# Ansys Maxwell Transformer Transient Simulation

Member

I'm modeling the transformer shown below, with an applied voltage of 600*cos(2*pi*100000*time). I have assigned the primary winding resistance to 0.01uOhms and the secondary winding resistance to 10kOhms, and would expect the secondary induced voltage to be 600*(10/3) = 180V. When I run a transient simulation, however, this is not the case, and my results are are shown below. The voltages are extremely high and the secondary winding induced voltages are actually higher than the primary. I am using ferrite for the core, copper for the windings, and have created a region of air around the transformer. I also have length-based assigned mesh operations for the primary and secondary windings, with the max length set at 11mm. Any help would be greatly appreciated!

• Forum Coordinator

Hi,

As per the data provided by you.

Your primary winding turns (N1) = 3 and you are exciting it with a voltage of 600*cos(2*pi*100000*time)

Secondary winding turns(N2) = 10

Then, assuming an Ideal transformer case, secondary voltage = (primary voltage)*(N2/N1) = 600*(10/3) = 2000V

Since your secondary turns are more than 3 times primary turns you will have more than 3 times voltage on secondary winding terminals ideally.

So, what I see on the graph seems to be correct which is more than 1600 V on secondary.

Regards

Navya

• Member
edited October 21

I guess, there's a typo. The author sees 1.8kV (or 1.5?) on the plot and types/copypastes something (180V) by mistake, probably, or there is no sense to that.kV

So, the question is probably, where those lost 200-500V go?

• Member

@nchode @AndyJP Thank you for the quick responses! My primary windings (N1) = 10 and the secondary windings (N2) = 3, which is why I initially said that I expected the secondary voltage to be 600*(10/3) = 180 V from the ideal transformer relationship V2/V1 = N2/N1. I've double checked my design and winding 1 is assigned to the 10 turn coil and winding 2 is assigned to the 3 turn coil, so I'm really not sure why the voltage is being stepped up instead of stepped down.

• Member
edited October 21