Modeling Stator Ring Coils in Multisim or Orcad

Yes I did. Now I am trying to make sure the circuit diagrams and everything will work right before I build it. As I stated earlier, I am trying to model a six coiled stator ring powered by three phase AC power. From the connection pictures on the web this can be accomplished by interconnecting three pairs of inductors, making the total number of inductors six, in a wye connection to the three phase AC power. I know how to use Multisim and Orcad for basic RCL circuits using DC and AC power but I am unsure as how to properly model the six coil stator ring. Multisim and Orcad has an option to use a three phase power supply in a wye connection to provide the voltage, however, I am unsure as to what to use to model the six coils, regular inductors or inductors with steel or iron inside them, and if I should connect opposite coils together in series to produce the three pairs of inductors before connecting them into a wye connection and how I would decide how many, if any, resistors and/or capacitors need to go in series or in parallel with the coils.

Any help trying to model a six coil three phase AC powered stator ring in Multisim or Orcad would be greatly appreciated.

Thank you.

Stephen

I never worked with Multisim, nor with Orcad. But I would recommend the following.

With six coils, you can make a 4 pole stator ring or a 2 pole stator ring .

If you follow the right hand rule, (this is the direction the current flows in your coil and the direction of the magnetical flux), you can connect the opposite coils in such a way, that the stator ring is 4 pole or it can be connected to be 2 pole.

Suppose you have six coils, named A, B, C, D, E and F. The coils A and D are laying opposite of each other.

If you connect coil A and coil D in series, and the flux from coil A points to the middle of the ring and the flux of coil D points outside the ring, you will get a 2 pole stator ring.

In the other case, if the flux from coil A points to the middle of the stator ring and the flux of coil D ALSO points to the middle of the stator ring, you get a 4 pole stator ring.

You can only make a 4 pole stator ring, if you have "enough" mechanical space in your stator ring to let the flux travel between the coils A and D.

Look at your watch/clock. If coil A is laying from 3 hours to 10 hours and coil D is laying from 4 hours to 9 hours, you can only make a 2 pole stator ring.

In this case the flux will travel from 6/7 hours to the middle of the watch and from the middle to 12/1 hours. The return path of the flux will be the outside of the watch. (from 1 hours over 2,3 etc until 6 hours and from 12 hours over 11,10 etc until 7 hours). Both coils push the flux in the same direction.

Now let explain a 4 pole stator ring. Suppose coils A is laying form 12 hours to 3 hours, and coil D is laying from 6 hours to 9 hours. If the flux from both coils A and D is pointing to the middle of the clock, the flux will 'leave' the clock between 4 and 5 hours AND between 10 and 11 hours. In this case you have 4 flux paths.

Path one : 2 - middle - 4 - outside clock - 2

Path two : 7 - middle - 5 - outside clock - 7

Path three : 8 - middle - 10 - outside clock - 8

Path four : 1 - middle - 11 - outside clock - 1

If you look back at the 2 pole stator ring, you see, that there are only two places for the flux to leave the stator ring. This can only be a 2 pole stator ring.

(remark, you could connect a 4 pole stator ring in such a case that it will be 2 pole, but than your have a lot of magnetic losses….)

Problem number 2, connecting coils in parallel or in series.

You can connect coil A and coil D in series, but you could also connect them in parallel. If the current flows in the right direction according to the desired number of poles, BOTH will work.

When connected in series, the supply voltage must be higher and supply current will be lower.

When connected in parallel this will be the opposite. This will bring you back to my previous answer, where the current per square mm cupper surface is limited to the quality of cooling the coils.

I suggest you use coils with iron inside them, this iron will guide/concentrate the magnetical flux. In reality you will also have an iron ring which support the coils and which will guide the field. (keep in mind that iron is different from steel, the permeability from iron is much better then steel)

A similar problem arises when choosing the value of the resistance in your model. The higher you choose the resistance, the less voltage you have to create your magnetical field. As practical guide, I would take 5% voltage over the resistive part of the coil and 95 % voltage over the inductance of the coil.

I would not use capacitors in the model, because at low frequencies (50 - 150 Hz) the error you make is negligible.

How did you solve your 3 phase power supply problem ?