Learning Forum

[210223006]

Hi,

I designed a Maxwell double symbols asynchronous motor, I get force data from the rotor, but the motor does not go into saturation even if I increase the current a lot. It shows the force value. I will indicate this graphically in the attachment. Am I missing a point? Can you help?

The orange line also needs to stay saturation.

 

[Ivonne Marti]

Hi,

If the machine is long and thin, the 3D effects could have a considerable impact in the force calculation. It is also important to check that the material properties and speed are correct and match with the Test.

I hope this helps

[210223006]

First of all, thank you for your answer. It is 660 mm long and 37.5 mm thick. I also verified the thickness setting from the design settings. I chose JFE_Stell_50JN350 as the core material. When I check the BH curve, it is correct. I define a speed for the rotor and examine the force value while moving at a speed of 1.8 m/s.

 

My expectation is that the graph will saturate when the motor is at the appropriate Tesla values, but this is not happening right now.

[GLUO]

Hi,

Are you expecting there should be a force drop due to the saturation when current>6 A?

GL

[210223006]

First of all, thank you for your answer. Yes, I think so, because the BH curve of magnetic material is nonlinear. When the Tesla value increases to a certain value, it should saturate. Am I missing a point?

[GLUO]

I would recommend checking the BH curve for your core material first. We can read above what B value is this material saturated. Then we can check the FEA B field plots for above 6 A cases, and check if the area higher than this B value is increasing. 

[210223006]

I checked the bh curve of the material, it is correct, I will add it in the attachment. Even if I define 100 amps, the motor gives a result according to this, but I think I got a result that did not enter saturation.

 

An ANSYS employee said this: ' Uncheck the option steady state since the input excitation is current ', but I could not find where this setting is.

Can you help me please?

 

 

[GLUO]

The BH data shows this material start to saturate above 1.5T. The red area in your field overlap plot means this area is saturated. As you increase the current, you should see the red areas grow larger. Can you observe such phenomenon in your plots?

 

[GLUO]

I cannot relate " Uncheck the option steady state since the input excitation is current " this comment to any settings here. 

[210223006]

I observe that the red areas increase as the current increases. The Force/current ratio in the graphs needs to be fixed, but it is constantly increasing and I cannot find a solution for this.