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When buying an electric motor, the first question on your mind is often the price; yet the real cost is determined by how many years the motor runs trouble-free. A motor bought cheaply whose winding burns out in two years costs far more than a quality motor bought right from the start, because the cost of halted production, emergency procurement and re-installation is many times the initial purchase difference. In this article, as HEM Motor, with our identity as both manufacturer and supplier, we address why an electric motor fails early and the root causes of these failures; but our main goal is to show you how to recognize quality at the moment of purchase. Because most early failures are hidden in a purchasing decision made before the motor even arrives on site. The right three-phase motor or asynchronous motor selection is the first step of a long-lived investment.
How Many Years Does an Electric Motor Last?
A correctly selected, correctly installed and regularly maintained industrial electric motor can run trouble-free for 15 years and beyond, depending on the application. However, this duration is not a guarantee but a potential dependent on conditions. The same motor fails far sooner under overload, in a humid environment or with a low-quality winding. In other words, the motor's lifespan is not a value written on the nameplate; it is the resultant of purchase quality, operating conditions and maintenance discipline. We addressed the effect of periodic maintenance on lifespan in detail in our article on the electric motor maintenance and periodic inspection schedule.
The most critical component determining lifespan is the winding insulation. The insulation class indicates how much temperature the motor can withstand; motors in the HEM Motor range are produced with class F insulation. Class F provides high temperature resistance and, under correct load, offers a long insulation life. You can examine the effect of insulation class on lifespan in our article on winding and insulation class (F/H) in IE3 motors.
The 7 Root Causes of Early Failure
1. Overload and Incorrect Sizing
The most common cause of failure is running the motor with more load than it can handle. Overload raises the current; the rising current heats the winding; with every increase in temperature, the insulation life shortens. Deliberately selecting an undersized motor and saying "it will do" is one of the most expensive mistakes. Correct sizing must be done according to the load torque and duty type. We compiled the common mistakes in motor selection in our article on the 7 most common mistakes when buying an electric motor.
2. Low-Quality or Faulty Winding
The heart of the motor is its winding. Low-quality enamel wire, insufficient turns or faulty rewinding reduce the motor's efficiency and pave the way for early burnout. Motors in the HEM Motor range are produced with 100% copper winding; copper winding provides lower resistance, less heating and longer life than aluminum. We addressed the difference between copper and aluminum windings in our article on the difference between copper and aluminum winding in motors; always question the winding material when buying.
3. Moisture and Low Insulation Resistance
The winding of a motor stored for a long time or operating in a humid environment absorbs moisture; the insulation resistance drops and the winding is damaged upon energization. Therefore, especially in stock motors, measuring the insulation resistance with a megger before commissioning is essential. We explained moisture control in stock and warehouse motors step by step in our article on insulation resistance and megger testing in asynchronous motors.
4. Bearing Failure and Mechanical Strain
The bearing is the most worn mechanical part of the motor. Misalignment, excessive belt tension, vibration or insufficient lubrication wear out the bearing prematurely; bearing noise and vibration are often the first heralds of an approaching failure. The use of quality bearings and correct mounting is the strongest barrier against this failure. You can examine the root causes of noise and vibration in our article on noise and vibration in electric motors.
5. Inadequate Cooling and Blocked Air Channels
The motor dissipates the heat it generates from the body surface and fan cooling. Dust, dirt or an enclosed environment obstructs cooling; accumulated heat fatigues the insulation. In dusty environments, IP55 protection class and regular cleaning ensure cooling continuity. We addressed protection class selection in our article on IP protection class selection in electric motors.
6. Voltage Imbalance and Phase Loss
Voltage imbalance in the grid or the loss of one phase dangerously raises the current in the remaining phases and quickly burns the winding. A phase protection relay, motor protection switch and correct cabling largely eliminate this risk. To protect the winding with temperature monitoring, our article on motor winding temperature monitoring: PT100 and PTC thermistor clarifies which protection option to request when ordering.
7. Incorrect Starting and Frequent Start-Stop
At the moment of starting, the motor draws current far above its rated value. Frequent start-stop or an incorrect starting method imposes the thermal and mechanical strain caused by this high current onto the winding and bearing. Choosing the correct starting method extends lifespan; you can examine the star-delta versus soft starter comparison in our article on starting AC asynchronous motors: star-delta or soft starter.
