In d.c. machine iron losses occur in
Mechanical lossesoccur in the moving parts of the DC machine due to friction and windage. These losses are also called rotational losses. The mechanical losses depend upon the speed of the machine. In a DC machine, two types mechanical losses occur, which are as follows 1. Friction Loss– such as … See more The iron lossesoccur in the armature core of the DC machine since the armature core is subjected to the magnetic field reversal i.e. changing magnetic field. The core losses are of two … See more The copper lossesin a DC machine occur in the various windings of the machine due to currents flowing in them. In a typical DC machine, following copper losses occur ArmatureCopperLoss=Ia2Ra … See more The armature core of DC machine is subjected to magnetic field reversal when it passes under successive poles. An energy loss takes … See more When the armature of DC machine rotates in the magnetic field produced by the poles, an emf is induced in the core and due to this induced … See more WebAug 1, 2024 · 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 …
In d.c. machine iron losses occur in
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WebQuestion: 8) 8) Iron losses occur in the armature of a DC machine. A) True B) False 9) 9) A DC motor running at no load develops no useful power. A) True B) False 10) 10) At no … WebIn a dc machine mechanical losses occur due to (a) air resistance of rotation to armature and fan. (b) brush friction. (c) bearing friction. (d) all of the above. SHOW ANSWER 17. In a dc machine, mechanical losses are primarily function of (a) voltage. (b) current. (c) speed. (d) none of these. SHOW ANSWER 18.
WebThe following article presents a computation procedure that enables us to simulate the dynamic states of electric machines with a laminated magnetic core, with direct consideration of the eddy current losses. The presented approach enables a significant reduction of the simulation process computational complexity. The verification of the … Web(a) List any four (4) types of losses that occur in DC machines. (4 marks) (b) A 240 V, 1500 rpm DC shunt motor draws a current of 65 A during half load operation. The rotational losses are 1500 W at rated power output. The armature circuit resistances are given as 0.05Ω and 120Ω, respectively.(i) Calculate the efficiency and torque of the motor under …
WebMar 4, 2014 · The losses in d.c machines (generator or motor) may be divided into three classes viz (i) Copper losses (ii) Iron or core losses (iii) Mechanical losses. All these … WebIn the treatment of core losses in direct-current machines, the four principal sources of losses are considered, namely-armature ring loss, armature tooth loss, eddy currents in …
WebSep 13, 2024 · The present invention discloses a cooling system (4) for outrunner brushless DC motor (1) which includes a radial heat transfer element (41) having a plurality of fins (413) on its outer surface where the radial heat transfer element (41) is fitted in the stator core (21) to extract heat from the stator (2). The heat from the radial heat transfer …
WebMar 8, 2024 · In a DC generator, the iron losses mainly take place in ________ Yoke Commutator Armature conductors Armature rotor Show Explanation 6. A DC generator delivers a 30-A current to a load at 120 V by consuming 4500 J/s of mechanical energy. Determine the efficiency of the generator. 90% 85% 75% Show Explanation 7. small house in torontoWebThe iron losses occur in core of the armature of a DC machine due to rotation of the armature in the magnetic field. Because these losses occur in core of the armature, these … small house layout plansWebThe losses which occur in the iron parts of a DC generator are known as iron losses or core losses or magnetic loss. These losses consist of the following: Hysteresis loss. Whenever … small house landscape lightingWebFeb 24, 2012 · These losses occur due to current flowing in stator and rotor windings. As the load changes, the current flowing in rotor and stator winding also changes and hence these losses also changes. Therefore these losses are called variable losses. The copper losses are obtained by performing blocked rotor test on three phase induction motor. small house lifts priceWebwhere. P i0 = no-load core (iron)-loss (constant). P wf = windage and friction loss (constant) (2) Variable losses, where. P c = 3I 2 R, the copper-loss (factor 3 will not be present in a dc machine); R is the resistance parameter of the machine.. P st = stray-load loss (copper + iron) = αI 2 (Here the stray-load loss is assumed proportional to the square of the load … sonic greek mythologyWebFeb 26, 2024 · Mechanical Losses in DC Machine: The losses associated with mechanical friction of the machine are called mechanical losses. These losses occur due to friction in … small house laundryWebNov 30, 2015 · The losses that occur in a DC Machine is divided into five basic categories. The various losses are Electrical or Copper losses (I 2 R losses), Core losses or Iron … sonic green hill music