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3 problems caused by oversized electric motors

Selecting the right electric motor size to suit your application can be difficult, which is why many end users decide to err on the side of caution and choose a motor that is oversized. The idea is that the motor will comfortably cover the requirements of the driven application, but oversizing can actually have adverse effects. We look at three of these below:

1. Reduced efficiency

Motors are intended to operate at a certain speed and torque point depending on their designed load. An oversized motor run at a lower torque point will operate less efficiently and therefore draw more power than is needed. This means electricity consumption will be greater than if the motor was correctly rated for the application.

2. Poor performance

If a motor is oversized then it may not run close to full load. This increases the risk of overheating which in turn can melt the winding insulation and lead to premature failure.

3. Increased equipment cost

The larger a motor is, the more steel and copper it contains. This is why electric motor cost tends to rise in relation to frame size, so for every size above specification you’re needlessly wasting more money.

So how can you be certain you’re getting the perfect motor for the job? Here at Gibbons we have more than 45 years’ experience supplying electric motors and our friendly team are always available to offer their expertise. We offer a huge selection of ABB electric motors alongside our own wide range, so we have motors to cover almost any industrial application. We’ll ensure your motor is specifically rated for its intended application, helping you to enjoy optimum performance and make significant savings.

So for expert electric motor assistance, call Paul Scott on 01621 868138 or email

Electric Motors


  • Date: 12 July 2018 Scott Chaiet
    need an AC motor to run a fan at 4.2 total inches and 100,000CFM

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