Questions tagged [winding]

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8
votes
3answers
1k views

If you have two identical but oppositely wound inductors does the inductance effectively cancel?

I was just curious if the effect inductance of a branch of a circuit would cancel if you put two identical but oppositely wound inductors in series. It's not something I have come across.But looking ...
7
votes
2answers
2k views

Designing/Predicting Output from Permanent Magnet Motorcycle Stators

I'm hoping you can help me. I've long been into motorcycles, and have restored and customized many different bikes. While building custom motorcycles, I often add electrical accessories, and use high ...
6
votes
2answers
6k views

Manual transformer winding - dots convention

I've already seen this and this. But I can't decide how to correctly wind a SMPS transformer. This is the transformer: I mantain the same turns direction (CCW if you look at transformer from the top)....
6
votes
2answers
7k views

What is meant by front and back pitch of an armature winding?

I searched the internet for these definitions and found a common definition in all websites: Back Pitch- A coil advances on the back of the armature. This advancement is measured in terms of ...
6
votes
1answer
2k views

Winding method for barrel wound secondary center-taped EE core

I'm designing a high-frequency transformer, EE type core, with one primary, and a center tapped secondary. As the secondary current is relatively high and the window area is small, I will use copper ...
6
votes
3answers
204 views

Why so much space around these toroid windings?

I have recently noticed some toroids wound with what I consider to be huge space left over, and I am asking if there is any good reason to do this. (or even an acceptable reason would do). My thoughts ...
5
votes
2answers
5k views

How to properly wind a high frequency / high voltage transformer?

Please, is there any practical tip / caveat I should be aware, when winding a high-frequency transformer? I'm used to wind 50/60Hz transformers and they do work ok, but now I'm trying to make a high ...
5
votes
2answers
1k views

converting induction motor winding to reluctance motor winding

I want to build simple reluctance motor for education purpose. I have couple of small 3 Phase AC Induction motor with 24 slot stator lap winded for 4 pole design. I want to convert it to reluctance ...
5
votes
0answers
71 views

Why duplex lap winding has twice as many current paths as simplex lap winding?

I found the statement of question on page 346 in the book "Electric Machinery Fundamentals, fifth edition" written by Stephen J. Chapman. When I searched for how duplex lap winding looks ...
4
votes
0answers
109 views

Inductor design

I really need your help on this. I am designing an inductor which is rated for 50 A and 350 Vrms for 85 kHz. I want to get 3 inductance value from one inductor so I decided to tap between the points ...
3
votes
3answers
4k views

Transformer: Double primary winding?

I found the picture below on the Internet about a double primary winding transformer. I understand how a simple primary double secondary winding transformer works, but I don't see the point in making ...
3
votes
2answers
107 views

How frequency-dependent is an air inductance?

For a winding on a magnetic material, the value of the inductance is greatly impacted and is also frequency-dependent given the behavior of the magnetic material according to frequency. My question is,...
3
votes
2answers
174 views

Behaviour of flux in DC motor

In given figure if we assume both sides (up and down) with equal number of coil turns (N each). And we wound(which generally we do in DC motor) coils such that they create flux and form a North-South ...
3
votes
1answer
89 views

Is there any way to wind this 4 pole motor to behave as 2 or 8 poles properly?

I got an induction motor in a junkyard, a WEG motor made for an Electrolux washing machine. It is a single-phase 1/2 hp 4 pole motor. It runs in 127 V and has a 40 uf capacitor feeding the auxiliary ...
3
votes
0answers
203 views

What is the purpose of this transformer winding in the following SMPS schematic? [duplicate]

I am trying to understand how the following PC switched mode power supply works : The way it works in general is OK. What is not clear to me is what is the purpose of the following part in red : ...
3
votes
1answer
451 views

Why doesn't the winding coil burn

In the specifications of a 10 KW BLDC motor I've seen Motor Wire ------ 2 - Strand 1.9mm Max Continuous Current ----- 200 Amps Max Continuous Power ----- 10000 Watts The details are as follows,...
2
votes
1answer
11k views

Why don't the currents clash in a 3 phase delta connection?

Consider 3 windings, a, b and c. L1 is connected to A, L2 to B and L3 to C. The 3 windings are then connected in delta. If we could freeze frame the voltage waveform where L1 and L2 are positive ...
2
votes
2answers
67 views

Is there any good way to limit primary current on a low inductance transformer?

For a while, I used hand wind transformers to make high voltage (250v, then several stages of cockroft walton to 750-1000v) from ~12-24v at around 10khz and max 100ma on the primary side. But of ...
2
votes
3answers
136 views

Current transformer energy harvesting from a mid-voltage line

I'm planning on harvesting energy from a 33kV line which has an average 10rms A current. The main conductor (N1) has a overall diameter of about 13mm.In the beginning I tried to harvest around 3-4 W ...
2
votes
1answer
168 views

Which is the physical insight behind the widely approved 'space vector' notation used in the analysis of the dynamic model of electric machines?

When approaching the study of electric machines in transient condition, it is customary to discard the real physical vector quantities like magnetic field and magnetic induction and to define fake ...
2
votes
1answer
3k views

AC Machine Stator Winding

In designing a 3 Phase, 4 Pole, 24 Slot AC machine assuming a RYB phase sequence i am confused on the starting point of the blue phase. The calculations, table and diagram look like the following. ...
2
votes
2answers
20k views

Wiring up a 4 pin DVD drive stepper motor?

