Development of inductance simulation system for deflection yoke

In order to develop a high-performance deflection yoke (DY) for CRTs, a simulation system to evaluate the misconvergence and inductance of the DY has been developed. The system can treat the three-dimensional shape and winding pattern of the DY. In the inductance analysis, the inductance calculation is based on an Integral Equation Method (IEM) and magnetic flux method in which vector potential is integrated along the coils. This method requires no spatial mesh. For calculating the self-inductance, the DY coil is modeled by an equivalent radius model. In this model, several turns of coil are represented as one line element with equivalent radius. As this model can reduce the number of coil elements, the equivalent radius model is effective to reduce calculation time. The system has been applied to the DY. The difference between measured and calculated inductance is within 2%. The calculation takes place within 1 h CPU time using the Hitachi H9000/VR460 (PA-8000, 180 MHz). The shape and winding pattern of the DY fringe can be designed by the simulation system.