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Daily maintenance of permanent magnet variable frequency air compressors and PM motors

1. Daily maintenance method of permanent magnet variable frequency screw air compressor

Daily maintenance of permanent magnet variable frequency air compressors and PM motors插图

 01. Maintenance of permanent magnet variable frequency air compressor

(1)Check the oil level, exhaust temperature, and exhaust pressure every day, check whether there is any abnormal sound, and record the data every day;

(2) Before starting the machine every week, open the drain valve of the separator to discharge the condensed water, check whether there is leakage everywhere, and check the safety valve;

(3) Regularly check the intake valve, small pressure valve, solenoid valve, safety valve, and cooling fan;

(4)Regularly clean and clean the cooler and test the reliability of the safety valve;

(5) Regularly replace the oil filter element, oil separator element, air intake filter element, and lubricating oil.

02. Precautions for the operation of permanent magnet variable frequency air compressor

(1) The operation, repair, and maintenance of air compressor accessories shall be carried out by qualified personnel.

(2) The compressor cannot be reversed. After the initial start-up or the overhaul of the electronic control system, before starting the compressor, first, confirm whether the rotation direction of the motor is consistent with the specified direction.

(3)When disassembling the high-temperature components, wait until the temperature has cooled to the ambient temperature before proceeding.

(4) It is recommended to use screw compressor oil, and lubricating oils of different grades are not allowed to be mixed.

(5)Without the permission of the manufacturer, do not make any changes or add any devices that affect the safety and reliability of the compressor.

(6)The original spare parts of the compressor are specially designed and manufactured. Spare parts are recommended to ensure the reliability and safety of the compressor.

(7) It is not allowed to block the suction port of the compressor during operation.

(8)Unless it has been indicated that it can be used for breathing, it is not allowed to use compressed air for breathing.

(9) The compressor cannot be operated under the condition of exceeding the specified pressure and specified temperature.

(10)Once the compressor is found to be working abnormally, the compressor should be stopped immediately and the abnormality should be cleared in time.

(11) Use the correct tools to maintain and repair the compressor.

(12) After the permanent magnet variable frequency air compressor is repaired and before starting up, confirm that the device has been reinstalled and the tools have been removed from the compressor.

2. How to maintain the permanent magnet motor in daily use

01. Remove the sundries, dust, and sludge outside the motor base in time. If there is a lot of dust in the operating environment, it is necessary to clean it every day.

02. Always check the motor terminals and screws for looseness or burns.

03. Regularly measure the insulation resistance of the motor. If the operating environment is relatively humid, it should be measured more often.

04. Regularly clean the bearings with kerosene and replace them with new oil. It is not recommended to fill up the oil when changing the oil. Generally, it can take up 1/2~1/3 of the oil cavity. Otherwise, it is easy to heat up or be thrown out. The oil should be added from one side, and the impurities that have not been cleaned can be squeezed out from the other side.

05. Regularly check the vulnerable parts of the electrical starting equipment to see if the contacts and terminals are burnt, or oxidized and whether the contact is good.

06. Check the insulation condition. The insulating ability of insulating materials varies with the degree of dryness, so it is very important to keep the motor windings dry. The presence of factors such as humidity in the working environment of the motor and corrosive gases in the operation room will damage the insulation of the motor. The common ground fault of the winding is insulation damage, which causes the live part to collide with the metal part that should not be live, such as the casing. The occurrence of such a fault not only affects the normal operation of the motor but also endangers personal safety. Therefore, in the use of the motor, the insulation resistance should be checked frequently, and attention should also be paid to checking whether the grounding of the motor casing is reliable.

07. In addition to the timing protection of the motor according to the above items, the motor and related mechanical equipment must be overhauled in a planned way. Thoroughly and comprehensively inspect and protect the motor, supplement the missing and worn components of the motor, thoroughly remove the dust and dirt on the surface of the motor, check the insulation condition, clean the bearings and check their wear.

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