Ideal Transformer on Load: In order to visualize the effect of flow of secondary current in a transformer, certain idealizing assumptions will be made which are close approximations for a practical transformer. A transformer possessing these ideal properties is hypothetical (has no real existence) and is referred to as the Ideal Transformer on Load. It […]
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Phasor Diagram of Transformer on No Load: Figure 3.5 shows the schematic diagram of a Phasor Diagram of Transformer on No Load with Two Winding, i.e. the secondary terminals are open while the primary is connected to a source of constant sinusoidal voltage of frequency fHz. The simplifying assumption that the resistances of the windings
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Electrical Machines: AC DC Converters AC Motor Control AC Windings Application of Permanent Magnet Approximate Circuit Model Approximate Equivalent Circuit Transformer Armature Control Armature Reaction Audio Frequency Transformer Definition Auto Transformer Back to Back Test on Three phase Transformers BH Curve Relationship Braking of DC Motors Brushless DC Motors Capability Curve of Synchronous Generator Characteristics
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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: 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: 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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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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Magnetic Circuit Calculations: Normally magnetic circuit calculations involve two types of problems. In the first type of problem it is required to determine the excitation (mmf) needed to establish a desired flux or flux density at a given point in a magnetic circuit. This is the normal case in designing electromechanical devices and is a
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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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Magnetic Field Equation: The exact description of the Magnetic Field Equation Basics is given by the Maxwell’s equations and the constitutive relationship of the medium in which the field is established. Such description apart from being highly complex is otherwise not necessary for use in electric machines wherein the fields (magnetic and electric) are slowly
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