Well-manufactured and regularly maintained electric motors can generally run trouble-free for 15–20 years or even longer. Motor life is determined by the insulation class, bearing quality, operating temperature, load conditions and maintenance routine. In practice, two separate lifetimes matter: that of the winding insulation and that of the bearings.

Insulation life and temperature

Winding insulation ages over time under the effect of heat. Class F insulation is rated for up to 155 °C; when a motor runs well below that limit, for example with a class B temperature rise, the insulation keeps a substantial safety margin. As a rule of thumb, every sustained 10 °C increase in operating temperature roughly halves insulation life. Overloading, voltage imbalance, blocked cooling and frequent starts therefore shorten life directly. Moisture, chemical vapours and voltage spikes from inverters also stress the insulation.

Bearing life

Bearings are the parts that wear most mechanically, and many motor failures originate there. The main factors that determine bearing life are:

  • Lubrication with the right type, quantity and interval
  • Coupling and pulley alignment, and belt tension
  • Vibration level and a solid foundation
  • Seals and IP protection that keep dust and water out of the bearing

With good maintenance, bearings are replaced on schedule and the rest of the motor keeps working for many years.

How to extend service life

The most effective steps are choosing a motor rated for the application, ensuring adequate ventilation, using a correctly set protection relay and PTC thermistors, and measuring vibration and insulation periodically. DRG Motor's motors, with class F insulation, quality bearings and high efficiency, are designed for long service life.

For help choosing a long-lasting motor, contact us on +90 (542) 666 11 11 (WhatsApp) or at info@drgmotor.com.