Three Phase Ac Winding Calculation

Three Phase Ac Winding Calculation

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  Winding

  The cop which is prepared in the ring frame is not suitable for further processing. So the yarn is converted into the shape of cone which is prepared in the winding. Practical experience shows that winding process alters the yarn structure. The factors which affect the yarn structure during winding are bobbin geometry, bobbin unwinding behavior, binding speed. This phenomenon does not affect the evenness of the yarn but it affects the properties of the yarn such as thick places, thin places, nep
• 1. Three-Phase AC Winding Calculations ( single-speed windings) Kinds of diagrams This calculations program includes all necessary details for rewinding three-phase motors: the type of windings, number of layers, parallel circuits, span and number of turns per coil , number and cross section of turn in a slot, as well as the winding diagram. The basis also includes about 400 most frequently used diagrams for 12, 18, 24, 27, 30, 36, 42, 45, 48, 54, 60, 72, 75 and 90 slots . There are two kinds: a complete diagram for single-layer windings ( diagram on the left) or internal connections between PPH – groups for double-layer windings (diagram on the right).
• 2. The calculations are made in terms of stator core dimensions. The calculation takes a few minutes. On the stator-core, the following measurements need to be taken: the length of the iron-core, internal diameter and the height of the back iron and tooth width. For calculation of cross-sectional area of turn you need also the slot dimensions. This program offers a quick and efficient service to those who have had experience working with motor winding as well as to beginners interested in solving every-day problems.
• 3. Operating this program is easy even for those who have no experience with computers. 1. – Precise measures give more accurate results 2. – All dimensions are given in millimeters. By following the prompts, you will be taken through the entire process. Areas marked in yellow are mandatory: voltage, frequency, connection: a  wye ( star) or a triangle (delta) , number of poles, the dimensions of the stator iron, tooth width and number of slots. The program will warn you if you forgot to write something or you typed in the wrong format. You will not be able to go on to the next page unless all areas have been marked correctly.
• 4. 3. – The program will offer you a list of all possible diagrams 4. – graphic test of flux density in the air gap, back iron, and teeth . Choose one, save or print it. . Choose the flux density so that the density in the back-iron, and teeth are within permissible limits (marked in green).
• 5.       5. To calculate the wire size, it is necessary to measure the slot. . 6. You have completed the calculations Write down the slot dimensions and the desired number of wires. The wire-size can be calculated in several different ways (the area of an old winding or a slot of a other shape or the cross section of all wires, etc . ). All details and calculation data can be saved and printed with the earlier diagram. … and that is all !!! You have already calculated the number of turns in a slot . . For more informations, please contact

Winding Calculation

Slub – catcher settings:

1. Fixed Blade = Carded - (2.0 to 2.5) x Diameter
   Combed - (1.5 to 2.0) x Diameterb.
2. 
   
3. Oscillating Blade = Smooth micro-set - 25% more than above
4. Serrated Blade = 100% more than the aboved.
5. Electronic yarn clearer = 3 cm x 3 Diameter

For Blended yarn = 10 to 15% more settings

Yarn clearer efficiency = 100 present (Faults removed )/(Faults Present)*100

Knot factor = (Total Breaks during winding(at faults))/No of Breaks due to objectional faults

Retained splice strength = Strength of spliced joint * 100 /Strength of parent yarn

Winding Tension = 0.1 x Single strength in grams

Optimum spindles / winder N = (4.8 * Y)/S OR

Expected efficiency E = 4500 * Y / (S * N(12 + 98))

Expected production P = (13 Y/(12+98) * C)/winder per 8 hrs in kg

Y = Length / Bobbin (meters.) B = breaks per bobbin
S = Winding speed (meters./min) C = English count

Winding Requirements

• Minimum fault: During winding always should be observed if yam fault become less. (To minimize the yam faults).
• No damage of yarn: There is a dame of yarn i.e. the yarn must not be damaged in any way in the winding process.
• Easy unwinding: Yarn to be wound so that it can be unwound easily.
• Suitable size and shape of the package: Size and shape should be proper.
• Economical condition: The package size should be controlled the particular economic requirements.
• Avoid excess loosened and tightness: Should be taken care.
• Cheap cost of package: The package should be cheap. Above all the process must be profitable.

Objectives of Winding

Elimination of disturbing yarn fault such as long thick places, long thin places, short thin places and short thick places.

• To get the continuous length of yarn on cones for weaving process.
• To wax the yarn during the winding process.
• To get high efficiency of machine, that is high production level.

Winding Process

After manufacturing of yarn, from different departments in the preparatory process and ring department, it is ready to make a shape into final cone form so that it can be shipped to customer for use. During winding process of yarn following objectives are met.

• Scanning and faults removing Electric Scanners (uster) are used for checking and elimination of yarn faults during winding process. This process is called Usterization of yarn. Such faults are called scan-cuts.
• Splicing of broken or cut yarn Auto splicing is done for broken yarn pieces to eliminate yarn knots and bad piecing.
• Bigger package Conversion of yarn from small ring bobbins to bigger yarn cones of different international standard or as per requirement of customer. During achieving above objectives or making of winding cones some faults are created during the process. These faults need to be controlled through monitoring and continuous study. Most of the winding faults are very dangerous for the next subsequent process which can be warping or knitting or doubling. We can face complains from customer of breakage of yarn during unwinding process.