MICROTEST MT-6913 motor stator testing system provides 13 channels for testing. It enables polarity (rotation direction) testing of motor stators and utilizes precise four-wire measurement technology to measure DC resistance. It integrates safety withstand voltage insulation and inter-coil short circuit testing in a single system. It supports PC connectivity software for remote programming and storage of test data. The system can be PLC-controlled and can accommodate customized testing fixtures for customer-provided stators. Additionally, an optional LCR meter can be selected for inductance value testing of the stator, with a testing frequency range of 10Hz to 200kHz, including support for three-phase balanced inductance testing.
Selection
| Model | MT-6917 | MT-6913 | MT-6913L | MT-6910 |
| Test Channel | 17 | 13 | 13 | 8 |
| DCR Range | 0.1mΩ-100kΩ | 0.1mΩ-100kΩ | 0.1mΩ-150Ω | 0.1mΩ-100kΩ |
| DCR Accuracy |
Low Resistance 0.1mΩ-1Ω ±(0.2%±1mΩ) |
Low Resistance 0.1mΩ-1Ω ±(0.2%±1mΩ) |
Low Resistance 0.1mΩ-200mΩ ±(0.1%±0.5mΩ) |
Low Resistance 0.1mΩ-1Ω ±(0.2%±1mΩ) |
|
High Resistance 1Ω-100KΩ ±0.1%
|
High Resistance 1Ω-100KΩ ±0.1%
|
High Resistance 200mΩ-1Ω ±(0.1%±2mΩ 1Ω-150Ω ±0.5% |
High Resistance 1Ω-100KΩ ±0.1%
|
SPEC
| Model | MT-6913 / MT-6913L |
| DC Resistance Test | |
| DCR Range |
0.1mΩ-100kΩ (MT-6913) 0.1mΩ-150Ω (MT-6913L) |
| Measuring Mode | 4-Wire |
| Safety Hi pot Test | |
| AC Output Voltage | 100V-3000V |
| AC Leakage Current | 0.001mA-10mA |
| AC Arcing Detection | Detect gears from 0-9 |
| DC Output Voltage | 100V-3000V |
| DC Leakage Current | 0.001mA-5mA |
| DC Arcing Detection | Detect gears from 0-9 |
| IR Output Voltage | 100V-1000V |
| Insulation Resistance | 1-9999MΩ |
| Measuring Time | 0.1-99.9s Continuously adjustable |
| Voltage Accuracy | ±(3% of setting+5V) |
| Impulse Winding Test | |
| Impulse Voltage (programmable) | 200V-3000V |
| Impulse Voltage Accuracy | ±2% |
| Total area comparison |
When layer short happened, the loss of power on coil increase, the resonance damping coefficient increase, resonance amplitude decrease, the total area decrease. These are the basic parameters we check layer short. By calculating and comparing the deference of area between golden sample and DUT. |
| Differential area comparison |
Add up the difference between normal wave and DUT wave call “ Area differential”. By calculating and comparing the deference of area between golden sample and DUT. To determine the degree of waveform overlap. |
| Wave comparison | Set a acceptable wave range, if the DUT’s wave is in this range shows “pass” otherwise, “fail” This parameter can judge both amplitude and phase of resonance wave. This can increase the detection capability of layer short. |
| Corona comparison | In pulse test, the insulation defect will cause discharge and create corona. This function is able to count the times that corona happened base on the degree of deviation. Detect the discharge phenomenon on the coil. |
| Flat comparison | If the layer short happened, the waveform will tremble. Therefore, the instrument will quantize and compared it. |
| Inductance Measurement (Option LCR Meter 6365) | |
| Inductance Ranges | 0.1nH - 99.999KH |
| Test Frequency | 10Hz-200kHz |
| Frequency Output Accuracy | ±0.01% |
| Frequency Resolution | 5 Digits |
| AC Drive Level | 10mV to 2Vrms (1m Vrms resolution) |
| Basic Accuracy | ±0.1% |
| Three-phase Inductance Balance Test |
Comparison Mode
|
SYSTEM
| Test fixture | According to the test requirements | |
| Indicator | Pass/Fail Screen Diaplay/Sound | |
| Built-in Storage | Storage of 100 rewritable data sets | |
| Operation | Manual, RS-232 | |
| Power Supply | Voltage | 90-132Vac or 198-264Vac |
| Frequency | 50/60Hz | |
| Power consumption | 300VA | |
| Environment | Temperature | 10℃-40℃ |
| Humidity | 20-90%RH | |
| Display | 6913/6913L | 5.7" dot-matrix display (320*240) |
| 7605 | 4.3" TFT LCD (480*272) | |
| 6365 | 7.0" TFT (800*480) | |
|
Dimension (W*H*D) |
6913/6913L | 435x190x522mm |
| 7605 | 435x145x522mm | |
| 6365 | 435x145x522mm | |
| Weight | 6913/6913L | 15 Kg |
| 7605 | 14 Kg | |
| 6365 | 3 Kg | |
| Interface | RS-232 | |
Stator Coil/Core
The purpose of stator core is to be part of the magnetic route and the place to fix the stator coil. This core is made of couple 0.5mm silicon steel sheets. To lower the magnetic loss, the core will cover by insulating paint to isolate each piece. There are couple sockets in the core to fix the stator coil.
Stator coil is an important component of motor. The purpose is to create inductance by current. There are single layer and double layers on the iron core.
Uneven DCR happen in 3-pase motor, this will cause uneven rotate.
MICROTEST 4-Wire DC Resistance measurement will be more accurate than others.
Customized test fixture for stator coil
For Enameled Winding of Motor
MICROTEST Motor Stator Testing System is One-Step-Test Function
Low Voltage Electrical Test + Hipot Test + Layer Short
Important Parameter for Quality of Coil
Introduction of Impulse Tester
Impulse Winding Tester use the comparison of pulse to measure the DUT. The instrument provide high voltage to do the instant pulse test and record the wave. Compare with the golden sample to define the product.
Why do we need impulse tester for producing motor/transformer?
Impulse Test = Quality and product life test
The small defection is hard to find at low voltage test station. As the DUT goes to the final assembly test, the defect may show up. This will higher the cost of production.
Motor and transformer usually work under high voltage. If we add impulse test in the product line, this may prevent the malfunction or burn on motor.
| L | is the DUT coil |
| C1, C2 | are the resonant capacitors in the instrument |
| R1, R2, R3 | is the resistant in the instrument and the DUT |
| Technology of Detect Layer Short | |
| → 1 | Charge the C1 capacitor to the certain testing voltage level. |
| → 2 | Trigger the SCR by pulse |
| → 3 | DUT will resonate with C1 and C2 |
Technology of Detect Layer Shor
“Pulse voltage and waveform comparison” is the way we detect layer short. The pulse voltage is non-destructive/instant voltage that apply on both side of winding and detect the DUT without damage it. By compare the wave with the golden sample, we can judge the DUT.
Damping wave under L/C resonate comes from the feature change of defect coil.
By comparing the wave of damping attenuation between golden sample and DUT
Provides 5 waveform comparison
Standard Accessories
| Power Cord | |
| RCA adapter |  |
| RS-232 Cable | |
| Remote Cable (25F-25F) | |
| D-Sub footswitch (F760001) | |
Optional Accessories
| PC Link Software | |
| Customized cabinet | |
| Test Fixture |  |
