{"id":19914,"date":"2022-08-13T08:18:41","date_gmt":"2022-08-13T08:18:41","guid":{"rendered":"https:\/\/mdr.foobrdigital.com\/?p=6303"},"modified":"2022-08-13T08:18:41","modified_gmt":"2022-08-13T08:18:41","slug":"armature-winding-in-dc-machine","status":"publish","type":"post","link":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/2022\/08\/13\/armature-winding-in-dc-machine\/","title":{"rendered":"Armature Winding in DC Machine"},"content":{"rendered":"\n

Armature winding is defined as an arrangement of conductors to produce EMF by relative motion in a magnetic field.<\/p>\n\n\n\n

In a\u00a0DC machine, the armature is a rotating part. And it provides housing to the armature winding.<\/p>\n\n\n\n

There is a number of slots available in the armature core and these slots in which conductors are housed.<\/p>\n\n\n\n

As we have seen in the\u00a0construction of a DC machine, the armature is placed between the magnetic poles and it is free to rotate.<\/p>\n\n\n\n

The conductors are connected in parallel to increase the\u00a0voltage\u00a0rating and the conductors are connected in series to increase the current rating.<\/p>\n\n\n\n

Here you can find the various terms that are related to the armature winding;<\/p>\n\n\n\n

Terms Related to Armature Winding<\/h2>\n\n\n\n

1) Conductor<\/strong><\/p>\n\n\n\n

The active length of wire in which EMF is induced in armature winding is known as a conductor. It is also known as the length of wire embedded in the slot of an armature.<\/p>\n\n\n\n

2) Turn<\/strong><\/p>\n\n\n\n

When two conductors placed in different slots connected together, it forms a close path is called a turn.<\/p>\n\n\n\n

3) Overhang<\/strong><\/p>\n\n\n\n

The portion of a coil that is not participating in the energy conversion process. But it is used to provide a connection between two active conductors known as an overhang.<\/p>\n\n\n\n

4) Coil<\/strong><\/p>\n\n\n\n

The two active conductors along with the overhang create a coil. The coil may be single turn or multi-turn.<\/p>\n\n\n\n

5) Coil side<\/strong><\/p>\n\n\n\n

A coil consists of two coil sides placed in different slots.<\/p>\n\n\n\n

6) Coil span (coil pitch)<\/strong><\/p>\n\n\n\n

The distance between two coil sides of a coil is known as coil span or coil pitch. It is measured in terms of armature conductors.<\/p>\n\n\n\n

7) Pole pitch<\/strong><\/p>\n\n\n\n

The total number of armature conductors divided by the number of poles is known as pole pitch. It is denoted as \u03c4p<\/sub>.<\/p>\n\n\n\n

It is also defined as the periphery of the armature divided by the number of poles.<\/p>\n\n\n\n

\"\"<\/figure>\n\n\n\n

In simple words, the pole pitch is the distance between the two adjacent poles.<\/p>\n\n\n\n

  • If the coil span is equal to pole pitch, the winding is known as full-pitched winding.<\/li>
  • If the coil span is less than the pole pitch, the winding is known as short pitch winding.<\/li><\/ul>\n\n\n\n

    8) Back pitch<\/strong><\/p>\n\n\n\n

    The back pitch is defined as the distance between the top and bottom coil sides of a coil (measured from the back of the armature). It is denoted as Yb<\/sub>.<\/p>\n\n\n\n

    The back pith is measured in terms of armature conductor or coil sides. It is always an odd number and nearly equal to pole pitch.<\/p>\n\n\n\n

    9) Front pitch<\/strong><\/p>\n\n\n\n

    The front pitch is defined as the distance between the two coil sides connected to the same commutator segment. It is denoted as Yf<\/sub>.<\/p>\n\n\n\n

    The front pitch is measured in terms of armature conductors or coil sides. It is always an odd number.<\/p>\n\n\n\n

    10) Winding pitch (Y)<\/strong><\/p>\n\n\n\n

    The winding pitch is defined as the distance between starting ends of two nearby coils. It is denoted by Y and it is always an even number.<\/p>\n\n\n\n

