FAT Test Report of Electric Motors

Parameters, Testing Methods, and Their Significance

1. D.C. Resistance of Winding at (22°C) (Ω) Parameters: Ruv, Ruw, Rvw Tested Value: Ruv (0.00967 Ω), Ruw (0.00979 Ω), Rvw (0.00982 Ω) Testing Method: Using an ohmmeter or multimeter to measure the resistance between each pair of phases in the motor windings. Significance: This indicates the condition of the motor windings. Low or imbalanced resistance values can indicate short circuits or faults in the windings.
2. Insulation Resistance (MΩ) Tested Value: 500 MΩ Testing Method: Insulation resistance is measured using a megohmmeter (megger). This test is performed by applying a high DC voltage (typically 500V to 1000V) and measuring the resistance between the motor windings and the motor casing (ground). Significance: High insulation resistance indicates good insulation quality, preventing leakage currents and ensuring safety. Lower values can signify insulation degradation, moisture, or contamination.
3. Locked-Rotor Current (A) Tested Value: 491.97 A Testing Method: The motor is started with its rotor locked (held stationary), and the starting current is measured using an ammeter or power analyzer. Significance: Locked-rotor current is the maximum current drawn when the motor is powered on but not allowed to rotate. It’s critical for sizing motor protection and understanding motor behavior during startup.
4. Locked-Rotor Power (W) Tested Value: 31,034.3 W Testing Method: Measured while the motor is in a locked-rotor condition, using a power meter to calculate the power drawn during the test. Significance: Locked-rotor power indicates the energy consumed by the motor during startup under full load, affecting efficiency and performance during startup.
5. No Load Current (A) Tested Value: 91.04 A Testing Method: The current drawn by the motor when running at its rated voltage without any load is measured using an ammeter. Significance: No-load current shows the motor's efficiency when running without a load. Higher no-load current can indicate issues like mechanical friction or electrical losses.
6. No Load Power (W) Tested Value: 3863.8 W Testing Method: The power consumed by the motor when running without any load is measured using a power meter. Significance: No-load power provides an insight into the inherent losses of the motor, such as friction, windage, and core losses.
7. Vibration (mm/s) Tested Value: 1.3 mm/s Testing Method: Vibration analysis is performed using a vibration meter or accelerometer, typically measuring vibrations in mm/s. Significance: Low vibration levels are essential for the longevity and health of the motor. Excessive vibration can indicate mechanical imbalance, misalignment, or bearing issues.
8. Noise of No Load (dB) Tested Value: 83.4 dB Testing Method: Noise levels are measured using a sound level meter placed near the motor. Significance: Noise can be a sign of mechanical wear, improper alignment, or issues in the bearings. Acceptable noise levels ensure that the motor operates within industry standards for noise pollution.
9. Bearing Temperature (°C) Tested Value: 39.6°C Testing Method: A temperature sensor, such as a thermocouple or infrared thermometer, is used to measure the bearing temperature during motor operation. Significance: Bearings should operate within specified temperature limits to prevent damage. Excessively high temperatures indicate lubrication problems or bearing wear.
10. Voltage Withstand Test (V/S) Tested Value: 1800/60 Testing Method: A high voltage (usually AC) is applied between the motor windings and the frame for 60 seconds, testing the motor's insulation strength. Significance: This test ensures the motor’s insulation can handle the high operating voltages without breakdown. Failure in this test can lead to electrical failures during operation.
11. Direction of Rotation Tested Value: 双旋向 (Double direction) Testing Method: The motor is powered on and visually inspected to confirm the rotation direction. Significance: Correct motor rotation direction is essential for the application. Some motors are designed to rotate in both directions, while others are designed for a specific direction.

Conclusion:

The motor in this FAT report has passed all tests and is deemed Qualified in each parameter. Each of these parameters ensures that the motor is mechanically and electrically sound, and that it will perform efficiently under the specified conditions without faults.

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