Skip to main content

Types of Armature Winding IN DC Generator

We have seen that there are number of armature conductors, which are connected in specific manner as per the requirements, which is called armature winding. According to the way of connecting the conductors, armature winding has basically two types namely,
a) Lap winding          b) Wave winding
1.1 Lap winding
       In this case, if connection is started from conductor in slot 1 then connections overlap each other as winding proceeds, till starting point is reached again.
       Developed view of part of the armature winding in lap fashion shown in the Fig. 1.
Fig. 1 Lap Winding
       As seen from the Fig. 1, there is overlapping of coils while proceeding.
Note : Due to such connection, the total number of conductors get divided into 'P' number of parallel paths, where P = number of pole sin the machine.
       Large number of parallel paths indicate high current capacity machine hence lap winding is preferred for high current rating generators.
1.2 Wave Winding
       In this type of connection, winding always travels ahead avoiding overlapping. It travel like a progressive wave hence called wave winding. To get an idea of wave winding a part of armature winding in wave fashion is shown in the Fig. 2.
Fig. 2 Wave winding
       Both coils starting from slot 1 and slot 2 are progressing in wave fashion.
Note : Due to this type of connection, the total number of conductors get divided into two number of parallel paths always, irrespective of number of poles of the machine. As number of parallel paths are less, it is preferrable for low current, high voltage capacity generators.
       The number of parallel paths in which armature conductors are divided due to lap or wave fashion of connection is denoted as A. So A = P for lap connection and A = 2 for wave connection.
1.3 Comparison of Lap and Wave Type Winding
 

Comments

  1. Thank you for offering such practical advice on choosing the right low voltage electrician. The emphasis on thorough research, checking credentials, and obtaining multiple quotes ensures I'll make an informed decision. Excited to find the perfect professional for my electrical needs!

    ReplyDelete

Post a Comment

Comment Policy
We’re eager to see your comment. However, Please Keep in mind that all comments are moderated manually by our human reviewers according to our comment policy, and all the links are nofollow. Using Keywords in the name field area is forbidden. Let’s enjoy a personal and evocative conversation.

Popular posts from this blog

Transformer multiple choice questions part 1

Hello Engineer's Q.[1] A transformer transforms (a) frequency (b) voltage (c) current (d) voltage and current Ans : D Q.[2] Which of the following is not a basic element of a transformer ? (a) core (b) primary winding (c) secondary winding (d) mutual flux. Ans : D Q.[3] In an ideal transformer, (a) windings have no resistance (b) core has no losses (c) core has infinite permeability (d) all of the above. Ans : D Q.[4] The main purpose of using core in a transformer is to (a) decrease iron losses (b) prevent eddy current loss (c) eliminate magnetic hysteresis (d) decrease reluctance of the common magnetic circuit. Ans :D Q.[5] Transformer cores are laminated in order to (a) simplify its construction (b) minimize eddy current loss (c) reduce cost (d) reduce hysteresis loss. Ans : B Q.[6] A transformer having 1000 primary turns is connected to a 250-V a.c. supply. For a secondary voltage of 400 V, the number of secondary turns should be (a) 1600 (b) 250 (c) 400 (d) 1250 A...

Condition for Maximum Power Developed In Synchronous Motor

The value of δ for which the mechanical power developed is maximum can be obtained as, Note : Thus when R a is negligible, θ = 90 o for maximum power developed. The corresponding torque is called pull out torque. 1.1 The Value of Maximum Power Developed        The value of maximum power developed can be obtained by substituting θ = δ in the equation of P m .        When R a is negligible,     θ = 90 o  and cos (θ) = 0 hence, . . .               R a = Z s cosθ   and X s = Z s sinθ        Substituting   cosθ = R a /Z s in equation (6b) we get,         Solving the above quadratic in E b we get,        As E b is completely dependent on excitation, the equation (8) gives the excitation limits for a...

Armature Voltage Control Method or Rheostatic Control of dc motor

Speed Control of D.C. Shunt Motor (Part2)  2. Armature Voltage Control Method or Rheostatic Control        The speed is directly proportional to the voltage applied across the armature. As the supply voltage is normally constant, the voltage across the armature can be controlled by adding a variable resistance in series with the armature as shown in the Fig. 1. Fig. 1 Rheostat control of shunt motor        The field winding is excited by the normal voltage hence I sh is rated and constant in this method. Initially the reheostat position is minimum and rated voltage gets applied across the armature. So speed is also rated. For a given load, armature current is fixed. So when extra resistance is added in the armature circuit, I a remains same and there is voltage drop across the resistance added ( I a R). Hence voltage across the armature decreases, decreasing the speed below normal value. By varyi...