\n\n\n

In the impeller strength test bay, plastic impellers are mounted on a total of 11 test benches and oper\u00adated for 28 days in a row. The focus here is on the special prop\u00ader\u00adties of the plastic mate\u00adrial: How does it behave over time when centrifugal force and thermal loads act on the fan? After the 28 days, the experts in Hollen\u00adbach test the plastic impeller: How strong has the mate\u00adrial been? Has the tip gap between the impeller and housing changed thereby? Here, the engi\u00adneers are guided by stan\u00addard values and their own expe\u00adri\u00adence. This ensures that the effi\u00adciency and noise gener\u00adated by the impeller do not enter a crit\u00adical range over its oper\u00adating time.<\/p>\n\n\n\n

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The spin test bay is made for metal \u2026 <\/figcaption><\/figure>\n<\/div>\n\n\n\n
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as well as plastic impellers. (Photo | Lukas Zwies\u00adsele | ebm-papst)<\/figcaption><\/figure>\n<\/div>\n<\/div>\n\n\n\n

Spin and cycle test bay<\/h2>\n\n\n\n

The spin test bay features test benches for metal and plastic impellers in different sizes, including for compact fans. Assem\u00adbled on test benches, this is where the maximum oper\u00adating speed and the destruc\u00adtion speed are deter\u00admined, so it can easily come to breaking point here!<\/p>\n\n\n\n

The test cabi\u00adnets contin\u00adu\u00adously carry out start and stop cycles on metal impellers to iden\u00adtify the maximum oper\u00adating speed and detect poten\u00adtial weak\u00adnesses in the mate\u00adrial. The test rigs for the cycle test have a drive power of 36 kW and 45 kW, respec\u00adtively, and can thus run at maximum speeds of 15,000 rpm and 6,500 rpm, respec\u00adtively. And this with impellers of sizes 450 to 1,250.<\/p>\n\n\n\n

Mr. Kemmer, how do the loads on the metal impellers differ?<\/h3>\n\n\n\n