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 is possible in the rotor assembly state with judgment based on LC and RC values. ● The discharge detection function (optional) accurately detects pseudo-shorts. ● Captures subtle changes in the waveform without missing them, with high-speed sampling × high resolution × long waveform. ● Reduces variation in applied voltage, achieving high accuracy in defective product detection. ● Also supports insulation breakdown voltage testing (BDV) as required by standards.
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basic information
● The numerical analysis of the response waveform allows for the detection of a one-turn short. In traditional impulse testing (layer short testing), the judgment of pass or fail was determined 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, defects that are difficult to judge by area difference can be classified as good or defective products. *For the motors that can be detected, please refer to the "Testable Inductance Range" in the specifications on the last page of the catalog. However, it may also be possible to make judgments depending on test conditions and criteria, so please consult us for pre-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 using the traditional 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
In the suburbs of Ueda City, Nagano Prefecture, in a corner of Shiodan Valley, known as the Kamakura of Shinshu, HIOKI is located on a lush green hill overlooking the city. 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 also aiming to create a high-value-added company through our ongoing challenge to be one-of-a-kind, providing high-quality products and the best services.
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