Reading Failure Symptoms Early
Most early failures are gradual rather than sudden; the motor gives warning signals over days or even weeks. A plant that can read these signals intervenes before the winding completely burns out, protecting both the motor and production continuity. The most common early-warning symptoms are: higher-than-normal body temperature, increasing or changing vibration, a clicking or humming sound from the bearing, a burning smell, frequent tripping of the motor protection switch, and a noticeable drop in speed. Regular inspection catches a small maintenance expense before it turns into a large failure cost.
Correct interpretation of symptoms is often possible with the right measuring instrument. Continuously monitoring winding temperature with a PT100 or PTC thermistor detects sudden heating before the winding is damaged; periodically measuring insulation resistance with a megger catches moisture-related degradation early; and vibration measurement reveals bearing and alignment problems. These three measurements provide a far more realistic picture of a motor's remaining life than the nameplate and make your maintenance plan data-driven.
The Effect of Operating Conditions on Lifespan
Two identical motors of the same quality exhibit very different lifespans under different conditions. As the ambient temperature rises above the reference value the motor is rated for (typically 40 degrees), the insulation life shortens; every 10-degree permanent temperature increase can roughly halve the insulation life. Therefore, for a motor that will operate in hot environments, the insulation class and cooling design must be placed at the center of the purchasing decision. Conditions such as high ambient temperature, altitude, dustiness and humidity must be specified in the order, because these conditions directly affect the power class and protection level to be selected.
The duty type is also a critical factor determining lifespan. A motor with S1 duty type suitable for continuous operation may have a shorter-than-expected life in an application requiring frequent start-stop; conversely, running a motor designed for intermittent duty continuously also causes overheating. Correctly defining the actual operating profile of your application is a precondition for selecting the right motor. Motors in the HEM Motor range are offered as standard in S1 duty type suitable for continuous operation; for special duty profiles, simply share your application with us.
The Signs of Recognizing Quality When Buying
Most early failures can be prevented at the moment of purchase. The concrete signs that distinguish a quality motor are: 100% copper winding; class F (or class H where required) insulation; cast iron body for high mechanical strength; IP55 protection class; S1 duty type suitable for continuous operation; quality bearings; and a clear, complete motor nameplate. These signs indicate how many years a motor will last far more accurately than its price. We explained nameplate reading and which information is essential when ordering in our article on reading the IE3 motor nameplate: kW, speed, cosφ and efficiency.
The efficient electric motors in the HEM Motor range are produced with cast iron body, 100% copper winding, class F insulation and IP55 protection standards; these features make the motor resistant to the seven failure causes above. With high-efficiency IE3 motor and super premium IE4 motor options, we offer the right solution for buyers seeking both energy efficiency and long life.
Rewind or Buy New?
When a motor fails, the classic question facing the buyer is between rewinding and buying new. In small-frame motors, the cost of rewinding and the resulting efficiency loss often make a new motor more sensible; moreover, the efficiency of a rewound motor may drop below the original value. This decision must be evaluated together with the rewind cost, efficiency loss and the advantage of fast delivery from stock. We addressed the topic with figures in our article on rewind or buy new; and when you should replace based on failure symptoms in our article on electric motor failures: symptoms and causes.
You can access our entire product range and corporate information from our home page. Buying the right motor the first time is the most profitable decision for both your budget and your production continuity.
Frequently Asked Questions
How many years does an electric motor last on average?
A correctly sized, correctly installed and regularly maintained industrial motor can run trouble-free for 15 years and beyond, depending on the application. However, this is not a guarantee but a potential dependent on conditions; overload, moisture, low-quality winding and inadequate cooling shorten this duration significantly. The most effective way to extend lifespan is to select a quality motor at the moment of purchase and maintain periodic maintenance discipline.
Why does a cheap motor cost more in the long run?
Cheap motors often use aluminum or insufficient winding, low-quality bearings and a weak body; these motors heat up more, fail sooner and run at lower efficiency, raising the electricity bill. When they fail, the cost of halted production, emergency procurement and re-installation far exceeds the saving obtained at the initial purchase. For this reason, motor purchasing should consider not the initial cost but the total cost of ownership.
How do I recognize quality when buying?
Question the concrete quality signs: winding material (should be 100% copper), insulation class (F or H), body material (cast iron provides high strength), protection class (IP55 and above), duty type (S1 for continuous operation) and a clear motor nameplate. These features indicate how resistant the motor is to early failure causes far more accurately than its price. When in doubt, share the details of your application with us and let us determine the right class together.
Get a Quote
Contact the HEM Motor expert team for our long-lasting electric motors with 100% copper winding, cast iron body and class F insulation. We quote the motor in the right power, speed and efficiency class for your application, together with stock and delivery time information. Call us now at +90 (532) 345 49 86 or request a quote via our contact page.
