Tech Torqs #8: How Does Stator Temperature Affect Motor Performance?
When a motor runs, it generates heat. And that heat can have a serious impact on performance - especially in slotless permanent magnet motors, where ohmic losses in the stator dominate.
December 2, 2025
In this episode of Tech Torqs, we explain how rising stator temperature increases the resistance of copper windings - by approximately 4% for every 10°C. This means the hotter the stator gets, the more electrical losses the motor experiences.
Higher resistance also increases the voltage drop across the motor, which may limit your ability to deliver torque - especially at lower supply voltages.
In practical terms:
- Hotter stator → higher copper losses
- Higher resistance → reduced torque output
- Unmanaged heat → risk of failure (and burned fingertips)
That’s why thermal design and temperature monitoring are essential for optimizing efficiency and maintaining safe, predictable motor behavior.
If you have a question about motors or motion systems, share it in the comments on our LinkedIn post or send it to us directly - we might feature it in the next Tech Torqs episode.
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