# What is Windings: Definition and 33 Discussions

An electromagnetic coil is an electrical conductor such as a wire in the shape of a coil, spiral or helix. Electromagnetic coils are used in electrical engineering, in applications where electric currents interact with magnetic fields, in devices such as electric motors, generators, inductors, electromagnets, transformers, and sensor coils. Either an electric current is passed through the wire of the coil to generate a magnetic field, or conversely, an external time-varying magnetic field through the interior of the coil generates an EMF (voltage) in the conductor.
A current through any conductor creates a circular magnetic field around the conductor due to Ampere's law. The advantage of using the coil shape is that it increases the strength of the magnetic field produced by a given current. The magnetic fields generated by the separate turns of wire all pass through the center of the coil and add (superpose) to produce a strong field there. The more turns of wire, the stronger the field produced. Conversely, a changing external magnetic flux induces a voltage in a conductor such as a wire, due to Faraday's law of induction. The induced voltage can be increased by winding the wire into a coil because the field lines intersect the circuit multiple times.The direction of the magnetic field produced by a coil can be determined by the right hand grip rule. If the fingers of the right hand are wrapped around the magnetic core of a coil in the direction of conventional current through the wire, the thumb will point in the direction the magnetic field lines pass through the coil. The end of a magnetic core from which the field lines emerge is defined to be the North pole.
There are many different types of coils used in electric and electronic equipment.

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1. ### Induction motor windings, number of turns per phase and per pole

Hi, I have some question regarding windings on induction motors, if anybody can help. Reviewing some literature (*), the usual formulae to get the number of turns per phase of a induction motor winding is Eph= RMS phase voltage [V] Nph= number of turns of phase winding f= frequency [Hz]...
2. ### High voltage transformer windings position

Good morning all! I have a quick question regarding high voltage transformers, can someone explain why we need to put the low voltage winding the closest to the core and the high voltage winding on the "outside"? Have a nice day!
3. ### How to model "LITZ" or "STRANDED" coils and windings

In Simulation of transformer and electrical motors in software like ansys maxwell we usually have to model conductors, but does it matter how to draw them? I use Ansys software for finite element simulations. Maxwell, Simplorer, RMXpert and other toolboxes. but I always have a doubt on how to...
4. ### How to wind a brushless motor (number of windings per stator)

Hi folks, I'm searching for information/procedure and also calculations/equations on how to correctly wind a stator on a (general or DC 3-phase) brushless motor? I.e. how to wind a copper wire X number of times around the stators, and thus get the desired performance/force that is required...
5. ### Modifying generator windings to convert output from 220V to 55V.

Sirs, I have two honda clone 2.5KW/220VAC gasoline generators, one with AVR and another with Capacitor excitation. I want to modify alternator windings of one of them so that it can directly output around 55VAC which shall then be rectified and use it to charge 48V batteries. I have fair...
6. ### Minimum voltage supplied to motor windings

I have seen the following specifications in the Hurst motor data sheet. i have confusion on the Minimum DC voltage to the motor windings. It says as 10Vdc, but even if i give less than 10V it should not damage the motor windings. I can understand the upper voltage if i cross it may damage the...
7. ### Transformer without separate primary and secondary windings....

I have always longed to make a system where I can get AC over a wide range of voltages. This system would help me test how my other experiments behave when they are powered from the mains. In order to get different voltages, I need to design my own transformer where the secondary has been tapped...
8. ### Electrical Snow blower motor -- why two windings?

I have my field windings on the bench and it has a heavy and light wire wound in pareral there are three wires off the field windings . It looks like to me after testing switch with ohm metter positive turns on motor but when switch is in on position green wire off switch is not connected to...
9. ### Winding a toroid inductor, is this calculation correct?

Hi, I am going to wind an tapped toroid inductor for a LCR circuit in an equalizer. I have calculated the number of turns I need for each winding. This is my first time winding an inductor so I need to get some things straight. What to do with the 10 kHz tap, should I twist a wire with the 12...
10. ### Experimenting with Windings: Maximum Voltage Output?

I attach an image of something I am experimenting with. The picture itself (and added text) should be self-explanatory. 1) Which way should my windings (clockwise or counter-clockwise) go around P1; P2; P3 & P4 for maximum voltage (V) ? [ 1 Ø ] [ 1 x single enamelled copper conductor ] [...
11. ### Testing Windings: Tools & Gear for Appliance Repair

I get given a lot of brush-motor tools that are "burning', as well as assorted other damaged electrical items. I'm not an electrical engineer, just a fiddler with some background in physics. Now, Jim Hardy and Tom.G have just walked me through testing a 12V alternator, which was found, as far...
12. ### Exploring BLDC Motor Windings & Efficiency

I learned that brushless DC motor windings have an algorithm for winding depending on several variables... When I google image search BLDC stator, I expect to see this : But I see a lot more of this : Is this second one still a brushless DC? If so, do they just lose efficiency by winding...
13. ### Neat windings vs sloppy windings for Solenoid Actuator?

Hello, I am a hobby machinist and also an EE PhD student. Recently I have been trying to make powerful solenoid actuators. I have succeeded, but they aren't perfect. I really want to make a professional, powerful solenoid. To give a sense of how deep I am going, here is what I have found so...
14. ### EMF Pinewood Derby: A Practical Physics Project

I'm taking physics 2 and was told to create a practical project utilizing electromagnetic force. Starting thinking about Lenz's law (which I just read in a textbook for the first time a week ago) and I thought it would be fun to send a pinewood derby car uphill instead of down. The sprinkler...
15. ### Do increased windings conflict with thicker coil diameter?

