The inspection of motor windings is changing. From one-turn shorts to detecting defects in the rotor assembly state!
The applied voltage has been increased to a maximum of 4200V, and the ST4030 has been reborn as the ST4030A! ● By quantifying the response waveform, a one-turn short can be identified. ● Impulse testing can be performed in the rotor assembly state based on LC and RC values. ● The discharge detection function (optional) accurately detects pseudo-shorts. ● Captures and does not miss subtle changes in the waveform with high-speed sampling × high resolution × long waveform. ● Reduces variation in applied voltage, achieving high accuracy in defect detection. ● Complies with the insulation breakdown voltage test (BDV) required by standards.
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basic information
● The numerical representation of the response waveform allows for the detection of a one-turn short. In conventional impulse testing (layer short testing), the judgment was made by calculating the area difference between the specified A-B cursor interval's "master waveform" and "test waveform." With the ST4030A, by quantifying the response waveform, it is possible to determine defects that are difficult to judge based on area differences as either good or defective products. *For the motors that can be detected, please refer to the "Testable Inductance Range" on the last page of the catalog. However, depending on the test conditions and judgment criteria, it may also be possible to make judgments, so please consult us for prior confirmation with a demo unit. ● Testing is possible in the rotor assembly state. When the rotor is assembled to the motor stator, the stray capacitance changes, making it impossible to test with the conventional waveform comparison method. The LC and RC values of the quantified response waveform differ in distribution between good and defective products even if the response waveform changes, allowing for the establishment of judgment areas for testing even in the rotor assembly state. ● The discharge detection function (optional) allows for high-precision detection of pseudo-shorts. Among the high-frequency components appearing in the response waveform, noise components that appear throughout the entire waveform are removed, and only the partial discharge portions are extracted for judgment.
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Applications/Examples of results
Impulse test of motor windings (layer short test)
Company information
HIOKI is located on a green hill overlooking the city in a corner of Shioda-daira, known as the Kamakura of Shinshu, in the suburbs of Ueda City, Nagano Prefecture. All departments are gathered here, and development, production, and sales/service work in unison to continuously provide advanced measurement technology to the world. For a company to thrive, it is essential for each of us to maximize our abilities while also being good corporate citizens. We believe that embodying the principles of "respect for humanity" and "contribution to society" is the corporate social responsibility. To achieve this, we are aware of our respective social responsibilities and strive to become trustworthy individuals for all stakeholders, while always challenging ourselves to create high-value-added enterprises through our pursuit of being one-of-a-kind, and to provide high-quality products and the best services.
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