Example of Circuit_collector_2D, Why it creates 24 coils?

Christian Rivera

Hello, I am following the DC motor example in flux to understand how to create the circuit with a commutator and brushes. In the example, we have a lap winding with 12 slots (2-layer winding) and four poles. The macro results in 24 coils all coil regions have a positive orientation of the current each coil is apparently the positive and the negative polarity going to each segment, and because I see each coil has half the resistance value, I assumed the two coils try to model one real coil. I do not know why it does not use only one coil instead of two with the positive and negative orientation of the current. I want to understand the circuit in order to create new ones. I saw all the help and it was not helpful. Please advise.

 

Mohammed Elamin_22169

Hello, 

IMO, That is just how the macro "Circuit_Collector" used to build this circuit works (not sure if you ware of this macro). Lumping the two coil conductors into one should be same, you would need change the orientation of the "negative regions" to negative and have the full coil resistance assigned to the conductor (as you mentioned). 

I am not sure if you aware of this macro, but I would recommend you to use it to build the circuit, if possible. as it is easy t make a mistake for such circuit if you build it manually. 

Thanks,     

Christian Rivera

Mohammed Elamin_22169 said:

Hello, 

IMO, That is just how the macro "Circuit_Collector" used to build this circuit works (not sure if you ware of this macro). Lumping the two coil conductors into one should be same, you would need change the orientation of the "negative regions" to negative and have the full coil resistance assigned to the conductor (as you mentioned). 

I am not sure if you aware of this macro, but I would recommend you to use it to build the circuit, if possible. as it is easy t make a mistake for such circuit if you build it manually. 

Thanks,     

Thank you, I appreciate your response. Could it be possible that the macro goes this way because of how the commutator is modeled in the software? Let me explain myself. I mean, because the commutator is defined in angles, the positive orientation of a coil is then negative depending on the position. So that is why two coils are created and always positive oriented and put back to back to achieve this. Only my first guess on why it is modeled this way. I would like to confirm it, though.

Mohammed Elamin_22169

Christian Rivera said:

Thank you, I appreciate your response. Could it be possible that the macro goes this way because of how the commutator is modeled in the software? Let me explain myself. I mean, because the commutator is defined in angles, the positive orientation of a coil is then negative depending on the position. So that is why two coils are created and always positive oriented and put back to back to achieve this. Only my first guess on why it is modeled this way. I would like to confirm it, though.

Hi Christian, 

No, I don't think this is the reason. It is just historically it is done this way. But if you want you can lump the two coils in the circuit into one and just reverse the orientation on the region and you will have the same result. 

Thanks,    

Christian Rivera

Mohammed Elamin_22169 said:

Hi Christian, 

No, I don't think this is the reason. It is just historically it is done this way. But if you want you can lump the two coils in the circuit into one and just reverse the orientation on the region and you will have the same result. 

Thanks,    

You are right. I confirmed is the same. Thank you.