I have read that to increase motor magnetism that an increase in the windings increases the number of tiny magnets that can be used to provide the magnetic force. I have also read that increasing the cross section of the rotor increases the efficiency. Finally I have read that increasing the...
16. ### Replaceable alternator rotor windings

Has anyone ever heard of a rotor winding that can be interchanged with different shaft lengths? I'm trying to find a way to create a 3-phase alternator with a through shaft to attach pulleys on each end.
17. ### What is the induced emf in one of the windings?

1. A solenoid of length 3.64 cm and diameter 0.914 cm is wound with 170 turns per cm. If the current is decreasing at a rate of 36.3 A/s, what is the induced emf in one of the windings? this is what I did: Length of the solenoid l = 3.64cm = (3.64...
18. ### Inductor Basics: 2 Windings or More?

The other day one of our power labs we were using rather large inductors; that is, approximately 10"x4" in the shape of a doughnut. There were 4 connections into the inductor. We connected a wire from one to the other, and then used the other two connections as any other inductor. Does that...
19. ### Calculating EMF in Windings of a Cylinder (60cm x 5cm) for 6mV

How many windings you have to reel up on a cylinder (length is 60cm and the diameter is 5cm) so that a Emf of 6mV gets induced if ΔI/Δt=1A/s? This is not my homework. I was doing this as a preparation. I know the formula: ε=-L*ΔI/Δt L is unknown. How to relate it to the windings, the length...
20. ### Bigger copper windings make electric motor faster?

I want to use some motors i had laying around to do a project. A flick of the shaft measures 5MA. I want to rewind the motor so it produces 10ma. do I use bigger wire, or the same size wire just more of? less of or will I just have to
21. ### Insulated brushless motor windings

Hi, I've never done Physics before (bad choice I know :P) so forgive the question if it seems a bit noob. Do the windings in a brushless motor have to physically be in contact with the magnets in the stator? That is, can the windings be insulated? Thanks Jamie
22. ### AC and DC Windings: Understanding the Difference

what is meaning of ac winding and dc winding?how it differs from each other? advanced thanks.
23. ### Transformer windings and voltage

A transformer is constructed with 200 windings on the primary coil, and 800 windings on the secondary coil. The primary coil is connected to a car battery with a potential difference of 12 V. After a few seconds, what is the voltage across the secondary coil? The answer is 0, but why? I...
24. ### The current of primary and secondary windings

So I was just reading about transformers from my textbook, and the textbook seems to state that when the resistance on the secondary winding circuit is infinite and no current runs through it thus the power on it P=VI is zero, then, according to the energy conservation law, no current runs...
25. ### Understanding the Role of Winding and Conductors in Electrical Circuits

when conductors are wound, they touch each other. why would the current flow through the spiral path when they can just jump on the next wire??
26. ### How many windings needed to generate Peak emf

Homework Statement A simple generator has a coil with dimensions 1.0 cm x 1.0 cm which is rotated at 60 Hz in 1.0 T magnetic field. How many windings (turns of wire) are needed to generate a peak emf of 120 Volts ? Homework Equations 1. emf E = - d (magnetic flux) / dt 2. magnetic flux = (B...
27. ### Replacing Aluminium windings for Motors with copper wires

Good Day, I have defective Aluminium windings motor. As you know Aluminium is very difficult to winding. So, I want to use Copper wire to re-winding the motor. How can I do that? What size should I use and what will be the number of turns? Someone told me that you can use...
28. ### How are BLAC motors wound and what makes them different from BLDC motors?

Hello, I've recently read a couple of things about brushless motors that have spurred quite a few questions. Googling has solved some of them, but I'm hoping that you can help with the rest :smile: Apparently there are two types of permanent magnet brushless motors - DC and AC. This is...
29. ### How can strings have multiple windings?

Hello all. I am currently reading 'The Elegant Universe' and I'm puzzled by one key thing that is really starting to 'niggle' me! How can a one-dimensional string have multiple windings along a two-dimensional circular spatial dimension ("Garden Hose"). For this to be possible the string...
30. ### Ferromagnetic Windings in Electric Motors: Can They Operate?

Can the wire windings in an electric motor be ferromagnetic and still operate? Why?
31. ### Emf induced in the windings of coil

Homework Statement a tightly wound circular coil has 36.8 turns, each of radius .1m. the uniform magnetic field is in a direction perpendicular to the plane of the coil. the field increased linearly from 0 to .42t in a time of .251s. what is the emf induced in the windings of the coil...
32. ### Connecting the primary and secondary windings of transformer in series

What happens if you connect the following in this order: 1) from a battery to the primary in 2) from the primary out to the secondary in 3) from the secondary out to a motor 4) from the motor to the battery I know that transformers usually step up or step down the voltage, but it shouldn't be...
33. ### Number of windings for 120-V household circuit?

A model train requires 6 V to operate. If the primary coil of its transformer has 240 windings, how many windings should the secondary have if the primary is connected to a 120-V household circuit? V1/V2 = N1/N2 my teacher went over this with the class, and said that N2=...