I need answer within 20 minutes please please with my best wishes. Calculate the pitch factor for (a) fundamental (b) 3rd harmonic (c) 5th harmonic (d) 7th harmonic. Pole Pitch, Coil Span, Back Pitch, Front Pitch, Commutator Pitch in Armature Winding of DC Machines are explained in this video. It may be the full pitched or short pitch. It. coil pitch in terms of electrical angle3. The pitch factor, in rotating electrical machinery, is. 13. 0. Coil Span Factor: In a full pitch winding the coil span or coil pitch is always equal to the pole pitch which is equal to 180 electrical degrees. The winding pitch of a generator is the number of slots spanned by each coil in the stator winding divided by the number of slots per pole. • Coil span is nothing but the spacing between the two coil sides of a coil. In this case, there is a phase difference between the e. 26. The primary reason for making the coil span of a d. The coil span of the alternator is 1 to 8. Distribute the winding uniformly under different poles d. However in practise this often isn’t the best choise because of the high harmonic content. e. In such coils, the two coil sides are not under the poles. 6. Not ( I want a solution within 20 minutes because it is very urgent ) Q3//The armature of a 6600 volt, three-phase, 20-pole, 300 rpm star-connected alternator has 180 slots. 10. Calculate the emf generated in each phase when the machine runs at 375 rpm Hey Aspirants. If the coil span is equal to the pole pitch, then the armature winding is said to be full – pitched. The pitch factor, in rotating electrical machinery, is defined as the ratio of resultant EMF of a _____ a) full-pitched coil to that of a chorded coil b) full-pitched coil to the phase EMF c) chorded coil to the phase EMF d) chorded coil to that of a full-pitched coil View AnswerCalculate the pitch factor for an alternator winding with 36 slots, 4 poles, and coil span of 1 to 8. There are 2 coil sides per slot. 0. fs. (Assume lap. Hence emf induced in one side of. Get Coil Span or Coil Pitch Multiple Choice Questions (MCQ Quiz) with answers and detailed solutions. The distance between the two coil-sides of a coil is called coil-span or coil-pitch. This. Therefore one coil, such as coil 1 which traverses slot 1 and 7 falls under the north and south pole exactly because they are 180º apart as seen in the image above. Calculate the distribu factor for a 36-slot. may or may not be exactly equal to pole pitch B. When the parallel path is twice the number of poles then it is known as Duplex Lap Winding. 2 are short-pitched, full-pitched and over-pitched coils respectively. 4 pole = 90º. Coil Span: It is the angular distance between the two sides of the coil. If the coil span is equal to the Pole pitch then it is called a full pitch coil. Slots/pole/ph = m = 72/ (8×3) = 3. Here, e = E 1 = E 2 = E. Discuss the effect of making the coil span very different from the pole pitch on (a) the coil emf and (b) the coil torque. Number of slots: 3 Number of poles: 2 Number of phases: 3 Number of layers: 1 Coil span : 1 Number of slots per pole per phase: 1/2. In a 4 pole, 3 phase alternator, armature has 36 slots. A 4 pole, 12 slot lap wound dc armature has two coil side/slot. 1 the coil span should be approximately equal to a pole pitch. Concept: Coil pitch or coil span: It is defined as the angular distance between the two coil sides of one coil. 339 IC function as. 57 O 127. Petruzella. † ‡ ˆ ‰ Š ‹ Œ Ž ‘ ’ “ ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿPitch factor: Full-pitched coils i. 96 stator slots, 6poles, coil span 1to 12. 00 O…influence of slot/pole number (S/P) combinations on the rotor bar copper loss, a winding harmonic index is described in Section 2. u. Watch to understandPole Pitch, Full Pitch Coil, Short Pitch Coil, Coil span, Mechanical & Electrical DegreeThere are many people who want to. The pitch factor corresponds to the mean span of the coils of the winding with respect to the pole pitch while the distribution factor quantifies the flux reduction due do the winding distribution inside a finite number of slots. ( 2) The harmonic voltages decrease in a short pitch coil, thereby improving the waveform of the induced voltage in the winding. Download Solution PDF. How do you calculate winding pitch? Pitch Factor is calculated by dividing the coil throw (–) 1 (coil span) , by the number of slots per pole. Answer: 0. Determine the phase and line voltages if the coil is full pitched. The use of windings with a coil span of two slots promises a better balance between ohmic losses and end windings space on the one hand and harmonic content. Similarly, if the emf induced in coil sides 2 and 11 are E 2 & E 11, then the total emf in coil 2-11 is given as arithmetic sum of E 2 and E 11. The flux per pole is 0. 