    For lap winding: Y = Yb<\/sub> -Yf<\/sub><\/p>\n\n\n\n

    For wave winding: Y = Yb<\/sub>+Yf<\/sub><\/p>\n\n\n\n

    11) Commutator pitch<\/strong><\/p>\n\n\n\n

    The distance between two commutator segments where the starting and finishing end of a coil are connected is known as the commutator pitch. It is measured in terms of commutator segments.<\/p>\n\n\n\n

    Types of Armature Winding<\/h2>\n\n\n\n

    According to the connection of a conductor, the armature winding of a DC machine is classified into two types;<\/p>\n\n\n\n

    • Lap Winding<\/li>
    • Wave Winding<\/li><\/ul>\n\n\n\n

      Lap Winding<\/h3>\n\n\n\n

      In lap winding, there are many parallel paths and the number of parallel paths is equal to the number of poles in a DC machine.<\/p>\n\n\n\n

      Hence, this winding is known as multiple winding or parallel winding.<\/p>\n\n\n\n

      It is necessary to use lap winding when the machine is used for an application where a large current is required.<\/p>\n\n\n\n

      Therefore, the lap winding is suitable for comparatively low voltage and high current DC machines.<\/p>\n\n\n\n

      \"\"<\/figure>\n\n\n\n

      In lap winding, the coils overlap each other. An equalizer connection is required in case of lap winding.<\/p>\n\n\n\n

      In lap winding, the starting and finished ends of a coil are connected to the adjacent commutator segments.<\/p>\n\n\n\n

      Hence, the finishing end of the first coil connects to the same commutator segment as the starting end of the second coil. And so on.<\/p>\n\n\n\n

      Conditions for simplex lap winding:<\/p>\n\n\n\n

      • The back pitch and front pitch must be nearly equal to the pole pitch.<\/li>
      • The back pitch and front pitch must be odd numbers. And both should not be equal but the difference between them should be equal to 2.<\/li>
      • Commutator pitch should be \u00b11.<\/li>
      • Winding pitch should be even number.<\/li><\/ul>\n\n\n\n
        \"\"<\/figure>\n\n\n\n

        Where,<\/p>\n\n\n\n

        C = Number of coils
        P = Number of poles
        K = Number for making back pitch odd integer<\/p>\n\n\n\n

        Wave Winding<\/h3>\n\n\n\n

        In wave winding, the number of parallel paths through the armature winding is equal to two (A=2). The wave winding is also known as series winding.<\/p>\n\n\n\n

        Generally, the wave winding is used in high voltage low current DC machines.<\/p>\n\n\n\n

        For the same number of pole and armature conductors, the wave winding gives more EMF than lap winding.<\/p>\n\n\n\n

        In wave winding, an equalizer connection is not necessary. To provide mechanical balance in the armature winding, sometimes, dummy coils are used.<\/p>\n\n\n\n

        In wave winding, the finishing end of the first coil is connected to the starting end of another coil that is located under a similar pole to the one under which the first coil started. It means the starting of two consecutive coils are nearly equal to twice the pole pitch apart.<\/p>\n\n\n\n

        The front-end connection will not overlap each other. And it looks like a wave. Therefore, this type of winding is known as wave winding.<\/p>\n\n\n\n

        \"\"<\/figure>\n\n\n\n

        Conditions for simplex wave winding:<\/p>\n\n\n\n

        • The back pitch and front pitch must be an odd integer. They may be equal or differ by 2.<\/li>
        • The winding pitch must be even number.<\/li>
        • Commutator pitch<\/li>
        • \u00a0<\/li><\/ul>\n\n\n\n
          \"\"<\/figure>\n\n\n\n
          • and it must be integer.<\/li><\/ul>\n\n\n\n
            \"\"<\/figure>\n\n\n\n

            Positive sign for progressive winding and Negative sign for retrogressive winding.<\/p>\n","protected":false},"excerpt":{"rendered":"

            Armature winding is defined as an arrangement of conductors to produce EMF by relative motion in a magnetic field. In a\u00a0DC machine, the armature is a rotating part. And it provides housing to the armature winding. There is a number of slots available in the armature core and these slots in which conductors are housed. […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[267],"tags":[],"_links":{"self":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/19914"}],"collection":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/comments?post=19914"}],"version-history":[{"count":0,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/19914\/revisions"}],"wp:attachment":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/media?parent=19914"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/categories?post=19914"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/tags?post=19914"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}