Knowledge related to motor bearings

Motor bearings are specialized bearings used in electric motors. There are many types of motor bearings, such as sliding bearings, joint bearings, rolling bearings, oil containing shafts, etc. Among them, the most common is rolling bearings, which mainly support the rotation of the shaft and bear the components that are idling on the shaft. In electric motors, bearings are also used to connect motor components together, allowing for the transfer of any force and motion, and are important accessories for the rotating parts of the motor.

During the operation of a micro motor, temperature control is crucial. The maximum temperature of the rolling bearings should not exceed 95%, and the temperature rise of the bearings should not exceed 55 ℃. This is calculated based on the ambient temperature when testing the bearing temperature.

The temperature of motor bearings can be affected by various factors, such as heat dissipation conditions, ambient temperature, and load conditions. If the temperature of the motor bearings is maintained below the rated temperature under normal working load, and exceeds the rated temperature (around 55 ℃), timely maintenance and repair should be carried out to avoid damage to the motor bearings. If not handled in a timely manner, the motor is often the most damaged, which will shorten its service life and affect normal operation and production.

If the quality of the lubricating grease is poor or has deteriorated, and dust and impurities are mixed in, it may cause the bearing to heat up. The amount of lubricating oil must be adjusted to about 1/2-2/3 of the volume of the bearing chamber space. The unsuitable or deteriorated lubricating grease should be cleaned and replaced with clean lubricating grease. It should be noted that adding too much or too little lubricating grease can also cause the bearing to heat up. When the lubricating grease is added too little, dry friction may occur, leading to heating. When there is too much lubricating grease, there is a lot of friction between the rotating part of the bearing and the lubricating grease.

For the heating of precision motor bearings, we can first consider burying temperature measuring elements near the bearings, and then protecting the bearings through control circuits. Generally, electric motors have temperature measuring elements (such as thermistors) inside the motor, and then two wires are connected to a dedicated protector from inside. The protector sends a constant 24V voltage, and when the gear motor bearing overheats and exceeds the set value of the protector, it will trip to provide protection. Secondly, while selecting the appropriate lubricating oil or grease correctly, a timed and quantitative lubrication method should be adopted to ensure sufficient lubrication of the bearings, reduce bearing wear and temperature; Optimizing the bearing structure and improving ventilation conditions can also reduce the temperature of the bearing. For example, improving the ventilation conditions of the bearing by machining holes and heat sinks, installing insulation covers, fans, and other items to avoid external heat sources interfering with the bearing, and increasing the working environment temperature of the bearing.

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