1 times the pole arc. β = 180o/ = 20o. Assuming double turn coil, Calculate the back pitch for progressive and retrogressive winding. round the coil which is the vector sum of e. Then, the pitch factor will be equal. 150 degrees c. 100+ Subjects. ∴ e = E 1 + E 2 = 2E. AC compound generator usually has lower resistance. Q2: For a 3-phase winding with 3 slots per pole per phase and coil span of 8 slots, compute the distribution and pitch factor for fundamental and 3 rd harmonics. g. 6. The. Pole pitch. Prelude to Synchronous Generator Induced E. phase shift with emf induced in the other side of the coil. In a short pitch coil, the coil span will be (180 – α)° electrical ( α = angle by which coils are short-pitched and always less than pole pitch ). Last updated on Nov 23, 2023 UPSC IES Final Result 2023 Out on 22nd November 2023!If α be the angle in electrical degrees, by which the span of the coil is less than a pole pitch in the alternator, then mathematically pitch factor is defined as. A full-pitch coil is one whose pitch is equal to the pole-pitch at the working harmonic. If α be the angle in electrical degrees, by which the span of the coil is less than a pole pitch in the alternator, then mathematically pitch factor is defined as. Both, 7/9 and 8/9, are equally close to 5/6 but I would select 8/9 for better flux utilization. Let us assume that, a coil is short pitched by an angle α (electrical degree). 363Wb and a 15% third harmonic. 10 A three-phase, wye-connected alternator has 15 slots/pole. Pole – pitch. Now labeling the starting end of each coil is easy,. Q: 3- Determine the coil span for 3-phase, two pole alternator, the pole pitch is equal to 18 slots and… A: For a two-pole alternator,Pole pitch = 18 slotsCoil span factor =32 Q: A 4 pole, three-phase, star-connected alternator has an armature with 120 slots and 4 conductors per…The winding pitch of a generator is the number of slots spanned by each coil in the stator winding divided by the number of slots per pole. 24 where polepitch of 4 has been assumed), then winding is called full-pitched. Coil span (also known as coil pitch) is defined as the peripheral distance between two sides of a coil, measured in terms of the number of armature slots between them. c. 866. F. The pitch factor [3], [6], [7], [8] is the ratio of coil voltages for a fractional-pitch winding to those for a full-pitch one. A 3-phase, 50 Hz, 2-pole, star connected turbo alternator has 54 slots with 4 conductor per slot. Lap winding • Suppose we want to make a lap winding for a P = 4 pole D. K pn = cos nα/2. Determine the pitch (or coil span) factors for the winding ,24 Stator slots ,4 poles, coil span 1 to 5 12. 1. ); and k y is the short pitch factor. 951: C) 0. 0. This advancement is measured in terms of armature conductors and is called back pitch. The formula for pitch factor is given by The pitch factor in the above equation is for fundamental component of emf. The flux per pole has a fundamental component of 0. 4 pole three phase winding. are e. 60o groups, 2-layer winding is used. it is defined as the peripheral distance between the center of two adjacent poles in a DC machine. For example, the below image shows the 2p6s machine with double layer winding with the coil span being 2 slots (120 degree electrical) instead of 3 slots (180. I need answer within 20 minutes please please with my best wishes. The width of the coils is 5/6 of the pole pitch. what is coil pitch or coil span. If each coil is short pitched by an angle of 36 ∘ electrical. For example, in a 6-pole armature having 96 slots, a coil spanning 15 teeth would obviously be a fractional-pitch or chorded coil (since pole-pitch is 16). The winding is housed in 360 slots and has 6 conductors per slot, the coils spanning (5/6) of a pole pitch. The value of α will usually be given in the question, if not, then assume kc = 1. Solution for For alternator having fractional pitch of 11/12 the coil span is a. m. If the coil span is from slot 1 to slot 21, and the flux per pole has a fundamental component of 0. Calculation: Given that, Number of coils = 16Q2: For a 3-phase winding with 3 slots per pole per phase and coil span of 8 slots, compute the distribution and pitch factor for fundamental and 3rd harmonics. number of slots and a coil span of two slots require at least 18 slots. Calculation:The angular distance between the two coil sides is less than one pole pitch, it is termed short pitch or fractional pitch coil. The value of α will usually be given in the question, if not, then assume kc = 1. The back pitch and front pitch adopted could be respectively. Its magnetic poles can be salient (protruding or sticking out from the surface of the rotor), as shown in Fig. in the two coil sides. 