(1) The matching relationship between the performance of lubricating grease and the operating conditions of the motor. In the technical conditions of the motor, the standard operating environment of the motor will be specified, such as ambient temperature, altitude, etc. When selecting lubricating grease for standard motors, these conditions will be followed. However, for motors operating in special environments, the operating environment may be harsh, such as high temperature environments, low temperature environments, etc.

For particularly cold climates, lubricating grease must have sufficient low-temperature resistance. Personally, I have experienced a batch of motors where, after the motor was taken out of the warehouse on a cold day, the manual motor could not rotate and made obvious noise when powered on. The motor sound was normal after running for about 5 minutes. After verification, the lubricating grease used in the motor does not meet the requirements. Similarly, for motors operating in high-temperature environments, such as air compressor motors, especially in the warmer southern regions, most air compressor motors operate in environments with temperatures above 40 degrees Celsius. Coupled with the temperature rise of the motor, the bearing system temperature will be very high, and ordinary lubricating grease will degrade and fail due to excessive temperature, resulting in the loss of bearing grease. The bearings are in a non lubricated state, and in a short period of time, the bearings will heat up and be damaged. In severe cases, the windings may burn out due to high current and temperature.

(2) Excessive lubricating grease causes bearing heating. From the perspective of heat conduction, bearings also generate heat during operation, which is dissipated through related components. When there is too much lubricating grease, it accumulates in the bearing system cavity, which is extremely unfavorable for heat dissipation. Especially for bearing systems with larger inner cavities, this problem is more severe. We once conducted a test using an infrared instrument to measure the temperature of the bearing system. We checked the points with relatively high temperatures and found that there was a lot of grease accumulation in the outer cover of the bearing. After removing it, the temperature naturally decreased.

This involves two issues, one is the filling amount of lubricating grease, and the other is a very important issue in the design of bearing related components, mainly involving the oil baffle and bearing inner and outer covers.

(3) The rationality of the design of bearing system components. Many motor manufacturers have made improvements to the design of bearing system components. In addition to the fitting tolerances we discussed in the previous issue, improvements have been made to the bearing inner cover, bearing outer cover, and oil baffle to ensure the circulation of an appropriate amount of grease during bearing operation, meet the necessary lubrication requirements, and prevent heat resistance problems caused by excessive grease filling.

(4) Regular replacement of lubricating grease. When the motor is running, the lubricating grease should be replaced according to the frequency of use. During the replacement process, the original grease should be cleaned and replaced with the same brand of grease; For this issue, normal manufacturers will indicate the replacement cycle and specific brand of lubricating grease.

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