How to prolong the motor life span

To extend the service life of electric motors, comprehensive management from multiple aspects is required, with a focus on power supply stability, temperature control, lubrication maintenance, environmental protection, and regular inspections. Below are some key methods:

Ensure stable power supply voltage: The motor's power supply voltage should fluctuate within ±5% of the rated value, with a maximum allowable deviation of ±10%. The three-phase voltage difference should not exceed ±5% of the rated value. Excessively high voltage can increase the excitation current, leading to overheating and damage to insulation materials. ‌

 

1.Strengthen temperature monitoring and management: Excessive heat can accelerate insulation aging and lubricant failure. For every 15°C increase in bearing temperature, the lifespan may be halved; for every 10°C rise in ambient temperature, the lifespan of capacitors also reduces by half. Use infrared thermal imaging or smart sensors to monitor temperature in real time, preventing overheating caused by excessive load, poor lubrication, or inadequate ventilation.

 

‌

 

2.Implement the correct lubrication strategy: Regularly inspect the adequacy and quality of bearing grease to prevent under-lubrication or over-lubrication. Poor lubrication increases friction, leading to bearing overheating and wear. Develop a lubrication plan based on manufacturer recommendations and operating conditions.

 

‌

 

3.Maintain motor cleanliness and environmental protection: Regularly remove dust and oil residue from the motor exterior to prevent poor heat dissipation and corrosion. Avoid water ingress, moisture exposure, or prolonged exposure to high temperatures and dusty environments. For electric vehicle motors, ensure waterproofing (e.g., avoid deep water immersion) and dustproofing.

 

‌

4.Establish a Regular Inspection and Maintenance System: By tracking motor operating hours and considering load and environmental factors, develop a preventive maintenance plan. Conduct periodic inspections of wiring screws, bearing conditions, and the tightness of fasteners, promptly addressing any abnormal vibrations or wear.

 

 

How to quickly identify motor abnormalities

Quick troubleshooting of motor abnormalities requires following a systematic process, combining visual inspection and tool measurement, and prioritizing the handling of common fault points. The following methods are based on the general principles of motor detection and are applicable to common scenarios such as motorcycles and industrial equipment.

Safety preparation and preliminary observation

Before operation, be sure to cut off the power and hang the "Do Not Close" sign, and use a voltage tester to confirm that there is no voltage. ‌

Firstly, conduct a visual inspection: observe whether there are burn marks on the motor casing, whether the wiring is loose or damaged, and listen for whether the sound during operation is uniform and there is no abnormal noise.

 

‌

If you smell burnt or smoke, it may be due to a short circuit or overload of the winding, and you need to stop the machine immediately. ‌

 

1.Quick detection of key components

Winding resistance detection: Use a multimeter to measure the winding resistance. Three phase motors need to measure the resistance values between U-V, V-W, and W-U, with an error of ≤ 2%; Single phase motors need to measure the resistance values of the common terminal, running winding, and starting winding, in accordance with the design ratio. ‌

If the resistance value is abnormal (such as a phase being significantly low), it may be a turn to turn short circuit or open circuit.

 

2.Insulation performance test: Measure the insulation resistance between the winding and the casing in a power-off state. The normal value should be ≥ 0.5M Ω (it can be relaxed to 0.1M Ω in humid environments).

 

‌

 

If the insulation value is too low, there may be a risk of moisture or breakdown, and it needs to be dried or replaced.

Mechanical condition assessment: Manually rotate the motor shaft to check if it rotates smoothly. Abnormal resistance or noise may be caused by bearing wear or load jamming. ‌

At the same time, check the bearing temperature. If it exceeds 85 ℃, stop the machine for maintenance. ‌

 

3.Using intuitive methods to assist in diagnosis

The four methods of "seeing, listening, smelling, and touching" can quickly locate faults:

Look: Pay attention to sparks, smoke, or loose wiring. ‌

 

4.Listen: A normal motor should have a uniform "buzzing" sound. If there is a metal friction sound, it may be due to a lack of oil in the bearings. ‌

 

5.Smell: A burnt smell indicates that the winding is overheated or the insulation is damaged. ‌

 

6.Touch: Gently touch the outer shell with the back of your hand (avoid direct contact). If the temperature is abnormally high, it may be due to poor ventilation or overload. ‌

 

7.Targeted scene processing

For electric vehicles or motorcycle motors, it is necessary to focus on checking the appearance of the magnetic motor stator coil and the magnetic attraction of the rotor, and whether the output voltage of the rectifier is normal. ‌

If the power output is unstable, the shaking or jerking phenomenon can be observed through rapid acceleration testing. ‌

Regularly check whether the connecting wires are damaged or oxidized to avoid poor contact. ‌

 

8.Tools and Data Assistance

If conditions permit, use an infrared thermometer to monitor temperature or a vibration analyzer to capture abnormal vibrations. ‌

Establishing a database of health parameters for motors of the same model and comparing historical data can improve diagnostic efficiency