Magnetic Circuits and Induction

Application of Permanent Magnet Motor

Application of Permanent Magnet Motor

Application of Permanent Magnet Motor: Application of Permanent Magnet Motor are given in Table 2.1. These properties are: residual flux density Br, coercive magnetizing force Hc maximum energy stored (BH)max and resistivity. Type A material is cheap but heavy, and suitable for low-rated production-run motors. Types B and C materials are hard and can be …

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Define Permanent Magnet in Magnetic Circuits

Permanent Magnets

Define Permanent Magnet in Magnetic Circuits: Define of Permanent Magnet is an important excitation source (life long) commonly employed for imparting energy to magnetic circuits used in rotating machines and other types of electromechanical devices. There are three classes of permanent magnet materials (or hard magnetic materials) used for permanent magnet dc (PMDC) motors: Alnicos, …

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Hysteresis Loss and Eddy Current Loss in Transformer

Hysteresis and Eddy-Current Losses

Hysteresis Loss and Eddy Current Loss in Transformer: When a magnetic material undergoes cyclic magnetization, two kinds of power losses occur in it Hysteresis Loss and Eddy Current Loss in Transformer which together are known as Core Loss in transformer. The Core Loss in transformer is important in determining heating, temperature rise, rating and efficiency …

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Energy Density Formula in Magnetic Circuit

Energy Density Formula in Magnetic Circuit: The Energy Density Formula of transformers, ac machines and several other electromagnetic devices are excited from ac rather than dc sources. With ac operation, inductance is effective even in steady-state operation. Often, the flux is determined by the impressed voltage and frequency, and the magnetization current has to adjust …

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Magnetic Properties of Materials

Magnetic Materials and Their Properties

Magnetic Properties of Materials: Magnetic Properties of Materials – From the magnetic point of view a material is classified according to the nature of its relative permeability (μr). All nonmagnetic materials are classified as paramagnetic ,μr slightly greater than 1, and diamagnetic, μr slightly less than 1. For all practical purposes, μr of these materials …

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BH Curve Relationship of Ferromagnetic Material

BH Curve Relationship (Magnetization Characteristic) for Ferromagnetic Material: In free space (also nonmagnetic materials), the permeability μ0 is constant so that BH Curve Relationship is linear. This, however, is not the case with ferromagnetic materials used in electric machines, wherein the BH Curve Relationship of Ferromagnetic Material is strictly nonlinear in two respects saturation and hysteresis. …

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