全套的变压器设计资料.pdfVIP

坛 论 器 压 变 子 电 特 比 大 Ocl 94 Lloyd Dixon Summary: A brief tutorial on magnetic fundamentals leads into a discussion of magnetic core properties. A modified version of Intusoft s magnetic core model is presented. Low1requency hysteresis is added to the model. making it suitable for magnetic amplifier applications. Magnetic Fundamentals: Units commonly used in magnetics design are given in Table I, along with conversion factors 坛 from the older cas system to the SI system sys- 论 feme infernational- rationalized MKS . SI units are Fig 1. -Magnetic Core B-H Characteristic used almost universally throughout the world. 器 Equations used for magnetics design in the SI surface of Fig. 1 represents energy per unit volume. 压 system are much simpler and therefore more intu- The area enclosed by the hysteresis loop is unre- itive than their cas equivalents. Unfortunately, coverable energy loss . The area between the 变 much of the published magnetics data is in the cas hysteresis loop and the vertical axis is recoverable 子 stored energy: system, especially in the United States, requiring conversion to use the SI equations. W/m3 JHdB 电 Table I. CONVERSION FACTORS, CGS to SI 特 In Figure 2, the shape is the same as Fig. I, but the SI CGS CGS to SI axis labels and values have been changed. Figure 2 比 FLUX DENSITY B Tesia GaUSS 10-4 shows the characteristic of a specific core made 大 FIELD INTENSITY H A-T/m Oersted 1000/41t from the material of Figure I. The flux density axis PERMEABILITY space ~o 41t.10.7 1 41t.10.7 PERMEABILITY relative J.Iy 1 AREA Core, Window A m2 cm2 10.4 LENGTH Core, Gap . m cm 10.2 TOTAL FLUX JBdA ~ Weber Maxwell 10.8 TOTAL FIELD JHdf F,MMF A-T Gilbert 10/41t RELUCTANCE F/~ R 109/41t PERMEANCE 1/R L/N2 P 41t.10.9 INDUCTANCE P-N2 L Hen