Electric motors require lubricants with specific characteristics. Use of the wrong grease often leads to early electric motor failures. The grease consistency preferred for electric motors is normally NLGI 2 or 3, with a base oil viscosity of 100-150 cSt @ 40°C.
Should you grease electric motors?
Rolling-element bearings used in electric motors are at risk for various modes of failure if an incorrect maintenance or lubrication strategy is implemented. … Grease is the lifeblood of these bearings because it provides an oil film that prevents the harsh metal-to-metal contact between the rotating element and races.
Which lubricant is used in electric motors?
A NLGI 2 grade grease is the most commonly used in electric motor applications. ASTM D 3336 oxidation life. require a grease with an EP additive. Dropping Point: The dropping point gives an indication of the temperature at which the grease will melt or the oil will separate from the thickener.
How often do you grease an electric motor?
When the operating temperature is between 80°C – 100°C (176°F – 212°F), oil should be replaced at least every three months. For critical equipment, it is advisable that lubricating oil be analyzed at least every three months to determine when oil replacement is necessary.
How do you grease a motor?
The general procedure for greasing is as follows:
- Lock and tag out the electric motor.
- Wipe grease from the pressure fitting, clean dirt, debris and paint around the grease relief plug. …
- Remove the grease relief plug and insert a brush into the grease relief as possible. …
- Add grease per Table 1.
Is Lithium grease good for electric motors?
The grease consistency preferred for electric motors is normally NLGI 2 or 3, with a base oil viscosity of 100-150 cSt @ 40°C. … A polyurea thickener system is preferred for most electric motor applications, but grease with an aluminum complex, lithium complex or calcium sulfonate thickener are also good options.
What happens if you over grease a bearing?
Too much grease volume (overgreasing) in a bearing cavity will cause the rotating bearing elements to begin churning the grease, pushing it out of the way, resulting in energy loss and rising temperatures.
Can you use wd40 on electric motors?
Yes, it can as WD 40 has oil base which can make winding insulation more weaker and can damage your motor. Also, WD 40 is not recommended to be used over electrical contacts.
Can you oil an electric motor?
Expert advice: When oiling an electric motor, be sure to use oil that’s specifically designed for motors. When oiling an electric motor be sure to use special oil for lubricating electric motors. Other oils could cause excess wear and premature failure.
What happens if you over grease an electric motor?
Over lubrication can cause the grease or oil to get into the windings. This will cause the insulation to deteriorate around the winding, resulting in arcing and shorting inside the motor to the case. Over lubricaiton will also cause excessive heat and wear on the rotor and stator.
What will happen if you do not grease or oil the pump and motor?
Answer: It will have catastrophic failure due to overheating.
Why use polyurea grease in electric motors?
introduced Monolec Extend EM Grease (1282). … The new grease helps bearings run cooler and last longer, increases motor efficiency by decreasing drag, and offers excellent mechanical stability for a long service life – even in high-moisture environments.
How much grease should you put in a bearing?
Typical relubrication amounts are 1/3 to 1/2 of the original fill quantity. The proper fill quantity of a grease lubricated bearing is often specified as a percentage of the bearing’s free space.
What can I use to lubricate bearings?
The oil’s viscosity correlates to the film thickness it can create, which is crucial to the separation of the rolling and sliding parts of a bearing. Grease Lubricant: While some bearing applications use oil as a lubricant, grease is the lubricant of choice for 80 to 90 percent of bearings.
How do you maintain an electric motor?
7 Ways to Ensure Better Maintenance of Electric Motors
- Perform Visual Inspections. …
- Perform a Brush and Commutator Inspection. …
- Conduct a Motor Winding Test. …
- Check the Bearings. …
- Perform Vibration Tests. …
- Use Infrared Thermography in Predictive Maintenance. …
- Document Everything.