Winding Definition and 99 Threads

Homework Statement I have a sphere that I want to travel from the north pole to the south pole. The route I take is winding around the sphere (instead of the obvious shortest path). My path is dictated by: ##\phi(t)=wt## ##z(t)=R-v_z t## in the negative z direction per N to S The form...

Hi, If there are no resistance and impedance parameters given for a single phase transformer, is it possible to work out the values of primary and secondary winding inductance and resistance (r1,r2,re1, x1,x2,xe1 etc) without the use of a short circuit test. The transformer can be tested...

Hi guys, I am building an electromagnet to use mainly for its reaching properties. I want to have a large air gap. I don't care if the magnet can only lift a paper clip but I do care if it can move it from a 15 to 20 cm distance or more. I only have 1 core to work with so my choices are only...

Find the work done in winding up a 300ft cable that weighs 2.00 lb /ft W=Fd W=$$\int F dx$$ My attempt w=F*D so W= (300ft)(2.00lb/ft) W=600ft.lb and $$\int_0^{300}\!\ 2xdx$$ W=90,000 ft.lb I'm taking Calc 2 and this is applied Physics problems...

I am hoping to get some guidance in this thread from those who have traveled the path before me. For the past couple of years I have been on a tear to educate myself in mathematical physics for a variety of reasons I won't bore you with here (some personal, some professional). In any case, to...

I have been reading about coil design and I have a question. Is there any specific reason a coil design should utilize the entire winding area? I keep reading about this in different literature but none of the literate i have read explains why.

transformers -- winding resistance and leakage reactance Does anyone know what is meant by: 'determine the combined winding resistance and leakage reactance referred to the primary side'?

In a 3 phase slip ring Induction motor, 3 phase balanced supply is given to rotor winding & stator winding is short circuited . Then rotor would - run against the direction of rotating field. Can anyone explain this phenomenon?

I am designing a small step up transformer and I'm trying to calculate leakage inductance and winding capacitance. The problem I'm having is when I search the web I find there is a ton of info on the subject. So I have no idea where to start. Can anyone explain to me how to calculate...

Hi. I am wondering how I can diagnose a winding and find out whether it is damaged. Windings like for solenoids or electromagnets operating on 12VDC. Or even for 12V motors. I want to know how I can detect a turn to turn shorted winding. Does an electromagnet lose magnetic power and...

Homework Statement A cycler is going through the winding, cycling on a circle of radius 6m and is slanting with alpha=75^ to the horizontal surface. What's his velocity? Homework Equations T=\frac{mv^{2}}{R} Fc=\mu F_{N} The Attempt at a Solution We have two forces on the cycler...

Is the Milky Way winding up like spaghetti on a fork, or spinning out like frosting in a blender?

Hello All, Greetings. I am new to this forum. I am working for a heater project, in which we use plastic (PA66) over molded on aluminum (6061-T6) body for melting corrosive liquids (similar to sea water). The Aluminum body is heated by means of Positive temperature coefficient material (PTC)...

Does anybody know if exist a kind of Insulation Monitoring Relay, to be Online (energized) all the time and be able to monitor the Transformers and Motors Winding continuously?

Consider a biresonant transformer with a small coupling coefficient k << 1. Let the voltage applied to the primary LC circuit be U1(t)=U*sin(2*Pi*f*t), then also the current I1 will be sinusoidal. The voltage induced in the secondary winding and the current in the secondary LC circuit will be a...

I am winding a transformer. I want to get it done right the first time. The transformer has a square core with a coils on opposite legs. I want the polarity to be the same on each coil so how do I wind them? Should the start of the windings be at the top of each coil? Should the...

I have a generator. Single phase 220 volt A.C output Frequency 50 Hz 2000 kVA Rotor winding of my generator was burnt. It was rewinded but it burnt again after 1 day. There are 2 types of windings in stator one main winding which gives 220 volt A.C output and 2nd is excitation winding...

I am trying to prove the following result: Fix a,b \in \mathbb{R} with a \neq 0. Let L = \{(x,y) \in \mathbb{R}^2:ax+by = 0\} and let \pi:\mathbb{R}^2 \rightarrow \mathbb{T}^2 be the canonical projection map. If \frac{b}{a} \notin \mathbb{Q}, then \pi(L) (with the subspace topology) is not a...

So the in the equation for the winding number/index of a curve I(\gamma, z) = \frac{1}{2i\pi} \int\gamma \frac{1}{ζ-z}dζ where \gamma : [a, b] → ℂ and z is an arbitrary point not on \gamma, what exactly does ζ represent?

Homework Statement Let D ⊂ C be open, connected, and bounded. Suppose the boundary of D consists of a finite number of piecewise differentiable simple closed curves: α0,...,αN, with α1,...,αN contained in the interior of α0. Suppose α0 is oriented in the positive direction and α1, . . . , αN...

Let $f$ be analytic on an open set $U$, let $z_0\in U$, and let $f'(z_0)\neq 0$. Show that $$ \frac{2\pi i}{f'(z_0)}=\int_C\frac{1}{f(z)-f(z_0)}dz, $$ where $C$ is some circle centered at $z_0$. If I re-write the above expression, it is saying the winding number is 1, correct? I am not sure...

Hi guys, I ran a large DC motor and a small DC motor for 5 minutes at max voltage/max speed. Took the readings for before running it and after running it and somehow the smaller motor after five minutes of running at max volt/max speed has more than twice the winding resistance where as the...

Hello everyone I have a quick question on how to wind overlapping layers of magnet wire around a coil form. How do you layer coil turns for a coil? Do you just start at the top of the coil form and then coil over the top of the previous coil in the same direction and then just twist the two...

