Difference between induced emf and counter emf

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SUMMARY

The discussion clarifies the distinction between induced electromotive force (emf) and counter electromotive force (back emf). Induced emf occurs when a motor is driven, acting as a generator, while counter emf is specifically generated when the motor is running, opposing the applied voltage. When a motor is unloaded and driven, it generates emf, but when stalled, it does not produce back emf, resulting in maximum current draw.

PREREQUISITES
  • Understanding of electromotive force (emf)
  • Basic principles of electric motors
  • Knowledge of motor operation under load and no-load conditions
  • Familiarity with concepts of current and voltage in electrical circuits
NEXT STEPS
  • Research the principles of electromagnetic induction
  • Study the operation of DC motors and their characteristics
  • Learn about the effects of load on motor performance
  • Explore the role of back emf in motor control systems
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Electrical engineers, students studying electromagnetism, and professionals involved in motor design and control systems will benefit from this discussion.

aruwin
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What is the difference between induced electromotive force and counter electromotive force? The way they are generated seems the same to me. Can someone tell me the difference and how they are different?
 
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Same thing. Counter-emf is generated when a motor is running & acting like a generator in consequence. An unloaded motor, when driven, similarly acts like a generator, generating emf. The back emf cancels the applied emf and no current Is drawn.

A motor, when stalled, does not generate any back emf, thus uses max. current.
 

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