Influence of id-od ratio on magnetic properties of toroidal cores

The optimization of toroidal core shapes for use in self-saturating magnetic amplifiers requires a knowledge of the influence of id-od ratio on apparent core magnetic properties. A theoretical result was derived assuming a parallelogram-shaped basic hysteresis loop and an elaborate experiment was performed. The possibility of doubling the gain of a push-pull amplifier stage by changing the core height and radial build-up to increase the id-od ratio without changing the iron area was shown.