What is mean by single layer and double layer winding?
1)Single Layer and Double Layer Winding : If a slot consists of only one coil side, winding is said to be a single layer. While there are two coil sides per slot, one, at the bottom and one at the top the winding is called double layer as shown in figure(b).
What do you mean by 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. The problem of overhang does not exist in double layer winding as it is in single layer winding as it is in single layer winding.
What is Layer winding?
[′lā·ər ‚wīn·diŋ] (electricity) Coil-winding method in which adjacent turns are laid evenly and side by side along the length of the coil form; any number of additional layers may be wound over the first, usually with sheets of insulating material between the layers.
Why armature winding is in stator in alternator?
Why Rotating Magnetic field: Like dc machine armature of the machine can be placed on the rotor and still we can operate the synchronous machine. Therefore for large rating machines (500kVA to 750MVA) armature is placed on the stator which requires no brushes to collect the large currents.
What are the types of armature winding?
Types of Armature Winding of Alternator
- Single phase and poly phase armature winding.
- Concentrated winding and distributed winding.
- Half coiled and whole coiled winding.
- Single layer and double layer winding.
- Lap, wave and concentric or spiral winding and.
- Full pitched coil winding and fractional pitched coil winding.
What are armature windings used for?
The first is to carry current across the field, thus creating shaft torque in a rotating machine or force in a linear machine. The second role is to generate an electromotive force (EMF). In the armature, an electromotive force is created by the relative motion of the armature and the field.
What is the difference between stator and armature?
The armature is the winding to which the load is connected. In small generators, the field windings are often on the stator, and the armature windings are on the rotor. In DC machines, both motors and generators, the armature is the rotor, and the field is the stator.
What kind of winding is an armature winding made of?
Armature winding is made of copper and consists of large number of insulated coils. These insulated coils may have one or more turns. These coils may either be connected in series and parallel depending upon the type of winding required.
What’s the difference between single layer and double layer windings?
Single Layer Winding Open winding may be either single layer or double layer type and are used in a.c. machines like induction and synchronous machines. The main difference between single and double layer windings is in the arrangement of their overhang. In single layer winding, the coils are arranged in groups.
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.
How are coils arranged in two layer winding?
The two-layer winding has two conductors or two coil sides per slot arranged in two layers. The conductors are arranged in such a way that, one side of every coil is on the upper half of one slot. Another side of the same coil is placed on the lower half of another slot. Such type of armature winding is employed in medium-sized machines.