In general, it is the factor (K p or K c) by which reduction in induced emf in the short pitch coil compared to the full-pitch coil. . First, determine the outer diameter. Previously, all of these dimensions were measured from centre to centre of the applicable conductors (as shown in the diagram below). The direction of the armature current is the same as it would actually be when the generator is loaded. Pipe Coil Length Calculator is useful for Calculating reuired length of your pipe coil. where: SP is the spring pitch in. For example, if there are 36 slots and 4 poles, then the coil pitch is 36/4 = 9 slots. C, spring index: C = D/d. Distributed Winding. Within the spring design, wire diameter, number of coils, and spring free length L0 are designed for a specific load, material and assembly dimensions, or spring diameter. Weaver’s article Numerical Methods for Inductance Calculation is used for calculations of inductance L S: where. It is defined as the angular distance between the central line of one pole to the central line of the next pole. The Front Pitch for DC Machine formula is defined as the coil advances on the back of the armature. f. n = (0. This helix coil formula can also be used to. G = E/(2(1 + v) The pitch of the spring coil can be found by . n = number of turns. The deflection before the coils are. See morePitch Factor is calculated by dividing the coil throw (–) 1 (coil span), by the number of slots per pole. A regular winding will have a number (say m) coil elements, separated by electrical angle ( gamma). μ0=4π*10-7. Based on the arrangement of conductors, there are several types of armature winding like drum winding, lap winding, wave winding, frog-leg winding, etc. The current sheet. The program uses formula published in the ARRL Handbook For Radio Amateurs and other radio publications. A pole pitch in an electrical machine is equal to 180° electrical. Two main parts of motor are rotor and stator. The distance between adjacent spring coils (defined as the coil pitch) is found by dividing the spring free length by the number of active coils, The rise angle of the spring coils (the angle between the coils and the base. Example: 30+20=50/2=25 (25 is the average Diameter of coil the multiply by pi) 25x3. It is expressed in BTU/lb and is normally designated by “H”. Pitch Factor is calculated by dividing the coil throw (–) 1 (coil span), by the number of slots per pole. The emf or voltage will be induced in the armature winding in the case of a generator, while it produces torque to rotate the shaft in the case of a motor. It may be the full pitched or short pitch. With CNC Bender the pitch of a tube coil is most affected by the coil twist ratio in the Push Bend Profile Table. The calculation is pretty simple. 1. 20um away, at x=250um, the field strength is 0. Distribution factor is defined as the ratio of phasor sum of coil emfs to the arithmetic sum of coil emfs. These factors represent the effect of coil distribution on the induced voltage waveform. Add to that Kapton tape in between layers (if needed). Steam heating coil sizing involves determining the required heat output in BTU/hr based on factors like steam pressure (PSIG), fluid flow rate (GPM), and desired temperature rise (°F). For a short pitched coil, the emfs need to be vectorially added. Wahl). During the formula’s design, the resistance, self-inductance,. Additional Information Pole Pitch: It is the angular distance between the two adjacent poles. Coil connections are such that both will try to set up a current in the same direction in the external circuit. 6) with the given linking number (475 in this case). It is connected to one-third of the commutator bars. Stretch = inches, from over-pull force. EC = EC1 +EC2 𝑬 𝑪 = 𝑬 𝑪 𝟏 + 𝑬 𝑪 𝟐 Since EC1 𝐸 𝐶 1 and EC2 𝐸 𝐶 2 are in phase, the resultant coil voltage is equal to their arithmetic sum ( Refer the figure of full-pitch coil ). To estimate the mutual inductance, when the gap between the two coils is larger than wire diameter, the thick coil can be denoted by equation of planar spiral coil [ 23 ]. Section view of a compression spring Source: Yapparina/CC [1. Y f = (2S / P) -1. 3. 50” • For 1/2" tube coils, fins are available in increments of 1. The shortest path between two points on a cylinder (one not directly above the other) is a fractional turn of a helix, as can be seen by cutting the cylinder along one of its sides, flattening it out, and noting that a straight line connecting the points becomes helical upon re. EXAMPLE: Calculate the pitch factor for a alternator winding with 36 slots, 4. The coil can produce a uniform. the equivalent integral-slot full pole-pitch winding (with one slot per pole phase and the same number of turns as the actual winding). 