Winding Pitches: Back Pitch: The distance between top and bottom coil sides of a coil measured around the back of the armature is called back pitch and is designated as yb. 2) Used as conductor in high current motor. These conductors are available as long straps in meters. Rectangular straps: It is used in open type slot motors.
It is wounded in reels and available in Kilograms. Round Wires: It has thin and thick conductors and are used in semi-closed slot type motors and mush winding rotors. 1) Round wires 2) Rectangular straps 3) Stranded wires 1.
TYPES AND SHAPES OF WINDING WIRES: The winding wires used in electrical motors are classified as follows. However the coils of both lap and wave windings are identically formed. 5 Photographs of the windings and coils DC Windings: Two types of windings (a) Lap winding (b) Wave winding These two types of windings differ in two ways (i) number of circuits between positive and negative brushes, (ii) the manner in which the coil ends are connected.
Such windings are used in AC machines.įig. Open windings: There is no closed path in the windings. Starting from any point, the winding path can be followed through all the turns and starting point can be reached. Single and double layer windings are shown in Fig 4Ĭlassification of windings: Closed type and open type winding Closed type windings: In this type of winding there is a closed path around the armature or stator. Double layer winding: Two coil sides are placed in a single slot. 3 Full pitched and short pitched coils Single layer winding: Only one coil side placed in one slot. Chorded winding: When the pitch of the winding is less than the full pitch or pole pitch then the winding is called short pitch winding or chorded winding.įig. 2 Single and Multi turn coils Full Pitch winding: If the coil pitch for a winding is equal to pole pitch the winding is called full pitch winding Fig. Pole Pitch: Distance between the poles in terms of slots is called pole pitch.įig. Winding: Number of coils arranged in coil group is said to be a winding. 1 Different types of winding coils representations Coil group: One or more coil single coils formed in a group forms the coil group. Coils may be single turn or multi turn coils. Coil: When one or more turns are connected in series and placed in almost similar magnetic positions. Turn: Two conductors connected in series and separated from each other by a pole pitch so that the emf induced will be additive. COMPUTER AIDED ELECTRICAL DRAWING (CAED) 10EE65 Winding Diagrams: (i) DC Winding diagrams (ii) AC Winding Diagrams Terminologies used in winding diagrams: Conductor: An individual piece of wire placed in the slots in the machine in the magnetic field.
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