Motor Rotor testing system MICROTEST MT-6920 (24/48 Channel)

Price: Contact

Model	MT-6920
Manufacturer	MICROTEST
Power supply	90-132Vac or 198-264Vac
Weight	N/A
Size	N/A
Condition	Stocking
Warranty	12 months

Details description
Specifications
Video
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Motor Rotor testing system MICROTEST MT-6920 (24/48 Channel) combines the Interlayer Short-Circuit Tester (6920), the High Voltage Withstand Tester (7605), and the Multi-Channel Control Box (6908), with the 6920 serving as the main controller.

I. Specification of Engine Rotor testing machine MICROTEST MT-6920 (24/48 Channel

Motor Rotor testing system MICROTEST MT-6920 allows for the configuration of all measurement parameters and provides 24/48 test channels.

The external PC software enables direct real-time access to test results from the 6920, as well as report generation and direct uploading of test results to a database.

MICROTEST MT-6920 offers 24/48 channel testing capability for measuring the welding resistance of motor rotors. It integrates safety compliance, high-voltage insulation, and coil interlayer short-circuit testing into one system.

Motor Rotor testing system MICROTEST MT-6920 (24/48 Channel) supports remote programming and data storage via PC connectivity software and can be equipped with PLC control. Customized test fixtures can be provided for rotor testing according to customer specifications.

24/48 Channels
Hipot/Leakage Current
Insulation Resistance
Winding Layer short Test
Resistance Welding Test
Inductance Test
It can test multiple sets of DUTs simultaneously
4-Wire DC Resistance measurement will be more accurate than others
The Impulse/Surge with waveform comparison is a non-destructive analysis
Storage file up to 100 sets
PC connection data analysis software is available
Chinese/English screen could be switched arbitrarily.

II. Main function of Motor Rotor testing system MICROTEST MT-6920 (24/48 Channel)

Rotor Coil and Rotor Core:

Rotor core is made by 0.5mm silicon steel. Medium and small AC motor’s rotor core are mostly apply on shaft. Huge motor usually apply on steady than stick on the shaft.
Rotor coil is to conduct current and create inductance. There are two type of winding, squirrel-cage and wound.
Squirrel-cage rotor is self-closing winding. There is a conduct bar in each steady and connect both side.
Wound winding rotor is insert insulate wire into core as three phase winding set and connect on slip ring. And lead the current by brush.

Motor-rotor-testing-system-microtest-mt-6920-24-48-channel

Quality Issue on Enameled Process:

The process of covering insulation paint may scratch the wire.
VCrack on wire.

Process of Winding:

Hook/ Out of order/ Envelope
Winding Cross
Tin attached.

Motor-rotor-testing-system-microtest-mt-6920-24-48-channel

Uneven DCR happen in 3-phase motor, this will cause uneven rotate:

MICROTEST MT-6920 4-Wire DC Resistance measurement will be more accurate than others.

Motor-rotor-testing-system-microtest-mt-6920-24-48-channel

Customized test fixture for Rotor coil:

Motor-rotor-testing-system-microtest-mt-6920-24-48-channel

For Enameled Winding of Motor:

Conduct coil’s quality issue.
Layer Short Between Winding
Short on cross winding
Pin Short
Insulation Defect.

Motor Rotor testing system MICROTEST MT-6920 (24/48 Channel) is One-Step-Test FunctionLow Voltage Electrical Test + Hipot Test + Layer Short + Resistance Welding Test.

Motor-rotor-testing-system-microtest-mt-6920-24-48-channel

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.

Motor-rotor-testing-system-microtest-mt-6920-24-48-channel

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.

Motor-rotor-testing-system-microtest-mt-6920-24-48-channel

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 short:

“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.

Inductance of coil
Q rate
Turn ratio of coil(voltage different)
Material of core
Layer short in the coil.

By comparing the wave of damping attenuation between golden sample and DUT:

Provides 5 waveform comparison:

Total area comparison
Differential area comparison
Wave comparison
Flat comparison
Corona comparison.

Motor-rotor-testing-system-microtest-mt-6920-24-48-channel

View More Compact

Technical specifications of Motor Rotor testing system MICROTEST MT-6920 (24/48 Channel)

System	Benchtop	Rack
System

Evaluate whether to include PC connectivity software.
Function	Operate directly on the instrument	PC Link
Production Traceability Management – Implementing Bar Code/Label Printer/Laser Engraver	/	●
Store test file sets	100 sets (existing instruments)	Unlimited (according to PC memory)
Sharing test files between devices	Unable to share, recreate the file	Share through PC software
Accessing test data	/	Transfer test data to the PC via the RS-232 interface
Uploading test data to a cloud database	/	●
User Permission Management” or “User Access Control	/	Supports permission management, configuration through Engineering Mode
CPK Report	/
Customized CPK Report According to Customer Requirements	/

Model	MT-6920
Test Channel	24/48
DC Resistance Test
DCR Range	0.1mΩ-100kΩ
Measuring Mode	4-Wire
DCR Accuracy	Low Resistance 0.1mΩ-1Ω±(0.2%±1mΩ) High Resistance 1Ω-100KΩ±0.1%
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. Show by percentage Analysis the power loss by this data.
Differential area comparison	Add up the difference between normal wave and DUT wave call “ Area differential”. When layer short happened, the inductance reduce(similar the transformer). The wave phase change and the area differential also change. This will show “fail” on the instrument. However, the parameter might cause deviation because of the deviation of inductance, resonance phase shift. (Silicon steel product such as motor and traditional transformer is not suitable) By calculating and comparing the deference of area between golden sample and DUT. To determine the degree of waveform overlap. Compare the inductance by this.
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 – The absolute value of the difference between the two sets of coil inductance – The ratio of the absolute value of the difference between the two sets of coil inductance to the standard value – The ratio of the absolute value of the difference between the inductance of the two sets of coils and the average value of the measured resistance of the three sets of coils

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
Power Supply	Frequency	50/60Hz
Power consumption	300VA
Environment	Temperature	10℃-40℃
Environment	Humidity	20-90%RH
Display	6920	5.7″ dot-matrix display (320*240)
Display	7605	4.3″ TFT LCD (480*272)
*Dimension (WHD)*	6920	435x190x522mm
	7605	435x145x522mm
	6908	435x145x522mm
Weight	6920	15 Kg
	7605	14 Kg
	6908	3 Kg
Interface	RS-232