Before motors for the maritime industry can be released on the market, they must undergo several thorough tests and be classified by independent inspectors. Until recently, Hoyer was dependent on external testing facilities to test and classify motors, but by opening a new testing center at the company’s Asian headquarters, located in Ningbo, China, Hoyer is now able to conduct this process internally.
“Previously, we had to take a number and queue up, which resulted in longer delivery times and less flexibility. Today, however, we’ve combined all our testing in relation to maritime classification at our new testing center, which means greater flexibility and security of supply for our clients,” explains Tuomas Bejstrup-Jäppinen from the Hoyer Sales Department, which has the primary responsibility for motor classification.
When Hoyer delivers motors to the maritime industry, an ‘A test’ must first be performed on one version of a specific motor, which is followed by a ‘B test,’ or a routine test for additional motors of the same type. This process results in the desired classification. When a motor has undergone the A test at Hoyer Ningbo, this means that a similar motor can be delivered directly from the warehouse in Denmark, where the B test can also be performed without further delay, as the approval applies to the motor type in general.
Testing leads to faster delivery times in both Asia and Europe
From now on, Hoyer Asia will use the new testing center to conduct both A and B tests. Hoyer Europe, for its part, will use both the new testing center and a Danish testing center for A tests, while B tests will be conducted at Hoyer’s Danish headquarters.
“The strategy of establishing our own testing center while continuing to use an external classification partner in Denmark gives the entire classification process greater flexibility, improved quality control and faster classifications. For large-scale projects, this also means we can test the entire project in Ningbo. As such, it is classified and ready to be shipped to the client as soon as it arrives at our warehouse in Denmark,” Tuomas Bejstrup-Jäppinen explains.
Local process means greater efficiency
The international classification society DNV/GL sees the new testing center as a clear advantage for Hoyer.
“The testing center’s facilities are great, and the operators are highly skilled. The center reduces noise and vibrations during the testing phase, which gives us a quality working environment. Finally, the test results are automatically compiled on-site, and that streamlines the entire process,” says Pan Yingjie, Product Manager for DNV/GL in China.
Testing motors with up to 450 kW capacity
At the new testing center, Hoyer can conduct its own thorough type tests − or A tests − which take 4-5 hours to complete.
“We can test motors up to 450 kW at the new center, and we’re able to test voltages between 110 and 830 V at the frequencies 50 or 60 Hz,” Tuomas Bejstrup-Jäppinen adds.
Hoyer’s testing process
Professional classification societies monitor and validate the actual testing process, which consists of a series of specific measurement tests:
- Examination of technical documentation and visual inspection
- Insulation resistance measurement
- High voltage test
- No load test
- Winding resistance measurement
- Verification of bearings
- Load test