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Motor Lubrication Guide

Proper lubrication is crucial for electric motor reliability and longevity. Lubricants reduce friction, prevent wear, and provide cooling and corrosion protection. Selecting the right lubricant and applying it correctly ensures optimal motor performance and extends its service life.

Electric motors are indispensable and important equipment in various industries, but one of the main problems plaguing the operation of electric motors is the wear and tear of the motors. Proper lubrication is essential for reliable motor operation and to achieve a long service life, as lubricants reduce friction in the bearings and minimize wear on the components. However, lubrication is not always beneficial, and incorrect lubrication practices can lead to premature motor failure. This guide covers the key factors when selecting, using, and maintaining motor lubricants.

The need for lubricants

Inside a motor, there are multiple metal parts in relative motion. Without lubrication, severe friction occurs between these metal parts due to direct contact. High friction causes rapid wear on the surfaces of the parts inside the bearing, which can seriously shorten the life of the motor. Adding lubricant can form a lubricant film between moving parts, greatly reducing friction and effectively preventing wear. At the same time, the lubricant can take away part of the heat generated in the process of movement, play a certain cooling effect, and prevent the bearing from overheating. The lubricant itself also has an anti-corrosion effect and can prevent bearing internal corrosion.

Lubricant selection

Choose a lubricant designed for motor applications. Mineral oils, synthetic oils, and greases are common. Different lubricants have different viscosities and loads, speeds and temperature ranges need to be considered when selecting a viscosity. Different lubricants should not be mixed, as mixing can cause the grease to harden or clump.


When lubricating the motor for the first time, apply grease slowly and evenly. Applying too much lubricant to the motor tends to cause it to overheat.

Using a lubricant that has been contaminated with other substances may increase wear, so it is best to use gloves when applying lubricant. Keep parts clean before and after applying lubricant. If, while applying the lubricant, you notice that it becomes cloudy, thick, or has a strange odor, it is best to replace it with a new one.


Motor life and reliability can be maximized with lubricants designed specifically for motor applications. With proper lubrication efforts, motors can operate more reliably.

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