At ensuring product's lifetime, tightness plays a crucial part. To ensure tightness an appropriate measuring method must be developed. This paper presents four measuring methods for leak testing using a tracer gas. We performed leak tests on the considered stators. On the basis of the results, we evaluated the measuring methods and chose the most suitable for later control in production. We proposed most necessary improvements for the chosen method. We also located the most common sites of stator leakage.
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