Vacuum pump motor maintenance and troubleshooting

Asynchronous motor pump vacuum pump in operation, often due to many reasons, a variety of failures, affecting production. To this end, the proper use and maintenance of motor operation, motor failure to understand the main phenomenon, limiting the expansion of the failure to promptly be excluded, to ensure completion or ahead of schedule to complete the production task is very important. Vacuum pump motor maintenance and troubleshooting 1, before the start of the new or long-running motor preparation, before starting, even if the windings on the stand and three-phase winding insulation resistance between the display is still dry. Because the measured insulation resistance does not indicate the inter-turn condition of the windings, the interior may still have moisture even when the coil has a high insulation resistance between ground and its phases. Damage to the insulation can often occur if the motor is energized without being dried. The newly installed motor should pay attention to check the following before starting the motor: the engine room should be cleared of dust. Check the condition of the filter and cooler unit (if not otherwise). Carefully inspect the accessible interior of the motor, check for internal debris in the motor, and purge the interior with dry, compressed air (up to 200 kPa). If there is no compressed air, you can use the hand bellows. To prevent damage to the coil insulation, do not use metal nozzles. Motor needs to be dried. Check if the line voltage and frequency match the voltage values ​​and frequency values ​​shown on the motor nameplate (1% of the voltage and ± 1% of the frequency); Check that all the outlets of the motor are correctly wired according to the corresponding wiring on. In the voltage of 220 / 380V dual-purpose motor, be sure to check the outlet box outlet end of the connecting piece position is correct. For 380V should be Y connection, 220V should be △ connection, the correct connection piece. Check the contact bolts and feet and bearing bolts nuts are tightened, and the mechanical aspects of the firm. If the motor is disassembled prior to installation, use a gauge to check that the air gap between the stator and the rotor is uniform. Air gap deviation should not exceed 10% of the average single-sided air gap. When checking plain bearings, clean the bearings with kerosene and the bearings wash until the oil is clear in the oil. Lubricating the lubricating oil on the sliding shaft with oil ring should be injected into the bearing with the lubricating oil of turbine oil (for high-speed motor) or mechanical oil (for low-speed motor), and the specified oil level should be reached. Ball bearings and roller bearings using grease on the 3rd lithium grease, two-motor lithium special grease (1 and 3% lithium base grease molybdenum disulfide). Check the bearing assembly is good, both ends of the motor shaft rotation, the rotor is free rotation, the sound is normal, the use of sliding bearings, the rotor axial flow on each side of about 2-3mm range. Check the brush on the collector ring and brush lift operating mechanism. Brush face pressure is about 15 ~ 20kPa. Check the collector ring on the brush between the conductive lines. Check all the brush all the surface and the collector ring close to check the protection and signal instrumentation (signal oil and thermocouple, etc.). Check the grounding of the motor housing and lead sheath of the cable housing. Check the insulation resistance of the motor with a mega meter, the measured value shall not be less than the value obtained by the following formula.

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