Which of the following is a common sign that a motor may be overheating?

• A. Excessive surface temperature and a distinct odor
• B. Normal operation with no issues
• C. Lower current draw
• D. Faster startup times

Answer: (B)

Overheating shows up as physical signs you can detect on or around the motor, not as a normal, issue-free operation. When a motor runs hotter than intended, the outer surface becomes unusually warm and you may notice a burning-like or chemical odor coming from insulation or winding insulation that’s breaking down. These cues directly point to excessive heat being generated faster than the cooling system can remove it, which is what overheating means.

If a motor were truly overheating, you wouldn’t expect it to just run normally with no issues, and you wouldn’t expect it to start up faster. A lower current draw also wouldn’t align with overheating; when a motor overheats due to overload or insufficient cooling, current behavior is not simply reduced. In short, the telltale signs are heat on the surface and a distinct odor, signaling that insulation or windings are under stress and need attention. If you observe these signs, shut the motor down and investigate potential overload, ventilation problems, or cooling blockages, and inspect bearings and wiring for damage.