6 to 0. Rotor is usually made as squirrel-cage, and it is inserted in stators hole. Use a coil as a guide to apply the custom profile and sweep it along the 3D geometry. The spring pitch is the distance between adjacent coils of a spring and is typically measured in inches per coil. The number of parallel paths equal to the number of. ∴ e = E 1 + E 2 = 2E. First, using a semiempirical correction formula. It is expressed in terms of electrical space degree. Pitch can change from run-to-run if the coil feed mechanism varies in its setup or is showing wear. Below is the Inductance formula for a cylindrical coil. During the formula’s design, the resistance, self-inductance, and Q-factor are calculated according to the. Follow the formula below to calculate the spring pitch of a coil spring with open ends. machine has a large number of coils in slots in the armature and the distance between opposite sides of the coil is as near to a pole pitch as possible (Fig. in each coil side help each other. per coil is known as the coil span factor or pitch factor. Therefore, the coil pitch (Yp) is: Yp = 144 / 4 = 36 slots Now, let's calculate the coil pitch factor (Kp). Simply enter your numbers to determine flat rolled steel coil lengths and weights. This type of coiling design offers a number of advantages, and a wide range of products depend on variable pitch springs to deliver optimal performance. Using the Neumann integral formula, the expression of inductance is obtained. You do so by subtracting the amount of wires in the closed coils from the free length and then dividing the result by the active coils. NOTE: Sometimes, the "Path + Guide Surface" option will need to be used. To calculate the spring pitch, subtract 3 times the diameter from the length, then divide by the. Both equation 1 and the formula in White et al 1 show that the stiffness is proportional to the fourth power of the primary structure diameter (D 1). For 5/8 inch tubes, the triangular pitch is 1. ; 1 full pitch = 180° It is denoted by K p and its value is always less than unity. In a full pitch coil, the coil span will be 180° electrical (equal to pole pitch). The Coil Span Factor or Pitch Factor K C is defined as the ratio of the voltage generated in the short pitch coil to the voltage generated in the full pitch coil. ∴ EC =. Sheared blanks rely on coil pitch as the remaining sizing element. Watch to understandPole Pitch, Full Pitch Coil, Short Pitch Coil, Coil span, Mechanical & Electrical DegreeThere are many people who want to. A pole pitch is always 180 electrical degrees, regardless of the number of poles on the machine. 3. The coil pitch was determined to be two times the wire. The maximum gradient can be determined using the following formula: The following applies: Sa = minimum distance. kd = Vector sum of the voltage in two sides of a coil / Arithmetic sum of the voltages in two sides of a coil. The coil pitch was determined to be two times the wire. For a full pitch coil, the value of pitch factor is unity whereas for its value is also unity for concentrated coils. Therefore, for simple, collective pitch control a simple, modular, spring-mass description is adequate, while in individual pitch control (IPC), possibly coupled with vibration attenuation, a more complex, vector procedure is called for. The function of a compression spring is to withstand a certain pressure perpendicular to that spring. 50. 953. Easily adaptable for coil winding single or multiple coils; Motor Equipment: 2 HP (1. For example, if there are 36 slots and 4 poles, then the coil pitch is 36/4 = 9 slots. (v) For the number of phases, m, each repeatable group consists of m or 2m-phase belts. It is the separation between consecutive sides of a coil or consecutive bottom sides of a coil and is represented by (Yw). Enter the number of turns (windings). Transcribed Image Text: 1. The calculated results are only to be used as a guide and cannot be guaranteed. 9. The two sides of a coil are placed in two slots on the stator surface. It may be simplest feature to measure, but the number of coils accounts for an astonishing number of errors in drawings and in new product development. S = No. The welding calculator utilizes the above set of weld strength formulae to determine their. Spring pitch formulas usually take into account the: Geometry of the spring; Stress; Amount of force the spring will experience; Height; Amount of coils; Density of the. Though the formulas . (iii) All coils have the same pitch. The only problem with this type of winding is that its coil cost will be more than other types of winding. 