How does this kind of DC motor work?

AI Thread Summary
The discussion revolves around understanding the operation of a specific type of DC motor, particularly focusing on the source of the magnetic field. It is noted that the arms adjacent to the coils are not magnetized, raising questions about how the magnetic field is generated. The participant seeks clarification on the role of the coil at the bottom of the motor in producing this magnetic field. Additionally, there is an inquiry about the feasibility of calculating the magnetic field without specialized equipment. Overall, the conversation emphasizes the fundamental principles of DC motor functionality and magnetic field generation.
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Homework Statement


I used a similar motor to this one in a prac, and then realized that the arms either side of the coils were not magnetised. I was wondering where the magnetic field comes from, and without any special equipment is it possible to calculate it?


Homework Equations


t=bain
 
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Isn't the purpose of the coil at the bottom of the motor to produce a magnetic field?
 

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