Running DC motor at higher than rated speeds

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SUMMARY

The discussion centers on the operation of a separately excited DC motor, rated at 1500 RPM, achieving speeds exceeding 2500 RPM during a power electronics lab experiment. This phenomenon occurs due to the relationship between the average voltage supplied to the motor and its load conditions. When the voltage is increased or the load is reduced, the motor can exceed its rated speed, as the speed is directly influenced by these factors.

PREREQUISITES
  • Understanding of DC motor operation principles
  • Knowledge of thyristor control in power electronics
  • Familiarity with voltage and load relationships in electrical systems
  • Basic concepts of motor speed specifications
NEXT STEPS
  • Research the effects of voltage on DC motor speed control
  • Learn about thyristor applications in motor control systems
  • Explore load impact on motor performance and efficiency
  • Investigate the implications of operating motors beyond rated specifications
USEFUL FOR

Electrical engineers, power electronics students, and anyone involved in motor control applications will benefit from this discussion.

zaman999
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Hi,
I had this power electronics lab experiment where we control the speed of a separately excited dc motor using thyristors. The dc motor is rated at 1500 RPM but we do get readings where the speed is above 2500 RPM. How is that possible?

Thanks
 
Engineering news on Phys.org
Without a load a DC motor will run at a speed determined by the average voltage provided. The motor speed specification also specified voltage and load. You have changed the voltage or load from those specified for that RPM.
 

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