How does a DC motor work without a commutator?

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SUMMARY

The discussion centers on the operation of a DC motor without a traditional commutator. Participants clarify that while the motor may appear to function without a commutator, it actually employs a mechanism that mimics commutation, allowing the rotor to continue spinning. The initial force applied to the rotor is crucial, as it provides the necessary momentum to overcome magnetic attraction and maintain motion. Users emphasize the importance of understanding the underlying principles of magnetic forces in motor operation.

PREREQUISITES
  • Basic understanding of DC motor principles
  • Knowledge of magnetic forces and their effects on motion
  • Familiarity with rotor dynamics and momentum
  • Experience with practical motor assembly and testing
NEXT STEPS
  • Research the principles of magnetic fields in DC motors
  • Explore alternative motor designs, such as brushless DC motors
  • Study the role of momentum in mechanical systems
  • Examine videos and practical demonstrations of commutator-less motors
USEFUL FOR

Electronics enthusiasts, engineering students, and hobbyists interested in motor design and functionality.

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How can this DC motor work without a commutator. Should it not turn no more than once and then stop because on one side the rotor is attracted to the magnet?

An answer I can think of is that the rotor is repelled on one side and attracted on the other by the same force which neutralize each other so what counts is the force you give it in the beginning when you spin it with your hand. Or is it the momentum that gets it over the being attracted part of the circle? What do you think?

It works very well. There are many videos and I tried it myself.
simple%20motor.jpg
 
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That motor does have a commutator of sorts. I'm guessing when you tried it, it didn't work.

If you had actually built this, and it worked, you'd know how the commutators function is accomplished.
 
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