Ansys Maxwell - 3PH Induction Motor - Part 1: Force & Thermal Coupling
Hello everyone, David Aguilio here with Ozen Engineering, Inc., an Elite Channel partner with ANSYS. In this video, I will show you how to start with Arm Expert to automatically create a 2D Maxwell design of a 3-phase induction machine.
You may view my previous blog and video, which detail the setup of the Arm Expert model of the 3-phase induction machine. Here's a step-by-step guide:
Starting with Arm Expert
- Run the simulation. In a matter of seconds, you will get the results.
- Right-click to create a Maxwell design and choose a 2D design. Although you can choose 3D, we will focus on 2D.
- Arm Expert automatically creates a 2D Maxwell design with a quarter symmetry model by default. Note that force coupling and thermal coupling are not set up by default.
Setting Up Force Coupling
- Select the stator and switch to edge mode.
- Select all of the stator edges, stator teeth, and stator joints.
- Click on the ribbon Maxwell 2D and enable harmonic force calculation.
- Select all of the edges and choose transient force for the time range.
- Set the time range from 0 to 0.2 seconds, equivalent to five cycles of 50 Hz excitation.
Setting Up Thermal Coupling
- Select all of the chordal cross-sections and edit the material copper.
- Choose a descriptive name for the thermal coupling and click on "thermomodifier".
- Edit the expression for temperature:
- If temperature is less than 20°C, multiply conductivity by one.
- If temperature is greater than 20°C, multiply by
1 / (1 + temperature coefficient of copper * (temperature rise - 20°C)).
- Set object temperatures and include temperature dependencies to start the simulation at a desired temperature, e.g., 40°C.
- Enable feedback for force and temperature coupling using the CFD tool, such as Fluent.
- In Optometrics, right-click and add a system coupling setup.
- Set up the analysis to save fields every time step from 0 to 0.2 seconds.
Running the Simulation
Once everything is set up, run the simulation. In less than two minutes, you will get all the results, including:
- Torque vs. Time
- Excitation Current vs. Time
- Voltage Winding vs. Time
- Flux Linkages vs. Time
- Applied Voltages vs. Time
- Electrical Power and Mechanical Power over time
The model is ready with all results and post-processing plots automatically set up for you. For efficiency maps and torque vs. speed curves, I will cover these in another video.
Conclusion
Thank you for watching. Please subscribe to our Ozen channel on YouTube to be alerted for future videos and to view existing content. For more information, contact Ozen Engineering for services, sales inquiries, mentoring, and consulting services. Have a nice day, and I'll catch you soon. Bye.
Ansys Maxwell - 3PH Induction Motor - Part 1: Force & Thermal Coupling Hello everyone, David Aguilio here with Ozen Engineering, an Elite Channel partner with ANSYS.
In this video, I will show you how to start with Arm Expert to automatically create a 2D Maxwell design of a 3-phase induction machine. You may view my previous blog and video which shows you how to go into the details of setting up the Arm Expert model of the 3-phase induction machine.
Starting with Arm Expert, run the simulation and in a matter of seconds, we get the results. And then from these results, we can right-click, create Maxwell design, choose 2D design. You can also choose 3D, but we simply choose 2D.
And in a matter of seconds, Arm Expert automatically creates for us the 2D Maxwell design. By default, it creates a quarter symmetry model and, by default, force coupling and thermal coupling is not set up. In this video, I will show you how to set this up.
So, before running Maxwell simulation, what we do for force coupling is, for example, select the stator, we can select, switch to edge mode, select all of the stator edges, stator teeth, and stator joints. And then we can go ahead and set up the arm.
We can see that Arm Expert, automatically creates for us the 2D Maxwell design and by default, it creates a quarter symmetry model. So, we can select, switch to edge mode, select all of the stator edges, one by one. Once we have this set up, we can set up the coupling.
After this, I will show you how to set up the thermal coupling. So, there are a few steps. Once this is done, we click edge, create objects from edge.
Once we have these edges already created, which would be useful for force coupling, we click on the ribbon Maxwell 2D and enable harmonic force calculation. We select all of the edges. We can leave this at the object base, for example, I want to leave harmonic force or transient force.
Let's switch to transient force, for example, advance. We select the time range. So, we want to start at zero seconds. We want to stop at, let's choose .2 seconds, which is equivalent to five cycles of 50 hertz excitation. Okay. So, the force coupling is set up.
Now, we'll go to the chordal cross-section. Select all of the chord cross-sections and then the material copper, choose edit, choose clone material. We want to give it a name which is descriptive for the thermocoupling, so click thermomod, we could choose thermomodifier and the expression none.
We edit this expression; it would need to be for temperature less than 20 degrees Celsius. Right multiply conductivity by one but if it's greater than 20 degrees Celsius, we want to multiply by one over one plus temperature coefficient of copper times the temperature rise minus 20 degrees Celsius.
Okay, then all this can be removed and we need brackets, we need three parentheses closing at the end. Okay, this is good.
So, if the temperature is less than 20 degrees Celsius, multiply conductivity by one if it's greater than 20 degrees Celsius, multiply by one over one plus temperature coefficient times temperature rise above 20 degrees Celsius. Okay, okay.
So now, the temperature is less than 20 degrees Celsius, and we need to take the temperature modify a setup and now we need to click on the ribbon, set object temperatures to select include temperature dependents, which allows us to set the temperature of each object.
So, if we wanted to start the simulation at a temperature other than 22 degrees, we could choose an operating temperature starting at 40 degrees Celsius, for example.
Set the temperature, click set the temperatures of the objects, change, then we could change the temperature depending on the temperature which we want to set. Click check, enable feedback. This is for the force on the temperature coupling, right?
The CFD tool that you choose, which can be this fluid for example. Click okay. And one last thing for setting up the thermocoupling is in the optometrics, right-click, add system coupling setup. Yes, we need to, one last thing for you.
So, we need to go to the analysis, set up safe fields every time set, right? So, from starting from zero to 0.2 seconds, right? We're gonna take every time set. That's required to set up the thermocoupling. So, once again, system coupling setup, okay.
We'll start with time zero and end time 0.2 seconds. And then we're gonna set up the thermocoupling. And it's good. We can leave it at the full settings. Okay. So, the Ansys tool gets the temperature as the input, and Maxwell will compute the loss output.
And then once Maxwell gives a loss output to the CFD tool, the CFD tool will give us the new temperature as input. Okay. So, this is good. Okay. Now we can run the simulation. Analyze and less than two minutes, maybe. Maybe a minute and a half.
We get all the results, but we can see the results developing over time. And we get those torque versus time, excitation current versus time, voltage, winding versus time, flux, ligages versus time, applied voltages versus time, and electrical power and mechanical power, right? Over time.
So, this model is ready to set up all, all the results, post-processing plots already set in place for you automatically for RMX, where you really don't need to do anything else or run the simulation.
If you just want a single analysis, electrical genetics, but if you want the force coupling, just follow the steps I showed you and you get the older results at the end. And you can create other plots as desired, using the results that the simulation generates for you.
And for efficiency maps and torque versus speed curves, I will show you how to do this in another video, but that is all for this video. Thanks for watching.
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