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  • عام

    The importance of electrical DC machines is well known in various engineering fields. Where, in this subject we provides the students by logical methods of explaining various complicated concepts and step wise methods to explain the important topics. in the subjects for, the basic concepts of magnetic circuit, an energy balance, the construction of  machines, principle of operations, characteristics of DC machines, calculations of losses , efficiency, speed controlling and the test methods of DC machines. The syllabus of DC includes the transformers, the generators and motors.

    machines s                                                                                                                  


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    • Magnetic Circuit

      Magnetic Magnetic Circuit


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    • DC machine Fundamental

      Construction of DC machines 


      DC machine parts



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    • Armature Reaction

      Effects of Armature Reaction

      .Magnetic flux density increases over one half of the core and decreases over other half «

       .The flux wave id distorted and there is a shifted in the position of M.N.A «

       .It cause the commutator problem «


       

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    • DC Generator

      An electrical generator is a machine which converts mechanical energy (or power) into electrical energy (or power)



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    • موضوع 5

      There are three types of Characteristics to the D.C Generator are: a.magnetizing or No-load, b. Internal, and c. External Characteristics   

      Characteristics of D.C Generator 

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    • Characteristics of DC Series Generator

      :In general the DC generators have the following characteristics

      ;The curve which shows the relation between no load voltage and the field excitation current is called magnetic or open circuit characteristic curve

      The internal characteristic curve gives the relation between voltage generated in the armature and the load current

      .(The external characteristic curve shows the variation of terminal voltage (V) with the load current ( IL



      Characteristics of D.C Generator

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    • موضوع 7

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    • موضوع 8

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    • موضوع 9

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    • موضوع 10

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