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3-phase machine has 4 poles, 9 slots per pole and 4 conductors 4 per slot arranged in two layer lap-connected winding with coil span closely equal to 80% of the pole pitch. There are to be two distinct circuits per phase arranged for parallel connection. Develop a winding table, indicating clearly the start and finish of each phase winding and a circuit diagram for parallel connection. Also obtain effective turns per phase.?
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3-phase machine has 4 poles, 9 slots per pole and 4 conductors 4 per s...
Winding Table:

  • Number of slots per phase, q = 9 x 4/3 = 12

  • Number of coils per phase, Q = q/2 = 6

  • Number of turns per coil, N = 4

  • Coil span = 80% of pole pitch = 0.8 x 360/4 = 72 degrees

  • Number of slots per pole per phase, m = q/3 = 4

  • Number of coils per pole per phase, M = m/2 = 2

  • Number of turns per phase, Nph = Q x N = 24

  • Number of turns per pole per phase, Np = Nph/2 = 12



  • Phase A winding:


    • Start at slot 1, layer 1

    • Cross to slot 10, layer 2

    • Continue to slot 3, layer 2

    • Cross to slot 12, layer 1

    • Continue to slot 5, layer 1

    • Cross to slot 2, layer 2

    • Finish at slot 9, layer 2




  • Phase B winding:


    • Start at slot 4, layer 1

    • Cross to slot 1, layer 2

    • Continue to slot 8, layer 2

    • Cross to slot 11, layer 1

    • Continue to slot 6, layer 1

    • Cross to slot 9, layer 2

    • Finish at slot 2, layer 2




  • Phase C winding:


    • Start at slot 7, layer 1

    • Cross to slot 6, layer 2

    • Continue to slot 11, layer 2

    • Cross to slot 10, layer 1

    • Continue to slot 2, layer 1

    • Cross to slot 1, layer 2

    • Finish at slot 4, layer 2




Circuit Diagram for Parallel Connection:

  • Phase A:


    • Coils 1 and 4 in parallel

    • Coils 2 and 5 in parallel

    • Coils 3 and 6 in parallel




  • Phase B:


    • Coils 1 and 4 in parallel

    • Coils 2 and 5 in parallel

    • Coils 3 and 6 in parallel




  • Phase C:


    • Coils 1 and 4 in parallel

    • Coils 2 and 5 in parallel

    • Coils 3 and 6 in parallel

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3-phase machine has 4 poles, 9 slots per pole and 4 conductors 4 per slot arranged in two layer lap-connected winding with coil span closely equal to 80% of the pole pitch. There are to be two distinct circuits per phase arranged for parallel connection. Develop a winding table, indicating clearly the start and finish of each phase winding and a circuit diagram for parallel connection. Also obtain effective turns per phase.?
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3-phase machine has 4 poles, 9 slots per pole and 4 conductors 4 per slot arranged in two layer lap-connected winding with coil span closely equal to 80% of the pole pitch. There are to be two distinct circuits per phase arranged for parallel connection. Develop a winding table, indicating clearly the start and finish of each phase winding and a circuit diagram for parallel connection. Also obtain effective turns per phase.? for Electrical Engineering (EE) 2024 is part of Electrical Engineering (EE) preparation. The Question and answers have been prepared according to the Electrical Engineering (EE) exam syllabus. Information about 3-phase machine has 4 poles, 9 slots per pole and 4 conductors 4 per slot arranged in two layer lap-connected winding with coil span closely equal to 80% of the pole pitch. There are to be two distinct circuits per phase arranged for parallel connection. Develop a winding table, indicating clearly the start and finish of each phase winding and a circuit diagram for parallel connection. Also obtain effective turns per phase.? covers all topics & solutions for Electrical Engineering (EE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 3-phase machine has 4 poles, 9 slots per pole and 4 conductors 4 per slot arranged in two layer lap-connected winding with coil span closely equal to 80% of the pole pitch. There are to be two distinct circuits per phase arranged for parallel connection. Develop a winding table, indicating clearly the start and finish of each phase winding and a circuit diagram for parallel connection. Also obtain effective turns per phase.?.
Solutions for 3-phase machine has 4 poles, 9 slots per pole and 4 conductors 4 per slot arranged in two layer lap-connected winding with coil span closely equal to 80% of the pole pitch. There are to be two distinct circuits per phase arranged for parallel connection. Develop a winding table, indicating clearly the start and finish of each phase winding and a circuit diagram for parallel connection. Also obtain effective turns per phase.? in English & in Hindi are available as part of our courses for Electrical Engineering (EE). Download more important topics, notes, lectures and mock test series for Electrical Engineering (EE) Exam by signing up for free.
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