6-phase fractional-slot-per-pole-per-phase Interior Permanent Magnet (IPM) machine having a novel topology of 18-slot, 8-pole, and, 6-phase, 48-slot, 8-pole IPM with distributed windings, both. 4. If the coil pitch is shortened by 1/n of the pole pitch then the nth harmonic will be suppressed or the harmonics near to n will be with low voltage, because of the. Hence, the coil span in three phase AC machines must be (frac{5}{6}th) of pole pitch. It falls short by 1/6 pole-pitch or by 180°/6 = 30°. it is defined as the peripheral distance between the center of two adjacent poles in a DC machine. We make the coil span less than 180 degrees electrical space degrees in a fractional pitch winding. Pole pitch is the mechanical angle between adjacent poles, e. M. the coil will be in 180o. arrow_forward A. A pole pitch is defined as the peripheral distance between identical points on two adjacent poles. The coil span or coil pitch for short or fractional pitch coil is less than 180 electrical degrees. If t he coil pitch is y =3, the diame tral w inding w ill have the f. ) A 6-pole, 3-phase, 60-Hz alternator has 12 slots per pole and four conductors per slot. Each phase in this case consists of four coils (two per slot). generator, the back pitch of the winding must equal the number of (a) commutator bars per pole (b) winding elements (c) armature conductors per path (d) armature parallel paths. The theoretical coil pitch yp (or span) is the number of slot pitches between the two coil-sides of the same coil. 23. Obtain a full-pitch winding. If we used short pitched winding for armature winding than pitched factor is included in EMF equation in Alternator. A pole pitch is defined as the peripheral distance between identical points on two adjacent poles. A. Pole–pitch: A pole pitch is defined as the peripheral distance between identical points on two adjacent poles. The skew factor reflects the flux reduction if the winding is angularly twisted along the axis. 85 lagging. 71 O 120. Transcribed Image Text: (d) obtain a full-pitch winding. A 3-phase, 12-pole, star-connected alternator has 180 slots with 10conductors per slot and the conductors of each phase are connectedin series. A pole pitch is defined as the peripheral distance between identical points on two adjacent poles. . The distance between the two coil-sides of a coil is called coil-span or coil-pitch. Note. Despite its disadvantages, it is common in mass production. The coil span is 150°. If the coil span is equal to the Pole pitch then it is called a full pitch coil. Alternatively, this type of coil is also called a short-pitch or chorded coil. 85 lagging. The coil span is 150 electrical degrees. There are B coil groups of (A+1) coils, that is, 1 coilIf the pole span or coil pitch is equal to the pole pitch (as in the case of coil A in Fig. Determine the pitch factor for winding: 36 stator slots, 4-poles, coil spans 1 to 8. Publisher: McGraw-Hill Education. Expert Solution. Answer Coil span factor = 0. Calculate the RMS value of the induced emf per phase of a 10-pole, 3-phase, 60_Hz alternator with 3 slots per pole per phase and 4 conductors per slot in two layers. The correct answer is option 2): 5 slots Concept: Coil span (also known as coil pitch) is defined as the peripheral distance between two sides of a coil, measured in terms of the number of armature slots between them. 60 hz, 10-pole alternator has 120 slots and 4 turns in every coil. Where n is the nth harmonic. 6. The pitch factor corresponds to the mean span of the coils of the winding with respect to the pole pitch while the distribution factor quantifies the flux reduction due do the. Coil–span or coil-pitch. 0 C. 60o / 90o = 2/3. pitch factorThe flux distribution Curve of a smooth-core 50 c/s generator is. The flux per pole has a fundamental component of 0. pdf from CSE 302 at World University of Bangladesh. Coil–span or coil-pitch. 