Synchronous Machine - Scalar Pot Solution

[bartoszlukasik]

My problem is defined like that. I am trying to find radial and tangential field distribution on a surface of the rotor of a large airgap synchronous machine. To do that I start from the general scalar potential equation solution in polar coordinates of the form pot = (ar+b/r)sin(teta). I take the gradient of this equation and have equations for both tangential and radial fields. Where I am struggling is finding a and b coefficients. In order to do it I need proper boundary conditions. So I assume two cases during the short circuit there are no radial fiel d only tangential so I can solve it for coefficients. During no load operation there is no tangential field on the side of the stator and I know the airgap flux density so I am able to find the coefficients. Is this the right approach.

 

[anorlunda]

I am only familiar with D-Q direct-quadrature frames of reference for synchronous machines.

ping @Charles Link , can you help with this spring cleaning post?

 

[Charles Link]

@anorlunda One suggestion would be to see the following thread: https://www.physicsforums.com/threa...for-a-salient-pole.925295/page-2#post-5882521 The techniques for solving the magnetic field for this one would normally employ Ampere's law/MMF equation as was done in the thread with the "link". The OP's question here is very general, but I think the "link" would be helpful for this topic.