Hello, I am rewinding the armature for a burned up winch motor. This tutorial ( http://scootersupport.com/motorrewind.htm ) shows basically the exact same motor (but for scooters). The picture shows the armature. My question is, please help me to understand- each coil around the armature...

First post! :) I am building a Geiger counter with this circuit: http://www.pocketmagic.net/wp-content/uploads/2011/03/geiger-simple-1b.jpg in the blog the author used a regular EI transformer from a power supply, but I tried disassembling them and broke the ferrite core 4 time now, so I...

If a transformer has a bifilar wound primary coil will the secondary voltage still be equal to the transformer's turns ratio? Bifilar coils when connected together in the proper way have a much higher voltage between turns. Instead of the voltage across each turn being equal to the total...

Hi, What if the inductor coil is wound one way rather than the other. Then the circular flow of current will be clockwise in one case and anticlockwise in the other. And if the inductor is connected to an ac source, then the current will vary. Now in both the orientations, the variation...

Motor winding problem please help me..? if I got a armeture of a motor without a coil and ask to wind the coil what should I know to do this and how to know whether, * it is a AC/DC motor * what gage of coil it should be * what is the ampere and voltage * how many turns should i...

The answers will probably be "it ain't as simple as that" but here's trying, anyway. 1. Is current thinking that strings have to wind "around" something? If so, must the compactified space have at least one hole? 2. With just a single hole, presumably there can be just one topologically...

Hi, everyone: I am confused about the def. of winding number of a loop on S^1 ( on elements of Pi_1(S^1,1) ). The winding number is defined by w(f):= [log(f)1)-log(f)0)]/i2Pi One of the problems is that log cannot be defined continuously on S^1, since complex logs can only be...

I got a few questions about transformers.. I understand there is a primary winding and secondary winding wraped around a iron core. Now for the primary connection - take 7.2kv 1 phase line and connect it to one side of the winding and take ground (earth) to the other winding end. On the...

hi guys Do you know a way of identifying the winding that has multiple taps? Do you know some material on internet that explain this better?

Hello, Im trying to learn about string theory in toroidal compactification on an undergraduate level. I am mostly using Zwiebach's "A first course in string Theory" but now I am trying to do something that doesn't seem to be covered in the book or any other literature explicitly. Perhaps...

We know the winding number as a curve winds round a point.If a point is inside a closed curve,then the winding number is 1,this is the geometrical intuition. The definition of winding number of closed curve gamma with respect to a is n(\gamma ,a) = \frac{1}{{2\pi i}}\int\limits_\gamma...

I was hoping someone could help me understanding winding numbers For e.g. the point -i that is (0,-1) on this curve... I was trying to determine if the winding number was 2 or 3 http://img15.imageshack.us/img15/1668/11111111111111countour.jpg

Just out of curiosity : Consider a transformer with winding ratio of 1 : 10. What happens when AC 120 v is applied on primary and on secondary we apply DC voltage of 120 v from a battery source is series or in parallel? What will be the output in both cases?

Hello all, I have a simple question about copper windings on generators. From what I have read, magnetism only penetrates the skin of a copper wire by very little. Dosnt this mean that most of the copper in a winding is wasted ? And wouldn't it be more efficient to use flat wire "-"...

Hello friends friends, which material generator coil is made and are they insulated of current but not magnat flux or can we use same wire which is used in electrical motors winding, Q:which is low cost and best material winding for generator? thanx

I am trying to duplicate an already existing inductor by buying the components and winding it myself. I have found several different sources that give me different equations for determining inductance. My questions are as follow: - What is the governing equation for determining the inductance...

Motor: Delco - 1/4 HP - 5.3A - 1735 RPM - single-phase AC; 32 slots - 4 poles - I have run into conflicting terminology, so I apologize for any confusion - Each of the four poles in this motor's stator core contains three coils with two empty slots at the center for a total of eight slots...

This is a question about brushless DC motors. (I should have put that in the title) How do you compare the two for an single geared vehicle drive system to get the widest power band in the same package size? I've been looking over the max flux density of soft iron vs. neodymium permanent...

There is an overhead door at work that will start to open but then stops. I don't know all the details because I haven't been out to the door yet, but the information has been given to me by one of my guys. The door is driven by a 3-phase 480 volt motor. I don't know anymore information...

Hey, anybody out there good with electrical stuff?? I'm no genius but can I be correct in assuming the following? Im making high voltage electromagnets. If I use 1200 winds of awg30 magnet wire, it will have the same power ~ (EMF) Or (magnetic field strenghth) as 600 winds of awg15 magnet...

Can anybody explain what is meant by winding modes of excitation? How do such states contribute to total energy? For example, in the case of a scalar field in 2 dimensional toroidal space, how to calculate these?

I have some questions about this proof. I have numbered the equations (1), (2), ... so I can ask about them. THEOREM If the piecewise differentiable closed curve \gamma does not pass through the point a then: (1) \displaystyle\oint_{\gamma}\frac{dz}{z-a} is s multiple of 2 \pi i...

This problem is in a GRE exam which I think might have big mistake in forming the answers: A thin uniform steel chain is 10 meters long with a mass density of 2 kg per meter. One end of the chain is attached to a horizontal axle having a radius that is small compared to the length of the...

I play around with HO slot cars and would like to wind my own "hot" armatures but I can't find any sources of direction. It seems like everyone knows how to do it so why explain:frown: I've bought a couple of pounds of mag wire in different guages but I would hate to tear up a good one to...

Hey Everyone, I recently got a hold of a coupe of toroidal cores that I want to wind some wire on (see pic). They are roughly 2.5" OD, 1" ID, 1" thk. I plan to wind two coils of 20 gauge magnet wire onto them but I was wondering if anyone here knows how the factory-made ones are wound? Do...

Why do mountain roads rarely go straight up the slope but wind up gradually?