Re: Synchronous machine (torque)
Jens, I am using version 4.3. I donot know how to apply current in opposite direction. Could you please eloborate it bit further. I shall be thankful.
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Jens, If possible, could you please share snapshots of changes you made, I do not know which version you are using, I am unable to open it in COMSOL 4.3 . Let me know. Thanks
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As I mentioned earlier my version is COMSOL 4.3.2.152, which is the latest as far as I know. You can find the version number eg in the first line of the messages window. If you have an ealier version...
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Dear Jens, Thank you very much. I have did all the modifications whatever you said. I have attached the fresh model. But when I apply stator and rotor excitation plus velocity to rotor simultaneously,...
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For now, I am trying to visualize stator and rotor fluxes simultaneously. Because I need to do saliency study of the motor, so I need to first make sure that my model is generating satisfactory flux....
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Hi Madhu your permenant magnets all all pointing inwards, if you invert every second you will see satisfactory results. Regards Jens
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Dear Jens, oh! yes I figured out that mistake and rectified it but still unable to see satisfactorily results. When I run simulation and see the animation, it seems my rotor body is rotating but the...
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Hi that is only a visualisation issue. E.g. goto Data Sets/Solution 1 and set Frame to Spatial. Jens
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Dear Jens, Thank you very much for your help, it makes sense now and yes it was visualization problem. Jens, I am extending my model to 24 slot stator now, could you please tell me how can I apply...
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Hallo Mahdu this depends on the wiring scheme that you want to apply to your machine. I cannot help from the distance. The will be six types of coil domains, three phase have an up and a down direction...
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Thanks Jens. Let me figure out my machine structure and than I will do winding accordingly. Jens, I am stuck in finding mutual and self inductances of machine, could you please help me in finding...
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Hi, Please see my attached model. I want to measure the inductances of the machine (self and mutual). I donot know how to go next to measure inductances, any help will be highly appreciated. My task...
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Hi, at this point I would use dq-transformation (=Park's transformation). Then self inductances are in direct and quadrature axis and the mutual inductance between the two. Is that what you need?...
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Hi Jens, I do not want to do dq transformation. Lets say my model is acting as a transformer i.e stator and rotor both are stationary, I want to calculate mutual flux liknage between phases and self as...
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For time being, I have excited phase-A by 100 Amp DC current - to see whether this method of finding out flux likage works or not. Thanks
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Hi, the flux variable is the correct flux computation. Jens
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Hi Jens, Thanks for the help. I have extended my model to 24 slot stator and it seems fine. Now, I want to calculate induced voltage in rotor circuit due to rotating stator flux. Could you please help...
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You can use mf.VCoil_7-mf.VCoil_8 to evaluate the voltages. I think your domains in the definition of +Ib are wrong. Regards Jens
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Hi Jens, Yes, I had a mistake in b+ domain - I have corrected that one but I am getting convergence error -unable to run the simulation : I am getting following error. Failed to find consistent initial...
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Hi Madhu, I suggest that you run a stationary simulation first, to make sure that the inital state is appropiate. When you start rotating, also it is a good idea to ramp the speed from 0 and not to...
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