Aug 19, 2020 · Working Turns: Another important factor is the number of "working turns" in each coil, a measurement of how tightly the coil is wound. Coils constructed with a higher number of working turns will result in both a softer and more durable mattress, since the work of supporting your body is spread throughout the spring. Working turns can be ... turns = number of turns on the coil area = the cross sectional area of the core in square meters*, including some of the coil as shown in the diagram length = length of the coil in meters* * The inductance calculator below also takes inches, as well as centimeters and millimeters, and does the conversion to meters for you. In designing and constructing the coil it becomes necessary to estimate the cross sectional area, and resistance of the coil. This calculator estimates the physical properties of a coil such as resistance, total length of wire needed and number of windings, give the wire diameter, and bobbin length. If the primary has the same number of turns as the secondary, the outgoing voltage will be the same as what comes in. This is the case for an isolation transformer. In certain cases, one large coil of wire can serve as both primary and secondary. This is the case with a variable auto-transformers. Pitch is the distance between the center of one turn and the next. Np is the coil length. The calculator below uses the second formula. The first is attributed to Wheeler; the second a slight adaptation. The reset example shown is for a coil with L = 250 uH, radius of 1.75 inches, with 61 turns, and winding spacing of 0.05 inches. There are 3200 turns on the primary coil. €€€€€€€€€ Use the equation in the box to calculate the number of turns on the transformer’s secondary coil. € €€€€€€€€€ Show clearly how you work out your answer. ..... ..... Number of turns = ..... (2) (Total 7 marks) € € Apr 07, 2020 · This frequency is represented by the symbol ƒ, and is measured in Hertz (Hz). The full formula for calculating inductive reactance is X L = 2πƒL, where L is the inductance measured in Henries (H). The inductance L depends on the characteristics of the inductor, such as the number of its coils. Using the wire tables, compute the number of turns per layer (being sure to use the diameter of the wire WITH insulation), leaving a margin at the end of the coil former of about 1/16" to 1/8" depending on wire sizes, with the bigger wires having the bigger margins. Use the average radius of the coils, the number of turns of wire in the coils, and the current that you recorded in steps 10, 11, and 12 to calculate the magnitude of the magnetic field for each case of circular motion of the electron beam. The purpose of the calculator is to determine the number of turns required for the helical primary coil. Enter the target inductance in microhenries, the coil radius and height. Click on Calculate to get the results. A sample inductance of 50 uH, a radius of 6 inches and a height of 9 inches yield 14.142135623730951 (about 14) turns required ... I have many times given the ROUGH "starting" point:- Capacitance(pf) = Wavelength in meters Coil (turns) = Wavelength in meters Naturally the size of the coil former you use will affect the turns needed for a particular frequency, so this "starting" point is very rough and is only intended to get you in the right vicinity. N = the number of turns r = outside radius of the coil in inches . EXAMPLE. I want a coil to have 20uH inductance in an HF PA valve anode for 30 MHz. I shall use a toilet roll tube for a former (2 inches in diameter). I will space the coil out so that the winding length is one inch. To concentrate the magnetic field, in an electromagnet the wire is wound into a coil with many turns of wire lying side by side. The magnetic field of all the turns of wire passes through the center of the coil, creating a strong magnetic field there. A coil forming the shape of a straight tube (a helix) is called a solenoid. As Jack said, speed comes from turns. Changing turns is simply a ratio of what you have to what you want. 2000/2500 = .8 .8 x 20 turns = 16 turns of .7mm wire (.7 dia. comes from: 1.25 x the area of .6mm wire, 1.25 is the inverse of .8) The formula used for calculating the total number of turns is N=V/(( Te*A)/ S)) where V= desired output voltage, Te= (magnet gauss*.5)/10000, A= magnet area in square meters and S= 60/rotor RPM. Lastly, N is divided by the number of coils to determine the number of turns per coil. This question is on transformers. This is clear because there is a primary and secondary coil and a different voltage between the 2 coils. Transformers induce a changing voltage in a coil. The known equation for finding the number of coils is: primary voltage / secondary voltage = turns on primary / turns on secondary. summing over the ith turn from the Tx coil and the jth turn from the Rx coil, the mutual inductance Mbetween two multi-turn spiral coils is simpliﬁed to M= NX TX i =1 NX RX j oR iR j Z ˇ 0 cos()d q R i 2 + j 2 d2 2 i jcos() (8) where dis the separation distance between the Tx and Rx coils, R i and R j are the corresponding radii of each turn for Jun 16, 2018 · A transformer for a distribution line receives 2V ac and step up to 240V ac. The secondary contains 300 turns and draws 10 A. Calculate; 1). The number of turns in the primary coil? 2). EEWeb have a free online Coil Inductance Calculator for calculating the inductance of a coil for different configurations of wire size and positioning. As well as increasing the number of coil turns, we can also increase inductance by increasing the coils diameter or making the core longer. It’s also possible to step-up voltages by increasing the number of turns on the secondary side if we need a higher voltage. Primary Secondary 240 volts 4 turns 480 volts 8 turns Notice that we can determine transformer ratio by either: (1) counting the number of turns on either side, or (2) by determining voltage on either side. We Using the turns ratio formulae we can calculate the secondary voltage as: Va = (Na / Np) * Vp Vb = (Nb / Np) * Vp Where, Va = Voltage across the first half of Secondary coil Vb = Voltage across the second half of Secondary coil Vp = Voltage across the Primary coil Na = Number of turn in the first half of Secondary coil Nb = Number of turn in ...