956 1. arrow_forward A four-pole three-phase 50 hertz, star connected AC generator has 12 stator slots. Alternator connections: star or delta connections of alternators suppress triplen harmonics from appearing across the lines 1. Thus, the total. 1, if the coil sides are placed in slots 1 and 7, then it is full-pitched. Calculate the rms value of the induced emf per phase of a 10-pole, 3-φ, 50-Hz alternator with 2 slots per pole per phase and 4 conductors per slot in two layers. armature winding equal to a pole pitch is to (a) obtain a coil span of 180º (electrical) (b) ensure the addition of e. If the coil. Commutator pitch Y C = ±1. • Winding pitch is the coil span divided by the pole pitch, e. Answer: c Explanation: Pole pitch is called as center to center distance between two adjacent poles. A 3-phase, 4 pole, Y- connected alternator has 72 slots with two conductors per slot. 15 Consider the armature conductor marked X in Fig 1. It is expressed in terms of number of slots per pole. Coil span σ, winding factor k w, pole ratio G r and N c for possible pole-slot combinations in the proposed FMPM machine. A pole pitch is defined as the peripheral distance between identical points on two adjacent poles. A pitch in the "region" of 5/6 is most effective to reduce 5th and 7th harmonics. If the coil span is equal to the pole pitch, then the armature winding is said to be full pitched coil. For a coil span of 13/15 of a pole pitch, the phase winding factor is: K_p = cos(π * 13 / (2 * 15)) = 0. Step by step Solved in 2. 1. It is given by K p = cos (α/2) Where α is the short pitch or chording angle. the coil span is (180-ε), therefore the emf induced in these coil sides will also be separated by this angle. BUY. Full Pitch and. It is expressed in terms of electrical space degree. The coil span is 150 electrical degrees. A 4-pole, 50-Hz, star-connected alternator has 15 slots per pole and each slot has 10 conductors. e. lt is also known as coil pitch. 0. 🔥engineers platform App Link. . Generally. 7. For a three-phase winding with 6 slots per pole per phase and with a coil span of 15 slots, the value of pitch factor is This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. The ratio of phasor (vector) sum of induced emfs per coil to the arithmetic sum of induced emfs per coil is known as pitch factor (Kp)or coil span factor (Kc) which is always less than unity. Pole pitch = S/P. e. (5/6) of a pole pitch. Last Answer : If the coil span is equal to pole pitch, the winding is called as full pitched winding. M. arrow_forward How to calculate the pitch factor of a 8 pole alternator with an armature wound coils having 18 / 24 fractioanl pitch. In this video basic terminologies related to AC armature winding like coil, conductor, coil side, front pitch, back pitch, pole pitch, coil pitch, etc. (BTL-1) 4. the core length 32 cm, and. (b) Determine the pitch (or coil span) factors for the following windings: i. The displacement between the sides of the coil is called the coil span. In a fractional pitch winding, the coil span is made less than 180 degrees electrical space. 985 (ii) Slots per pole = 72/6=12, for a coil span of 10 slots, the coil is short pitched by 2 slots and the chording angle is ε=2γ and γ=180/12 ⇒ ε = 30° ⇒ K p =cos15°=0. . This problem has been solved! You'll get a detailed solution from a subject matter expert that helps you learn core concepts. In a 4-pole, 35 slot d. If coil span is equal to pole pitch then it is called full pitch coil. Figure below shows a short pitched coil. 8 slots b. 2-pole star-connected, armature winding of a generator has 6 slots per phase. 3. 79. pole pitch5. Pole Pitch, Full Pitch Coil, Short Pitch Coil, Coil span, Mechanical & Electrical Degree - YouTube Hey Aspirants. placed in the top layer of the slot & the other side of the coil is placed in the bottom layer of another slot nearly a pole pitch apart. The reduction fraction is the pitch factor. Por a full-pitch coil, Kr = I (unity) r:or a fractional-pitch coil, Kr < 1 6. But, the given coil is short-pitched so that the coil span is $$\mathrm{coil\:span = (14 − 1)β = 13β}$$ $$\mathrm{∴\:α = (15 − 13)β = 2β = 2 × 12° = 24°}$$ Winding factor for fundamental component Pole pitchis defined as the peripheral distance between the center of two adjacent poles in a DC machine. (ii) Pole pitch: The over hang portion of the coils depend upon the coil. Hence pole pitch is equal to total numbers of armature slots divided by total numbers of poles, we alternatively refer to it as armature slots per pole. This answer is:Full-pitch windings have a coil pitch of 1, which means the coil span is equal to the pole pitch. Note that although the span of a full-pitch coil is not an integer in a fractional-slot winding, the full-pitch coil is nevertheless an im- The correct answer is option 3. 