Contents
What is the double layer winding?
In double-layer winding, all coils are of the same shape and size. Each coil has its one coil-side in top half of one slot and other coil-side in the bottom half of some other slot.
Which are the two main windings used in a DC machine?
In machine winding we have two main types of windings these are (a) lap winding. (b) Wave winding as shown in figure (3-1). In each type three are two modes (Progressive and Retrogressive). In the following only the simplex, two layers types will be discussed in order to declare the main ideas.
What is single layer and double layer?
The single layer windings used in high voltage machines use small groups of concentrically placed coils. Each layer may contain more than one coil side if large number of coils are required. For placing double layer windings, usually open slots are used.
Why are DC machine windings full pitched?
DC machine windings are full pitched winding only because it offers maximum induced emf within the coil. Number of conductors spanned by one coil at the front end of the armature. The distance between the staring of first coil and its next successive coil. Number of commutator segments between two successive coils.
How many types of armature winding are there?
Types of Armature Winding. The winding of the machine is classified into two types. They are closed type winding and Open type winding.
What is basic principle of DC motor?
The basic working principle of the DC motor is that whenever a current carrying conductor places in the magnetic field, it experiences a mechanical force. Fleming’s left-hand rule and its magnitude decide the direction of this force.
What is Layer winding?
The number of layers indicates the number of different coils in a slot. Integer-slot windings without any shortening of the coil pitch are single-layer windings. When the coil pitch is shortened, some slots can contain two different phases and consequently require two layers.
What is mean by single layer winding?
When each side of a coil occupies a slot completely without any other coil lying on top of it and the number of coils equals half the number of slots, the winding is known as single layer winding [1]. Concentric winding or chain winding types are common and in this type of winding, short-pitched coils cannot be used.
How does a series winding of a DC machine work?
In this way the winding progresses, passing successively every N pole and S pole till it returns to coil the side from where it was started. Thus the connections always progress in the same direction around armature instead of moving in alternate directions like that of lap winding.
How are single layer windings used in high voltage machines?
The single layer windings used in high voltage machines use small groups of concentrically placed coils. The interlinking between these coils is in such a way so as to minimize the space taken up outside the slot and in the overhang connections. It is shown in the Fig. 2.
How are coils arranged in two layer winding?
In this type of winding, there are two conductors or coil sides per slot arranged in two layers. Usually, one side of every coil lies in the upper half of one slot and other side lies in the lower half of some other slot at a distance of approximately one pitch away (Fig. 26.28).
Can a single layer winding be used for commutators?
In this type of winding, the complete slot is containing only one coil side of a coil. This type of winding is not normally used for machines having commutators. It is shown in the Fig. 1. In single layer windings permit the use of semienclosed and closed types of slots.