Basic question on right hand slap rule and electric motor

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SUMMARY

The discussion centers on the necessity of current reversal in electric motors to achieve constant rotational motion. It is established that without this reversal, the motor would oscillate back and forth, rendering it ineffective for practical applications such as driving turbines or wheels. The right-hand slap rule is also clarified, emphasizing that the magnetic field experienced by the current is used in this rule, rather than the magnetic field calculated through the right-hand grip rule.

PREREQUISITES
  • Understanding of electric motor operation and current reversal
  • Familiarity with magnetic fields and their interaction with electric currents
  • Knowledge of the right-hand slap rule and right-hand grip rule
  • Basic principles of linear motion and mechanical output from electric motors
NEXT STEPS
  • Study the principles of electric motor design and operation
  • Explore the applications of electric motors in various mechanical systems
  • Learn about the right-hand rule in electromagnetic theory
  • Investigate the impact of magnetic flux changes on motor performance
USEFUL FOR

Students in electrical engineering, hobbyists interested in electric motor applications, and educators teaching concepts of electromagnetism and motor functionality.

sameeralord
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Hello guys,

First of all I have small question with the electric motor. I just learned today in class that with electric motor loops the current is reversed in the loop after 180 degrees to continue a constant movement in one direction. But my question is why is this nessecary. If we don't have this the loop would spin back and forth. Isn't this a change in magnetic flux. So why do we have to have constant one direction rotation. Other quetsion is simply about right hand slap rule. We use the magnitic field experienced by the current in this rule don't we. I mean let's say they gave us the current. We don't then have to work out the magnetic field by the right hand grip rule and then use right hand palm rule. I'm assuming this magnetic field we work out from right hand rule is not experience by the current so we don't use that in the rule. We use the magnetic field it experiences. For example when it is inside a magnet. I hope you understood what I was saying. Anyhelp as always would be much appreciated:smile:
 
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producing linear motion

sameeralord said:
Hello guys,

First of all I have small question with the electric motor. I just learned today in class that with electric motor loops the current is reversed in the loop after 180 degrees to continue a constant movement in one direction. But my question is why is this nessecary. If we don't have this the loop would spin back and forth. Isn't this a change in magnetic flux. So why do we have to have constant one direction rotation.

Hi sameeralord! :smile:

Yes, I suppose the motor would work ok without the reversal …

but it wouldn't have a useful output.

If the motor turns the same way all the time, you can join it to a turbine or a wheel, and produce linear motion. :smile:

If the motor keeps reversing direction, all it can be used for is rocking cradles etcetera. :frown:
 


tiny-tim said:
Hi sameeralord! :smile:

Yes, I suppose the motor would work ok without the reversal …

but it wouldn't have a useful output.

If the motor turns the same way all the time, you can join it to a turbine or a wheel, and produce linear motion. :smile:

If the motor keeps reversing direction, all it can be used for is rocking cradles etcetera. :frown:

So it is for practical purposes. Thanks a lot for your help :smile:.

If the motor keeps reversing direction, all it can be used for is rocking cradles etcetera.

lol good one:smile:
 

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