3) You need to wind the coil for maximum Q by taking care to space the turns using wire that is not too thin because of resistance losses. ), which equals to pole pitch and the slot pitch . ᴫ 2. A SIMPLE explanation of Full Pitch and Short Pitch Winding. The angle \(\alpha = \alpha (\theta )\) designates the inclination of the helix with any plane perpendicular to the axis of the coil (pitch angle, lead angle). The helix angle references the axis of the cylinder, distinguishing it from the lead angle, which references a line. Wind the new copper wire as a coil using the same gauge as the wire already on the stator. pitch factor or coil. m = multiplicity factor. You can use any dimentional units such as Inches or MM as per your prefererance. Finally, calculate the Coil Length using the equation above: CL = (OD-WD) * pi. 026 = 192. Resultant pitch (Y R): Distance between the starts of two successive coils. P i t c h f a c t o r = W i n d i n g f a c t o r P o l e p i t c h. Only the amendment to the resulting inductance is added: where: ΔL is the amendment to the inductance of the close-winding coil (always negative) (µH) N - number of turnsPitch α refers to the angular displacement between sides of the coil, expressed in electrical radians. The winding pitch of a single-layer coil is defined as [egin{equation} p equiv frac{ell}{N} end{equation}] The proximity factor (Phi) is interpolated from empirical Medhurst data. For a full- pitch coil ( alpha=pi). through formula nes = N 2 mbnwcc n lay, (6) where bnwccis the largest integer less than or equal to nwc. across a coil will be algebraic sum of the two. Hence the resultant e. Generally, the calculation is based on the assumption that the pitch of the coil spring is fixed. In electrical machine, armature winding is distributed in the slots. C p = L f / n c. Please use the mathematical deterministic number in field to perform the calculation for example if you entered x greater than 1 in the equation y = 1 − x the calculator will not work and you. The Coil Length Calculator is invaluable for engineers and designers when creating coils for various applications, including inductors in electronic circuits, electromagnets, and transformers. ω = 2πN/60 = angular speed in rads per second. What would be the formula to calculate coil/spring winding length with a constant pitch if the wire is a flat ribbon? Much appreciated. The total number of spring coils is equal to the active coils in the spring. A stator winding using fractional pitch coil is called as a chorded winding. Tank coils are not generally used for the continuous heating or cooling of a flowing stream, but are usually applied in the heating or cooling of a liquid contained in a tank on a batch basis. 5 m and an inner radius of 0. In order to understand variable pitch springs, it’s important to know two key spring parameters: pitch and rate. Set Removal Set removal or presetting is a process used in manufacturing a spring to induce useful residual stresses. D is measured from the center of one coil to the center of the opposite coil along a plane normal to the spring axis; see Figure 2a. Set-up time is minimized by use of electronic controls for setting wire pitch and stopping at the desired turns count. L−HS The pitch factor is seen to be: \(\ k_{p n}=\sin \frac{n \alpha}{2}\) Now for breadth factor. Similarly, the strength of double butt joint welding is: P = (t_1 + t_2) l sigma_mathrm {t} P = (t1 + t2)lσt. Fin length (inches) CFM. The Slot pitch at gap surface for open slots lies between 15 to 25 mm. Pitch Factor) To reduce weight of copper, the stator winding is constructed with a coil width less than the pole-pitch. A 3 phase, 8 pole, 50 Hz star connected alternator has 72 coils in 72 slots. You can refere standarad input image shown in this calculator for you better understanding. Total diameter of the coil and winding is 515mm. Get Started. It must be noted that, in formula , the voltage equations of rotor side are the loop voltage equations; nevertheless, the. It is defined as the ratio of emf generated in short pitch coil to the emf generated in full pitch coil. 4×10 4. 4. e. It is expressed in terms of electrical space degree. Pole Pitch Formula Pdf If you ally dependence such a referred Pole Pitch Formula Pdf books that will meet the expense of you worth, get the unconditionally best seller from us currently from several. Pitch Factor is calculated by dividing the coil throw (–) 1 (coil span), by the number of slots per pole. Formula for Spring Pitch: (L – d) ÷ Na = p. I'm just looking for a simple expression formula for how maximum spring compression changes with free length of a coiled helical spring, say a Compression spring. As we discussed earlier that every set of windings in lap windings has no parallel paths equal to poles in a machine, so in duplex lap winding the current paths will be twice. This operation sets the spring to the required final free length. 