Common Causes of Motor Downtime and How to Prevent Them
Industrial motor failure is a common issue in manufacturing and industrial operations where electric motors stop functioning properly due to electrical, mechanical, or operational faults.
If motor downtime is ignored, it can lead to many problems such as production stoppages, expensive repairs, shutdowns, and disappointed customers which can result in losing customers because if they don’t receive on time, they will go to competitors. It can also increase operational costs significantly and reduce the overall lifespan of industrial equipment. Therefore it’s important for industrial operators to understand the common causes of motor downtime and take proactive steps to prevent them.
In this article, we will explore the most common reasons behind industrial motor downtime and we will also look at practical ways to prevent these issues before they lead to serious breakdowns.
Common Causes of Motor Downtime and How to Prevent Them
A motor failure isn’t just an inconvenience as it can bring entire operations to a halt which can lead to costly downtime, expensive emergency repairs and potential product loss. That’s why it is crucial for industrial technicians to know how to identify problem issues early and implement solutions as soon as possible.
Below are some common causes of motor downtime and practical ways to prevent them.
1. Contamination:
Contamination is one of the most common causes of motor downtime in industrial environments. Contaminants, in the form of dirt, dust, moisture, oil, and chemical particles can enter a motor’s internal components which can cause corrosion and wear over time like dirt can block the cooling vents that prevent overheating and allow motor temperatures to rise. While, water can lead to rust on metal surfaces and damage bearings. Over time, this can lead to overheating, electrical faults, and ultimately unexpected motor failure.
Therefore, It’s essential to protect your electric motors from dirt and other contaminants. It’s important to implement safe work practices like regularly clean your fixtures, tools and work areas to prevent dirt and particle buildup. Positioning the motor away from machines that might introduce air contamination can also be good. According to ABB, unplanned motor failures can cost industrial facilities an average of $125,000 per hour in downtime, making contamination prevention a cost-effective investment.
2. Lubrication Problems:
Both over lubrication and under lubrication can cause motor downtime. Over lubrication can lead to overheating and causes grease that increases operating temperature and places unnecessary pressure on bearing seals that leads to more consumption of energy than necessary and shortens the motor’s lifespan. While, under lubrication can cause excessive friction between moving parts which results in premature bearing failure.
That’s why it’s essential to understand how much lubrication your electric motors require. It’s important to follow the motor manufacturer’s recommended grease quantity as over greasing can be just as harmful as under greasing so avoid over-greasing by applying only the recommended amount. Moreover, use the correct lubricant type and viscosity for the operating conditions to ensure optimal performance and longevity of the motor.
3. Frequent Start-Stop Cycles:
Industrial motors are designed to operate continuously or within a specified number of starts per hour. If these industrial motors are started and stopped frequently, it can cause electrical faults or motor burnout. This often happens when power supply fluctuations occur, causing voltage drops due to heavy loads or the use of different machines, which then stops the motors. According to Siemens, an electric motor can draw 5–8 times its rated current during startup, creating significant thermal and mechanical stress if starts are too frequent.
To prevent this, you’ll need to be very mindful of setting a specific time for the motor to start and stop, and avoid the risk of starting it repeatedly. Maintaining a stable voltage supply and using proper protection systems like voltage stabilizers and surge protectors is also essential to prevent motor damage and ensure smooth operation.
4. High Humidity and Moisture Exposure:
High humidity and moisture exposure can be really tough on industrial motors. When moisture gets into a motor, it can cause a bunch of problems. For starters, it can lead to corrosion on the metal parts, which weakens them over time and can eventually cause failures. It also messes with the insulation on the windings. If that insulation breaks down, it can cause short circuits, leading to electrical faults and potentially burning out the motor. In humid environments, condensation can form inside the motor, especially during temperature changes, which is never good.
To prevent issues from high humidity and moisture, it’s important to ensure motors are properly enclosed with adequate sealing. Use internal heaters to keep temperatures above the dew point and prevent condensation, and maintain good ventilation. Also, regularly test the motor’s insulation resistance to detect moisture related problems early.
5. Shaft Misalignment Issues:
Misalignment occurs when the motor drive shaft is not in correct alignment with the load. Even a small misalignment can create excessive stress on the motor and connected equipment which causes bearings, couplings, and seals to wear out much faster than normal. Another consequence of misalignment is increased vibration in the load and motor.
Preventing shaft misalignment starts with proper installation and regular maintenance. During installation, technicians should use laser shaft alignment tools or dial indicators to ensure the motor shaft and the driven equipment shaft are perfectly aligned. Besides this, if you get any warning signs like unusual sounds or vibrations, don’t ignore them but instead check them immediately before the motor gets damaged.
6. Soft foot:
Soft foot conditions happen when the mounting feet of a motor or driving component are not even or seated on the same surface. Due to this, an action like tightening the mounting bolts can create new misalignment mechanical stresses which leads to vibration, shaft misalignment, bearing wear, and premature motor failure.
Preventing soft foot starts with proper motor installation. Before tightening the mounting bolts, make sure the motor is placed on a clean, flat, and stable foundation. Check that all four motor feet are in full contact with the base. If there is a gap under any foot, use the correct thickness of shims to level the motor instead of forcing it into place by tightening the bolts.
7. Aging and Natural Wear of Motor Components:
Industrial machines and motors run continuously for many hours in industries without breaks and they handle heavy loads because so much work in industries depends on them. Not only this, but motors also endure many other things like high voltage, power supply fluctuations, high temperatures, and harsh working conditions which gradually lead to some problem in the motor. And if motors are not maintained, not properly checked, or seals are not in place, they will keep developing faults. Even if you repair it once, the motor will continue to break down over time.
Therefore, if you want to use motors for a long time, it is very important to take care of them. For example, don’t place them where dirt can accumulate, ensure there are no power supply fluctuations, and if there are any warning signs like vibration or noise, don’t ignore them but check and get them fixed immediately before the motor develops more faults. If any parts have become very old, replace them promptly to increase its lifespan and maintain good performance.
Conclusion:
Motors are expensive to repair and if motors fail it could be a huge loss. Therefore, understanding the causes of motor downtime and how we can prevent it is very important as many failures occur not because the motor was faulty, but because early warning signs were missed so identifying these issues early not only extends motor life but also reduces repair expenses and keeps operations running smoothly.
If you’re looking to understand the root causes behind these breakdowns, read our guide on “Why Do Industrial Motors Fail Frequently?”