How exactly does an armature spin in an electric motor?

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SUMMARY

An electric motor operates through the interaction of two magnetic fields: one generated by a permanent magnet and the other by an electromagnet. The armature spins due to the attraction and repulsion of these magnetic fields, with AC motors relying on magnetic attraction and DC motors utilizing a repelling principle. Torque generated by the armature's rotation is transmitted to various components through mechanical systems such as gears, pulleys, and belts. Understanding the relationship between current and torque is crucial, as increased current results in higher torque output.

PREREQUISITES
  • Understanding of AC and DC motor principles
  • Basic knowledge of magnetic fields and their interactions
  • Familiarity with torque and its transmission in mechanical systems
  • Knowledge of electrical current's effect on motor performance
NEXT STEPS
  • Research the principles of AC and DC motors in detail
  • Learn about torque calculations and formulas in electric motors
  • Explore mechanical transmission methods such as gears and pulleys
  • Study the effects of current on torque in electric motors
USEFUL FOR

Engineers, electrical technicians, and students studying motor design and operation will benefit from this discussion, particularly those interested in the mechanics of electric motors and torque transmission systems.

Tabaristiio
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In an electric motor, there exists two magnetic fields where usually one of them is a permanent magnet whilst the other is an electromagnet. However, how does the magnetic fields enable the armature to rotate / spin?

Also, how is the torque from the rotation of the armature transmitted to drive / operate certain components / systems?
 
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Ac motors work on a principle of attraction in magnetic field so North and South attract each other. DC motor work on repelling principle therefore there's a auxiliary field usually which is in series, parallel or both.

For the torque, the way i think about it is that more current is mpre torque. But there are good formulas for this but i don't known them by heart.

Hope this helps a bit
 
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Tabaristiio said:
Also, how is the torque from the rotation of the armature transmitted to drive / operate certain components / systems?

That is not an electrical question. It applies to any rotating shaft. Do you understand how the rotating shaft in an auto engine makes the wheels turn?
 
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Tabaristiio said:
Also, how is the torque from the rotation of the armature transmitted to drive / operate certain components / systems?

Typically using gears & shafts, pulleys & belts, sprockets and chains and combinations of these.
 

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