Electrical machines account for about 60% of the electricity consumption in industrial countries; hence a huge energy savings could be achieved by even a small increment in the machine efficiency. Improving the designs of electrical machines requires accurate quantification of the machine losses. A significant portion of the losses in electrical machines is caused by the core loss in the.
The incorporation of coreless stator is not possible in single sided AFPMGs and therefore core loss cannot be nullified. The double rotor structure gives the provision of including the coreless structure of stator 17,18). However the strong attractive force between the two opposing PM-rotor disks in double rotor AFPMGS can cause the bending of the rotor disks with the consequence of closing.
Assuming that Magnetic Loss Separation still offers opportunities for a better understanding of the role of processing and microstructure of electrical steels to losses in machines, new relevant quantitative information about such relations will be presented. The effect of chemical composition, grain size, second phases, dislocations and texture on hysteresis, classic parasitic and anomalous.Iron loss is one of the major losses in electrical machines. The accurate prediction of the iron loss is essential for the electromagnetic and thermal design of electrical machines.Electrical steel (lamination steel, silicon electrical steel, silicon steel, relay steel, transformer steel) is an iron alloy tailored to produce specific magnetic properties: small hysteresis area resulting in low power loss per cycle, low core loss, and high permeability. Electrical steel is usually manufactured in cold-rolled strips less than 2 mm thick.
Multiple Choice Question (MCQ) of Electronics page-17:241. Which of the following statement is true? a) The saturation voltage V CF of silicon transistor is more than germanium transistor. b) The saturation voltage V CE for germanium transistor is more than silicon transistor. c) The saturation voltage V CE for silicon transistor is same as that for germanium.
Hargreaves PA, Mecrow BC, Hall R. Calculation of Iron Loss in Electrical Generators Using Finite-Element Analysis. In: IEEE International Electric Machines and Drives Conference (IEMDC). 2012, Niagara Falls, Canada: IEEE. Hargreaves PA, Mecrow BC, Hall R. Calculation of Iron Loss in Electrical Generators Using Finite-Element Analysis.
In dc machine iron losses cause a) heating in core b) loss in efficiency c) rise in temperature of ventilating air d) all of the mentioned View Answer. Answer: a Explanation: The iron losses cause heating of the core which causes reduction inefficiency and cooling air gets heated up. 5. For squirrel cage and slip ring induction motor, cooling methods is efficient in a) squirrel cage induction.
Losses in Transformers. There are two types of losses occurs in a transformer: Iron loss or Core loss P i; Copper loss or I 2 R loss P c; Iron loss or core loss (P i). Iron loss in transformers is the combination of hysteresis loss (P h) and eddy current loss (P e).This type of loss mainly occurs in the magnetic core of the transformer, and depends on magnetic properties of core material.
Copper loss in the compensating windings if any is I a 2 R c where R c is the resistance of compensating windings. Magnetic Losses or Core Losses or Iron Losses in dc machine. The core losses are the hysteresis and eddy current losses. These losses are considered almost constant as the machines are usually operated at constant flux density and constant speed.
Iron core loss is the major loss in electrical machines. It performs up to 25% of total machine losses. The machine efficiency calculation requires an accurate prediction of losses. The accuracy of losses calculation depends largely on the equivalent circuit parameter determination and measurements. In this paper, an accurate procedure of iron core loss determination considering the variation.
Iron losses of a machine are a. directly proportional to flux density b. directly proportional to the square of flux density c. inversely proportional to flux density d. inversely proportional to the square of flux density. 52. While considering hysteresis loss in a transformer under which of the following the loss will not increase a. when flux density is increased by 10% b. when thickness of.
The primary current on no load is usually less than 3 per cent of the full-load current, so the primary I 2 R loss on no load is negligible compared with the iron loss. The wattmeter reading can then be taken as being the total iron loss of the transformer. Figure 3 No-load or open-circuit test. Copper Losses.
Losses are generally defined as the difference between input and output voltage. In transformer two types of losses possible. mechanical loss and electrical loss. Mechanical losses include windage loss, friction loss etc. The electrical loss is further divided into iron loss or core loss and copper loss.
By using new composite materials and low-loss electrical SiFe steels, the losses in the magnetic flux conducting parts of the machine can be reduced significantly. However, it is necessary to have accurate but also easy implementable iron loss models to take the loss effects into account, preferable already during the first design steps and simulations of new electrical machines. The goal of.
Types of Losses in a Transformer There are various types of losses in the transformer such as iron loss, copper loss, hysteresis loss, eddy current loss, stray loss, and dielectric loss. The hysteresis losses occur because of the variation of the magnetization in the core of the transformer and the copper loss occurs because of the transformer.