Current Sensor

An implementation of a nonlinear inductor where the inductance depends on the current. For best numerical efficiency, the underlying behavior is defined in terms of a current-dependent flux. In order to differentiate the flux to get voltage, a magnetizing lag is included. Simulation results are relatively insensitive to this lag provided that it is at least an order of magnitude faster than the fastest frequency of interest. Parameters for the source and lag are defined in the MATLAB® workspace so that the expected voltage can be calculated analytically.

A model of a shunt motor. In a shunt motor, the field and armature windings are connected in parallel. Equivalent circuit parameters are armature resistance Ra = 110 Ohms, field resistance Rf = 2.46KOhms, and back emf coefficient Laf = 5.11. The back-emf is given by Laf*If*Ia*w, where If is the field current, Ia is the armature current, and w is the rotor speed in radians/s. The rotor inertia J is 2.2e-4kgm^2, and rotor damping B is 2.8e-6Nm/(radian/s).

此示例展示如何使用基本磁库模块对变压器进行建模。变压器的额定功率为 50W、额定频率为 60 Hz 且额定电压为 120V/12V，并且假设效率为 94%、空载磁化电流为 1% 且漏抗为 2.3%。没有对磁芯损耗进行建模，并且假设磁芯材料的 B-H 特性是线性的。