2 sin 70 wb/m? where O is angle measured from neutral axis. Let n be the number of slots per pole. Create a winding table for the given armature: Winding 1: 4 pole, 11 slots, 11 commutator segments, double layer, progressive, simplex WAVE winding Show the solutions. 1K 39K views 2 years ago AC Electrical Machines Jimit Tutorials In this video basic terminologies related to AC armature winding like coil, conductor, coil side, front pitch,. Coil is 12 slots. Assume a coil span of unity. 11. Solution : Coil groups per phase = 3 x 4 = 12 Slots per pole per phase, m =24/12 =2 Angle between adjacent slots, â =180/24 =30 For full pitch coils, the coil span, á = 0, ie. Use a diagram like that shown in fig. The arc diagram contains all the necessary information for connecting the pole-groups correctly. C machines short pitch winding is generally used to reduce harmonic and. 9780133923605. 05: B) 0. in the two sides of the coil. Question. Coil – span or coil-pitch: The distance between the two coil-sides of a coil is called coil-span or coil-pitch. Participate Now!Since 1 pole pitch is the angular distance between the two consecutive poles which is equal to 180 electrical degree, therefore the coil span for full pitch coil is also equal to 180 electrical degree. Study with Quizlet and memorize flashcards containing terms like A lap winding, Twice, Full-pitch and more. c. IMs designed by utilising the winding configurations given in Section 3 are analysed and both SS and FW performance characteristics are presented in Section 4. f. The random wire placement leads to a wider distribution of resulting wire length on the coil body and consequently a wider range of electric coil resistances. 06 weber distributed sinusoidally over the pole. , coil span is 180º electrical) is called a full-pitch coil. Fractional pitched windings are purposely used to effect a substantial saving in copper of the end connection and for improving commutation . of slots per pole = 15 but coil span is… question_answer Q: A synchronous generator is generating 320 V at 55 Hz at a field current of 3. The armature winding is housed in 360 stors with 6 conductors per slot. 75), the lowest 2-solt coil span. of consecu- tive turns (c) distribute the winding uniformly under different poles (d) obtain a full-pitch winding. When measured in electrical degrees one pole itch is equal to 1800. Let E 1, E 2 and E R be the emf induced in coil side lying under North Pole, South Pole and resultant of emf generated in both the active lengths of coil. 2 Winding design with star of slots The star of slots is a collection of phasors which illustrates allIf α be the angle in electrical degrees, by which the span of the coil is less than a pole pitch in the alternator, then mathematically pitch factor is defined as. If the coil span is less than the pole pitch (as in coil B where coil pitch is 3/4th of the pole pitch), then the. m. m. Share on Whatsapp India’s #1 Learning Platform Start Complete Exam Preparation Daily Live MasterClasses. An 8-pole lap wound DC generator has 120 slots having 4 conductors per slot. It has key variables such as Pole Pitch (back and front pitch, resultant pitch and communicator pitch, Coil Span, Commutator Pitch. 259 C. Since one pole presents 180 electrical space degrees so the slots pitch. 15. P˚ Kp = sin [(90°)(pitch)] Kp = sin 𝟐 PROBLEM 1: A 6 pole, 3Φ AC generated has 72 slots, the coil span is 12. f. m. to the induced emf in the same coil when it is full pitched is called a coil span factor or pitch factor or chorded factor and it is generally denoted be K p. The slots per pole per phase are 8 and the coil span is 20 slots. Degree of Reentrancy c. . Pole pitch is the electrical angle between the north pole and. The pitch factor corresponds to the mean span of the coils of the winding with respect to the pole pitch while the distribution factor quantifies the flux reduction due do the winding distribution inside a finite number of slots. The maximum pole flux is 8. Emf induced per coil side is E. Its value may be calculated by the equation kp=sin p°/ Where kp =pitch factor (always decimal for fractional-pitch winding) p° = span of coil in electrical degrees ( coil span/slot/pole x180°) Example: Calculate the. For n th harmonic. 