![what is motor winding what is motor winding](https://thumbs.dreamstime.com/z/copper-electric-motor-winding-mechanism-rotor-dark-background-coil-electrical-electricity-electromagnet-energy-engineering-160057785.jpg)
In a 24-slot stator there would be 2 coils per group. For example, if we substitute a 48-slot stator the diagram does not change, but the number of coils per group increases from 3 to 4. The number of arcs is equal to the number of pole-groups, and so the number of coils per group equals the number of coils divided by the number of arcs: in this case, 36/12 = 3.Ī remarkable property of this diagram is that it is independent of the number of slots and coils. So as not to touch or overlap adjacent arcs, the angular extent of this arc (in slot-pitches) is a little shorter than the number of slots per pole per phase, in this case 3 slot-pitches. The compact diagram represents each pole-group by a simple arc. If parallel connection is intended, the EMFs generated in all the parallel pole-groups must be identical in magnitude and phase. S and F are waiting to be connected to the other pole-groups, according to the main diagram. Its start point ( S) is the leading tail of the first coil in the group, and its finish point ( F) is the trailing tail of the last (third). One of these groups is highlighted in the developed diagram. In this example with 36 coils, 3 phases, and 4 poles, the coils naturally fall into groups of 3, that is, 36/(3 × 4). The compact diagram shows the pole-groups.
#What is motor winding series#
In the following, we assume that all the coils are identical, and laid up all in the same direction in a regular fashion their polarities are then determined by the interconnectors, and what is vitally important in the winding-shop is to connect them up in groups with the correct polarities, in the correct series or parallel paths, and in the correct phases. For this reason an extremely compact form of connection diagram is often used, particularly in winding-shops. In machines with many slots the developed diagram can become very intricate, especially when the winding is designed for a variety of series/parallel connections. Each coil is represented in the developed diagram by a polygon with triangular “end-windings”, sometimes called a “diamond coil”. The bottom coil-sides are shown with dashed lines, because they are hidden behind the top coil-sides when we look outwards from the axis. The coils are all identical, and they are laid up so that one coil-side is in the bottom of a slot, and the other at the top near the slot-opening. This is what is known as a double-layer winding, one of the most common types. Each coil has two coil- sides, so there must be two coil-sides in each slot. The developed diagram shows only a few slots, but we can see that altogether there are 36 coils. If we rotate our view through 360° we will see all 36 slots. We have to imagine that we are inside the stator, somewhere near the centre-line or axis, and looking radially outwards towards the slotted inside surface.
![what is motor winding what is motor winding](https://wallpapercave.com/wp/wp5173704.jpg)
The term “developed” is borrowed from the geometry of cylinders, and it means that our view of the inside of the stator bore is rolled out on to a plane. The starting-point is the developed winding diagram at bottom left. In most respects it is a regular classical example, and the objective here is to review some of the features of the diagram and its conventions, rather than the winding itself or any particular machine. This winding could in fact be used with any AC machine, including a synchronous reluctance motor or a wound-field synchronous motor or generator.
![what is motor winding what is motor winding](https://www.electricmotorengineering.com/files/2019/05/Fig_01_b.jpg)
Here we see a winding diagram for a 3-phase AC induction motor or brushless PM motor (IPM), having 4 poles and 36 slots.