WebFeb 26, 2024 · Core Losses or Iron Losses in DC Machine or Magnetic Losses: As the iron core of the armature is rotating in the magnetic field, some losses occur in the core which … WebA good DC motor is that with fewer amounts of losses and better efficiency. There are some losses that occur in a DC motor during the power conversion which can be classified as follows. Electrical Losses = Copper …

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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 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 emf, eddy currents are circulated in the armature core. The power loss due to these … See more The armature core of DC machine is subjected to magnetic field reversal when it passes under successive poles. An energy loss takes place due to molecular friction in the material … 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 SeriesFieldCopperLoss=Ise2Rse … See more WebJan 22, 2024 · In the DC motor, iron losses occur in armature because the armature core is made of iron and it rotates in a magnetic field. Hence a small current gets induced in the core. Due to this current, eddy current losses and … crystalstile

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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 … WebMay 31, 2015 · The losses that occur in a DC Machine are divided into five basic categories. Electrical or Copper losses (I2R losses): The copper losses are the winding losses taking place during the current flowing through the winding. These losses occur due to the resistance in the winding. 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 losses appear as heat and thus raise the temperature of the machine.They also lower the efficiency of the machine. 1.Copper losses: These losses in dc machines occur due to currents ... dynamdb scan in .netcore