2 Distribution Factor The ratio of the phasor sum of the emfs induced in all the coils distributed in a number of slots under one pole to the arithmetic sum of the emfs induced(or to the resultant of emfsWhen the coil length and diameter are known, the coil pitch (s) can be estimated by formula [17] in the Appendix. For the fundamental. Suppose the qualification for running and starting winding of 36 slots, 4 pole motor with running pitch 5-7-9 and starting pitch 8-10. These emfs must have same wave shape and be displaced by 1200 to each. The pitch is the distance from center to center of the wire in adjacent active coils. Each of these phasors is a chord of a circle. Steel Processing Portal WI Steel Connect. Length of the mean Turn: Length of the mean turn is calculated using an empirical formula l mt = 2L + 2. The inner and outer radius of the planar spiral coil is determined from the general equation of the filament of the wire. By Coil Diameter. of height to diameter ratios, and the topic of heat exchangers of varying ratios of coil pitch to its diameter. A regular winding will have a number (say m) coil elements, separated by electrical angle \(\ \gamma\). This paper presents a design formula for a printed spiral coil to ensure the maximum quality factor (Q-factor). μs 一 relative permeability of the magnetic core. machine are alternately north and south and their shape is described as being of salient-pole construction. When this is exactly equal to the distance between the centers of two adjacent poles, 180 electrical degrees, the coil is said to be full pitch and the winding a full -pitch winding. In a short pitch coil, the coil span will be (180 - α)° electrical (α = angle by which coils. Part 2 – Inductance Calculation Refinements. e. Irrespective the of poles at machine pole pitch is has value of one eighty degree. per Phase: Part 1In this video, I'll give you an idea how to derive the fundamental pitch factor (coil span f. The above recommendations assume that you have properly sized downspouts every 40 feet. 5 D or less is deemed to be an appropriate pitch. The higher the value is, the better the response is. 5. Helices are important in biology, as the DNA molecule. 8 and 1. Total coil length, L t =N*L 1. The Math / Science. CT Ratio = 400:1. m. What is pitch factor formula? Hence, pitch factor or coil span factor K p = Cos(ε/2. Calculate the dot pitch as the reciprocal of PPI: dot pitch = 1/160 in = 0. It is clear that the pitch of coils has a significant effect on the inductance parameters, especially the mutual inductance parameters, and the deviation increases as the electrical angle between two coils increases. D - coil diameter (cm); p - winding pitch (cm); d - wire diameter (cm). For example, if the large coil diameter equals 1. 1416, r is the coil radius, and p is the pitch. The induced emf in each coil side. After one turn (an angle increases by 2π), the distance increases by 2πk. It may be the full pitched or short pitch. Di = inner coil diameter . Winding factor is defined as the ratio of emf generated in short pitch distributed coil to the emf generated in a concentrated coil. Winding Pitch. Enter the coil diameter (form diameter + wire diameter - see diagram). What is coil pitch formula? Coil Pitch or Coil span It is the angular distance between two sides of a coil, measured in terms of armature slots. lt is also known as coil pitch. W = Length of Wire D = Diameter of Pipe L = Length of Pipe (and wire coil) T = Thickness of Wire ∏ = pi W = ∏(D+T/2)(L/T) This should give you what you need under ideal situations The length of the wire is equal to the length of one loop of wire around the tube, ∏(D+T/2), times the number of times it is able to go around the tube, (L/T). ; Coil Span: It is the angular distance between the two sides of the coil. The coil span of the alternator is 1 to 8. The sum of the back pitch and the front pitch is nearly equal to the pole pitch of the winding. Define Pitch Factor /Distribution Factor and present the formula to calculate. The formula is composed of a pattern’s metal thickness, single pattern width, total pattern width, and turn number, and is effective in the megahertz (MHz) frequency range. The resultant pitch Y r is always even, being the difference of two odd numbers Y r = 2 for simplex lap winding (4 and 6 for duplex and triplex respectively). Each aerodynamic force is a function of the following parameters: F = f n ( V ∞, ρ, α, μ, a ∞) Where: V ∞ = free-stream velocity ρ = density of the medium α = angle of attack μ = viscosity of the medium a ∞ = Free stream sonic speed. Pole pitchis defined as the peripheral distance between the center of two adjacent poles in a DC machine. The optimized results were found at the ratio of distance between the coil wire and tube wall to tube diameter = 0. DRILL: Using a standard drill 2. In the analysis, spacing values ranging between 0. Now, computing the wire lengths using 2pi x r and the. l——Spiral length. Hypothetical at the time, the coiled‐coil was proposed as a solution to the X‐ray fiber diffraction patterns of α‐keratin, which showed a strong reflection at 5. 0714 and Re = 19800 (Gunes et al. The formula for turns per volts is (1/ (4. 