Learning Forum

[JGSub16]

I have recently set up a linear induction motor in Ansys Maxwell using the model provided in the Draw/UserDefinedPrimitive/RMxprt/LinearMCore. After adjusting the geometric parameters to my liking, I have set up the simulation and am wondering if I am doing everything correctly in order to model a 3 phase linear induction motor moving on an aluminum beam. Here is a picture of the set up as of now

As can be seen, I have set up 3 phases (U is blue, V is red, W is yellow) by taking a section in the XZ plane of every wiring and assigning a Coil Terminal to each i simulate a current. Each Coil Terminal has 10 wraps and is assigned to a specific excitation winding (i.e. U-PHASE). The windings are shown in the next picture

Each phase is offset by 2pi/3. So U = 50*cos(2*pi*FREQUENCY*time), V = 50*cos(2*pi*FREQUENCY*time - 2pi/3) and W = 50*cos(2*pi*FREQUENCY*time - 4pi/3).

Every successive winding has a different direction of current flow as shown in the pictures below.

Next I define a box called Collect around just the motor, and a box called Move that surrounds the Collect box and extends down the track 50in. I then assign a band to the Move box and have it move from 0-39.5in at a parameter called VELOCITY. 

Here are all the parameters it takes to find VELOCITY. I vary the DELTA_VEL when setting up an optometric analysis from 1-16 to simulate the motor moving at different speeds as the Thrust changes for different speeds. 

Is there anything I may be doing wrong? I have it set up and after running the simulation I am generating some odd values for thrust and induced voltage. My thinking is that its something to do with how I define the current in the wires. I want the current to be flowing through the entire wrapping, but I am not sure if setting a coil terminal inside an object makes the current follow the geometry all the way around or if it stops somewhere 

[Jake]

Could the problem be that the current excitation on the red phase is pointing in the wrong direction?

[Mark Solveson]

Does the Nominal problem produce correct results (before doing a parametric sweep)? 

To help diagnose the issue, try plotting the input current vs time to ensure it is as intended.  
Is the solution time step set small enough to capture 50 Hz waveform?  
Further simplify the model to help find the setup error:  
Try the model without Motion, Create Field Overlays at T=0, 1st time step, last time step, etc to ensure the materials and geometry is correct.  

[knnn]

Hi,

 

I am trying to simulate a linear induction motor as well, but when I assign a band it keeps telling me the geometry of the band has an error, and that moving parts are touching the stationary shell even when they are not. Can you help me with what I am doing wrong?

[dsteward]

Hi,

Check the limits of your motion.  Sometimes they're a little tricky to set and the initial position of the moving part might be in contact with the band.

[luna FERNANDNDEZ]

hii!

im Luna, im a student and i am currently working on a school proyect concerning linear induction motors. I have to design and analyse one, but im very lost. i was wondering if you could share your model with me, as it is exactly what im looking for. it would be of great help. 

let me know what you think, and i will send you my email. 

thanks you before hand

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[Masyood Ahmad]

hey!!

could you please explain how to take secondary/track of LIM ,Is it possible to take from rmxprt ??