Recent content by gerbi

This means, that moving/rotating element must be contained in single element i.e. rotor must be contained in a circle slightly larger than rotor outer diameter (circle for 2D simulation, obviously). Example: in case of a induction motor when rotor has outer diameter of 100 mm while stator has...

Well, you can always have Delta-Wye connection (Delta motor + Wye load with ground)... Otherwise just ground one of load legs (ground is needed as a reference point). I just hope you do FEM simulation to prove some previously designed and analytically analyzed concept. Designing a machine in...

Phase voltage unbalance may suggest that your model has some major issues. I'm sorry, but you need to review your model (geometry, excitation, parameter, motion setup and so on) and double check it for differences when compared to original design data. Then test it in no-load conditions...

100 Ohms is rated load ? I mean calculated from ohms law for generator rated voltage and current. I assume the load is also arranged in 3-phase manner.

Well, this is not a "torque fluctuating around zero" in the first place. Its seems like being periodic and with non-zero avg value. Negative value means, well, that it's a generator. First thing: is thit a no-load operation ? And second thing: how would expected result look like ? (Sometimes...

Nope. Try adding some wires to that coil which would act like a power supply.

So you need to adjust your geometry, there's no other way.

Oh, so the cylinders are not your coil. Okay. So, where's the coil ? cant's see it.

You can modify the size of "region" the way I just mentioned. Adjust it's size. Does this fix your problem ?

You're right. The problem is caused by too large "region". Reduce it's size so your excitation would be on the face of "region". In your case delete the "region", create a new one with option to "pad individual directions". Then input the parameters but remember that in X direction (-X and +X)...

Please note, that you're plotting a current density. Let's analyze this (from the top left, counter clockwise along the conduction path): 1) Thin conductor (high density, uniform as this is DC). 2) Wide copper plate connected to source and drain on it's corners top and bottom (non uniform...

Actually, this may be true. I see that some sources use %. Personally, I've never seen slip expressed in %.. so far. But those are old books, not in ENG. So - my bad.

The slip is in 0 - 1 range. So not a 10% but 0.1.

In this case there is a 40 deg/sec difference. Every second the relative position is changed by 40 deg. This means, that there is a relative motion. So, again: at slip s≠0 there is a relative motion between stator electrical speed and rotor body. This relative motion between them is constant at...

@cnh1995 Very good explanation. That's the theory. Ideally there are no eddy currents in synchronous machine rotor body and no voltage induced in it's excitation winding.. However in practice there are almost always some amount of eddy currents being induced. This is due to non-ideal machine...