Interpreting FEMM results

[ken_nyus]

Hi All,

I'm trying to simulate a magnet motor using FEMM, and I have some basic questions about interpreting the results.

I think my model is telling me the motor should work, but I could use an experienced eye to validate my thinking.

My first question is:

When asking for torque values, does positive torque represent clockwise twist, and negative torque counter-clockwise twist?

When the result says "about point 0,0", are they talking about the 0,0 absolute point on the surface, or are they talking about a new 0,0 point in the middle of the region/block that is being integrated?

Any help would be appreciated.

[tao]

Hi All,

I'm trying to simulate a magnet motor using FEMM, and I have some basic questions about interpreting the results.

I think my model is telling me the motor should work, but I could use an experienced eye to validate my thinking.

My first question is:

When asking for torque values, does positive torque represent clockwise twist, and negative torque counter-clockwise twist?

When the result says "about point 0,0", are they talking about the 0,0 absolute point on the surface, or are they talking about a new 0,0 point in the middle of the region/block that is being integrated?

Any help would be appreciated.

Yes, the positive and negative torque values equate to the clockwise/counter-clockwise twists.

You must move your simulation on the grid in FEMM such that it is symmetrical about the absolute point 0,0. I do this as I am building each of my FEMM sims, I also build them about point 0,0.

[acp]

No, Positive torque equals anticlockwise movement about 0,0.  Negative torque equals clockwise movement about 0,0

[ken_nyus]

You must move your simulation on the grid in FEMM such that it is symmetrical about the absolute point 0,0. I do this as I am building each of my FEMM sims, I also build them about point 0,0.

Thanks, I guessed that this was true and have started to move the center of rotation for my models to the absolute 0,0 point on the surface.

But this brings up another question:

What does it mean to select a block and then ask for torque? Are we in effect asking "what torque does THIS block exert on 0,0"? Does it make sense to select all the elements of the model, including the air, and then ask for torque? (as long as they all are physically connected somehow)

[ken_nyus]

Yes, the positive and negative torque values equate to the clockwise/counter-clockwise twists.

No, Positive torque equals anticlockwise movement about 0,0.  Negative torque equals clockwise movement about 0,0

Any third opinion?