2. The formula for calculating the spring pitch is: SP = (L – 3 * D) / N. 2. 0][SA] Pitch (p) is the axial distance from the center of one coil to the center of the adjacent coil. Here, e = E 1 = E 2 = E coil and, if N is the number of active coils, izDN equals the length of wire, closely enough for practical uses. 10. First, using a semiempirical correction formula. 48 m Total length of coil 215. It is always less than unity so, Fig. Cubic feet per minute airflow. Since this machine has 8 poles and a pole-pitch of 48/8 = 6 slots, the coil pitch here is 5/6 = 0·833 p. Applicable Load InertiaSolution: To create a custom thread: Use the Coil command to create threads manually: Draw a coil with the desired settings, height, and pitch for example. K p = Cos (nε/2) Winding Factor. This type of coiling design offers a number of advantages, and a wide range of products depend on variable pitch springs to deliver optimal. When a coil is having a span of 180° electrical, it is called a full-pitch coil. Coil pitch is. The calculator is designed to accept the total line voltage and current of the combined three cables. Step 1: Analyse Motor. N is the number of turns in the coil. Divide the numerator with the denominator to obtain the inductance of the helical coil. To help better understand pitch and spring index, take a look at Figure 3 (a section view of a compression spring). c. In conventional three-phase electric machines, coil pitch ratio is usually selected around 5/6 so as to minimize the 5 th and 7 th flux linkage harmonics. It doesn’t take into consideration the pitch, or slant, of the wire. Let, E s = EMF induced in each coil side. The calculations discretize thecoil into a series of rings of current that take into account the diffusion of current or skin depth. I conclude that to eliminate 7th harmonic components of voltages in ac machine , coil pitch must be. You can then use the formula: R = V / I. ). In relation to pitch and length, calculate the number of turns that are required to make the helix 120 mm long if the pitch of a helical structure is 10 mm. If the span of the coil is reduced by an angle of electrical, then the coil span will be (180 − α) electrical degrees. The winding factor is often expressed as the product of three factors: the pitch factor (also called chording or coil-span factor), the distribution factor (also called breadth, spread or zone The calculation results of , , , , and for both double-layer windings with a constant coil pitch and single-layer windings with a constant odd coil pitch are all shown in Tables 9 and 10. The winding pitch cannot exceed the doubled wire diameter; The coil diameter cannot be greater than the doubled diameter of the rod; The winding length should be less than 3/4 length of the rod; When the coil is shifting it should not reach the edge of the core 1/8 of its length; The initial magnetic permeability of the rod should be greater. when carrying current, the field coils being unexcited. These are refered to as MASTER coils. . The operator only needs to enter this data and set the winding width stops. (v) For the number of phases, m, each repeatable group consists of m or 2m-phase belts. The formula for calculating the spring pitch is: SP = (L – 3 * D) / N. The resistance of 1 coil is 16,5 ohms. Pitch Factor or Coil Span Factor is definite as the ratio of emf generated in short pitch coil to the emf generated in full pitch coil. (iv) Coil-sides are inserted into slots in a single or double layer. 7 Distribution factor. Fine-tuning the compression stiffness of a coil by changing the pitch simply cannot be achieved by the way described in White et al 1 because the pitch did not appear in their definition of. If we need 1T at 250um, we would need 100A. It was the attempt of modern reanimation electrostatic model of the coil, that as shown in the case of formula Palermo, far from the reality. Sheared blanks rely on coil pitch as the remaining sizing element. 1 of the next coil than the pitch of the large coil will be 1. Height (H). The unit is kW/s. The one method that is given in both papers isFront Pitch. A Fractional Pitch winding is an armature winding made up of fractional pitch coils. if the winding would have been in one slot. In general, coils enclosing the same perimeter with similar shapes will have approximately the same inductance. This is a very simple calculator for estimating the inductance of a Single-Layer Air-Core inductor. The procedure consists of these basic operations: 1. 