125 Wb and a 25% third component. In the considered motor, the fundamental winding factor is equal to the skew factor due to unity fundamental coil-span and distribution factors. Calculation:When the coil sides forming a coil are spaced exactly one pole pitch a part they are said to be of full-pitch. If the coil span is less than the pole pitch, then the winding is said to be short-pitched. Result Number of. If the coil-pitch is one pole pitch, it is called the full-pitch coil. Fig. The coil-span is 144° (electrical). p Number of pole-pairs q Ratio of pole-width to pole-pitch Q Least number of slots in a doubly slotted machine Qs Number of coils per phase of distributed winding Ru Resistance of phase-belt, u = a,b,c R Matrix of branch resistances Sn Cross-sectional area of nth coil T Time-period vu Supply voltage of uth phase-belt, u = a,b,c α Mechanical. Show transcribed image text There are 3 steps to solve this one. Back pitch: The distance between the two sides of a coil in the back of the armature is called back pitch. PITCH FACTOR OR COIL SPAN FACTOR Pitch Factor – the ratio of the voltage generated in the fractional pitch coil to the voltage generated in the full pitch coil. 10 are one pole pitch or n slots or 180° electrical apart, the coil is called full pitch coil. Calculate the pitch factor for an alternator winding with 36 slots, 4 poles, and coil span of 1 to 8. The separation between the top and bottom sides of a coil is called Coil span. For making coil span equal to a pole pitch in the armature winding of a dc generator, the back pitch of the winding must equal the number of. Calculate the sinusoidally distributed flux per pole required to give a line voltage of 11 kV on open circuit, and the full. For example, in a 6-pole armature having 96 slots, a coil spanning 15 teeth would obviously be a fractional-pitch or chorded coil (since pole-pitch is 16). phase shift with emf induced in the other side of the coil. Better emf waveform in case of generators 6. , the case of short-pitch coil, the voltages generated in each coil side are not in phase. 4. A 3-phase, 4 pole, Y- connected alternator has 72 slots with two conductors per slot. The coil span is 150°. The phase spread is 60° and the flux per pole is 25-8 x 10 weber. pole pitch. If the coil sides are placed in slots 1 and 6, then it is short-pitched or fractional-pitched because coil span is equal to 5/6 of a pole-pitch. Boylestad. In a 4-pole, 35 slot d. must be exactly equal to pole pitch C. The harmonic reduction in the voltage waveform of concentrated winding axial field PM machines is the subject of interest for many researchers. The pole arc should be about 70% of pole pitch and length of core about 1. Share on Whatsapp Latest UPSC IES Updates. Pole pitch is always equal to 180o electrical. full, s. (c)Find the number of coils in a coil group, m. 955, whilst the second option gives (k_{sk1}) equal to 0. A four-pole three-phase 50 hertz, star connected AC generator has 12 stator slots. 7. In a 10 pole, lap wound de armature, the number of active armature conductor per pole is 50. We will start Red at slot 1. Draw the double layer winding layout for a 24 slot stator and 4 pole alternator 3. Answer: c Explanation: K p =cosε/2 (i) Slots per pole = 36/4=9, for a coil span of 8 slots, the coil is short pitched by 1 slot and the chording angle is ε=γ = 20° ⇒ K p =cos10°=0. Full pitch winding. • So coil span is 16/4 = 4. Distribution factor (K d): The ratio of induced emf in the coil group when the winding is distributed in number of. It is possible to suppress the higher harmonics by using double-layer windings using shortened span coils. Coil Span or Coil Pitch Question 1: For a 6 pole DC armature with 14 Slots having 2. If the coil span is equal to the pole pitch, then the armature winding is said to be full pitched. For n th harmonic. fs. 4, Fig. Thus, the total. The pitch of the coil has 4 slots less than the pole pitch. Back. Coil–span or coil-pitch: The distance between the two coil-sides of a coil is called coil-span or coil-pitch. Pole pitch is always equal to 180o. K pn = cos nα/2. Ratio of the pole arc to pole pitch: 0. Obtain a coil span of 180 degrees (electrical) b. The total flux per pole is 10⁶ lines. Determine the pitch (or coil span) factors for the winding , 96 Stator slots ,4 poles, coil span 1 to 18 13.