Most toroidal transformers have high coupling, so a coefficient of close to 1 is usually OK. Only you know what the inductances should be.
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Now, the next problem you have is knowing how much inductance each winding has, and what is the coupling coefficient. The transformer model in both examples is the simplest kind of transformer model in SPICE. You can copy-and-paste from that schematic to your schematic. If you want one that is ready-made, go to your C: drive, then look in the folder Documents\LTspiceXVII\examples\Educational\ and find the file Transformer.asc. Find helpful customer reviews and review ratings for The LTSpice IV Simulator: Manual, methods and applications at. The pure power, speed and accuracy of its simulations and its robustness make it an irreplaceable tool.
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Make sure to use a "SPICE Directive" (black text) and not "Text" (blue text). Commands and Applications With more than 20 million users worldwide, LTspice XVII is the industrys definitive electronic simulation software. Just use two ordinary inductors (they can be positioned and oriented any way you want, they don't even need to be near each other), and add one "SPICE Directive" with the K1 statement anywhere on the schematic. Those three things are the transformer, but you will need to add them yourself to your schematic.
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Just replicate L1, L2, and the K1 statement. Notice what's in the schematic on the Help screen. In the contents on the left, open LTspice, then F.A.Q., then "Simulating Transforders". Anne wrote, "It would be nice just to find example model of single transformer to "cut and paste "," I have two simple examples for you: Please follow the information I already gave you: 1.