HIOKI IMPULSE WINDING TESTER ST4030

                                 Diagnose the Insulation Quality and Deterioration of Rotor Windings while in Assembled State via Response Waveform Quantification

 

The ST4030 is an impulse winding tester that combines the functions of both a resistance meter and insulation-withstand testing required for electric motor winding manufacturers to improve quality.  Meet the needs of more reliable motor windings in light of the increasing use of electric vehicles and self-driving technology.

Key Features

• Identify previously undetectable defects

• Detect waveforms with high precision (200 MHz high speed sampling × high 12-bit resolution)

• Identify single-fault turns via quantification of response waveforms

• Diagnose defective insulation (pseudo-shorts) between motor windings by testing for microscopic partial discharges hidden in noise (option)

 

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https://www.hioki.com/en/products/detail/?product_key=6495


 

 

High-precision waveform detection

Slight changes in response waveforms that make it difficult to distinguish the difference between good and defective coils can be detected with a high level of precision. The 200MHz high-speed sampling captures sudden changes with remarkable detail, and the 12-bit high resolution provides the clear differences between the waveforms. Detect shorts among even just a few turns Quantification of response waveforms now make it easy to identify the differences in the coil among even just a few turns, an ability that has been difficult in the past. The LC and RC distribution between compliant and non-compliant products provide a clear criterion to make informed decisions.

Detect hard to identify shorts among even just a few turns

Quantification of response waveforms now make it easy to identify the differences in the coil among even just a few turns, an ability that has been difficult in the past. The LC and RC distribution between compliant and non-compliant products provide a clear criterion to make informed decisions.

 

Testing after rotor assembly

Once the rotor has been attached to the motor’s stator, the stray capacitance between the rotor and stator will vary depending on the position at which the rotor was attached. This variation in stray capacitance means that the response waveform obtained during impulse testing varies, preventing use of the conventional waveform comparison method. Although the LC and RC values used to quantify response waveforms also vary due to variations in those waveforms, the distributions of those values vary for defective and non-defective parts. Consequently, impulse testing can be performed after the rotor has been installed as long as defective and non-defective part judgment areas have been created.