250 - 84) Thickness (0. predefined initial radius and coil pitch. The Coil Length Calculator is invaluable for engineers and designers when creating coils for various applications, including inductors in electronic circuits, electromagnets, and transformers. In varying the coil pitch to examine the behaviour of the coil resistance, the coil’s width and thickness are kept constant. Coil Pitch (p) is the pitch or seperating distance of the coil turns, it is normally maintain equaly through out the coil. Learn what terms like Pole Pitch, Coil Span, Commutator Pitch, Back Pitch, Front Pitch, and Resultant Pitch mean. Weaver’s article Numerical Methods for Inductance Calculation is used for calculations of. Corresponding analytical equations are given to present the design process of the VTP coils. Important points: Back pitch Y B the distance between the top and bottom coil sides of a coil measured around the back of armature is called back pitch. Calculations are typically done using the formula: Heating Coil Capacity (BTU/hr) = Flow Rate (GPM) x Temperature Rise (°F) x 500, with. INSTRUCTIONS: Choose units and enter the following: (H) Height (P) Pitch: distance between turns (D) Diameter Length of Helix (L): The calculator returns the length of the helix in meters. 5. Our proprietary, customer portal is cost-free and offers 24/7 access to a host of valuable tools to help you manage logistics and streamline production schedules. For the n th harmonic, the chording angle becomes nα° electrical. 5 mm . If the coil will be self-supporting you can use a bolt or a screw, wind the turns inside the grooves and remove the bolt by unscrewing it while holding the wire of the coil, this makes a very even and reproducible coil. This advancement is measured in terms of armature conductors and is called back pitch. 800-348-2529 Get a Quote. through formula nes = N 2 mbnwcc n lay, (6) where bnwccis the largest integer less than or equal to nwc. 1^3=1. Ends Ground or Not Ground: For closed coil springs, the ends can be ground or not ground. winding factor pitch factor distribution electrical4u web feb 24 2012 if all the coil sides of any one. In simple words for n-plex lap windings, the value of commutator pitch Yc is given as. Below is the coil length formula: L = π * Dc * N. If possible, it is easier to calculate the heat flux on the cold side as there is normally no phase change. Ultraflex Power free induction heating calculator tool is a powerful and easy-to-use online tool that can help you calculate and optimize your induction heating process. ∴ Pole Pitch = (Number of armature slots. 307 Mpx. induced in all the coils under one pole to the arithmetic sum of the induced e. f. After setting the coil ID, alloy, gauge, and width then alter the OD size to see the resulting coil. Counting the number of coils on a spring can be tricky. 1 Mechanical part. We can obtain the height of the coil with this expression: H = N * (S + Dw) Length (L). . if you are using Inches as units for your input. 5 m (5 ft), this mainly depends on the diameter of the tube and material of construction. A screw thread is a ridge wrapped around a cylinder or cone in the form of a helix, with the. Lip of the slot is taken 1. It has very good efficiency and low manufacture and maintain costs. . This will directly scale with current. 2) The emf developed in the winding is the directly proportional number of turns and independent of the pitch factor and distribution factor. What is the formula of pitch circle diameter? Tpi=1/p. If the number of coil span is equal to pole pitch, then the winding is called full pitch whereas no. The Pitch of coil spring formula is defined as the axial distance between adjacent coils in uncompressed state of spring and is represented as p = L f /(N t-1) or Pitch of Coil Spring = Free Length of Spring /(Total Number of Coils-1). helices) is a shape like a corkscrew or spiral staircase. Since it has a non-contact force and very low stiffness, it is widely used for precision positioning devices including magnetic levitation systems. 5 then round down to nearest inch Average wrap of coil is 78” long Then 30-20=10/2=5 5” is the thickness of coil 5/ thickness of steel . L = (Dc × N)² / (18 × Dc + 40 × Lw). So say all other aspects of the spring remain constant - coil pitch, inner outer and mean diameter, modulus of rigidity, elasticity, material, etc. Main Stator: Coils and Slots • The number of turns and cross section are specific to each frame size, slot combination or design, and voltage. There are different views regarding the pitch of coil springs. 29 degree. 50 x OD Vessel TL legth 3050 mm Limpet coil PCD 2700 mm Limpet coil OD 80 mm No. Select the suitable material. N = Speed of rotor in RPM. C machine having a total number slots S = 16. It starts calculating the. K = ZP/2πA = constant of the DC machine. Units: Outer Diameter (OD): Inner Diameter (ID): Mean Diameter (D): Load (P1): Height With Load (L1):Coil Pitch and Pitch Factor: The distance between the two sides of a coil is its coil pitch. ; When the coil is having a span of less than 180° electrical, it is known as a. The pitch factor of the coil at the nth harmonic frequency can be expressed as 1. Pitch factor. 3 τ p + 0.