I have removed a stepper motor from a DVD drive which looks like the following: http://forums.parallax.com/attachment.php?attachmentid=102789&d=1373845076 As seen, there are 4 pins in a ...
2
votes
1answer
491 views

Winding a custom transformer with coil former

For a project I'm building a DC/DC convertor for converting 600VDC to 5VDC. Through the use of the TI Webench I was able to create a design, but it requires a custom wound transformer. The transformer ...
2
votes
1answer
189 views

Coil winding sense in dual voltage power supply

Hello is the sense of the B winding in the transformer (same as A or opposite than A) can have any effect on the powered circuit? Maybe due to the fact that the AC ripple of the negative rail is out ...
2
votes
1answer
104 views

Electric grid power transformer winding: If it is milliohms, why does 9V DMM show infinite ohms?

When testing large MVA power transformers, like 66kV to 16kV, the winding resistance in DC ohms is milliohms. It takes a high current supply to do this, then the V is measured across the winding to ...
2
votes
0answers
93 views

What kind of monophasic induction motor is this?

About 15 Years ago I bought an induction motor from a junk yard. It have 6 leads being that 2 are the same lead, so 5. The guy who sold me had no idea from what machine it came. And I don't quite ...
2
votes
1answer
285 views

BLDC controller

I have to design a controller for three phase BLDC motor. In BLDC motor, for each hall sensor signal combination we have to to energize two sets of stator phases. But how to correctly identify which ...
2
votes
1answer
170 views

Would you help me understand the design of this induction motor?

I need to understand the design of a single phase induction motor (I think it is a permanent split capacitor motor). The motor works on three different speeds. It has 8 poles as shown in figure. ...
1
vote
4answers
1k views

230 and 240 transformer leads

So I have a transformer that is like 230 || 30 V. One thing I don't get that on primary side it has the following leads: 0 --- 230V --- 240V When it can be useful? I mean I can't think of situation ...
1
vote
1answer
148 views

Determining an industrial electromagnet coil's number of turns and wire diameter, etc

I'm a new graduate and fresh hired Electrical Engineer who works in a company building magnetic separators for general industry (including mining, recycling etc.) Normally, we build magnetic ...
1
vote
2answers
432 views

Which winding is the auxillary winding in a permanent split capacitor motor?

I have an induction motor, I'm very sure its a permanent split capacitor motor. One winding is 16 ohms, the other is 4 ohms. I have seen that the higher resistance winding, the 16 ohm one, is the ...
1
vote
1answer
1k views

DC motor armature rewinding

Question about rewinding a brushed DC motor: I've taken apart a DeWalt router to see why I was getting so much sparking (already tried replacing brushes). While testing the resistance between ...
1
vote
2answers
40 views

Is there any effect on efficiency of electromagnet if winding wire cross each other during winding?

While winding a core of the transformer some turns cross other turns. Will this affect the magnetization produced by the core?
1
vote
1answer
147 views

What is this symbol on a schematic for an old milling machine?

On the schematic below, I'm having trouble identifying what the symbol drawn on top of motors 2 and 3 means. I've never seen anything like it. They're only present on the high-power spindle and feed ...
1
vote
2answers
3k views

How to calculate secondary winding max current output?

I have removed a UPS transformer. It is a Class B Viking transformer. Its primary side has 4 wires coloured black, green, blue and yellow. I found resistance as follows- 1. Black to Green - 17 ohm 2. ...
1
vote
2answers
820 views

Questions about SMPS Toroid winding

I'm making a simple SMPS to create multiple isolated outputs to audio effects circuits. I need to make a toroid pulse transformer which has one primary and at least 10 secondaries. These secondaries ...
1
vote
1answer
1k views

Series Connected Secondary Transformer

I have a multiple-winding transformer with the following configuration: primary: 230V secondary: 2x 10-12-15V frequency: 50Hz power : 66VA current: 2x 2.2A As far as I can understand from its specs ...
1
vote
1answer
85 views

Measuring turn ratio of a transformer

I've taken out a beafy transformer with 8 leads from PCB of a multimedia device of some sort. (Possibly a TV). 2 leads are obviously the primary coil (thicker leads and wires) the rest are almost same ...
1
vote
2answers
69 views

Why does an additional primary current exist in a loaded transformer?

I think this has something to do with Faraday's Law but like, I don't get why having a secondary current produces a antiphase secondary current at the same instant. Not all currents produce a direct ...
1
vote
1answer
55 views

Winding arrangement in small toroidal mains isolation transformer

I got a 0.3A 220/220 toroidal transformer with the primary (red wires) on the outside and the secondary (black wires) on the inside. What is the reasoning behind this arrangement in this particular ...
1
vote
2answers
28k views

Calculating resistance and reactance of an coil (motor winding)

I want to find out the resistance and the reactance of an motor coil. I can measure the magnitude of the current through the coil using a DMM. For example, If the voltage across the coil is 230v ac ...
1
vote
1answer
7k views

Coil Winding Sense of Inductor/Transformers and Output Polarity

Given a solenoidal coil, if it is wound in one sense (say clockwise), would the output from it, in terms of polarity, be equivalent to another coil, wound in the opposite sense (counter-clockwise), ...
1
vote
2answers
349 views

Three phase transformer windings

I have a quick question about three phase transformer windings. if I have a transformer that is Yd11 but I connect the generator to the d-side instead(primary side). Does it become Dy11 connected or ...
1
vote
1answer
31 views

In a transformer, how do you determine where the induced EMFs (E) and voltages (V) are placed in a vector diagram?

I will be citing pictures from Electrical Technology by Theraja. So there are different cases with regards to the transformer depending on what losses and loads are considered. Each of them have ...
1
vote
1answer
112 views

How ignition coil in automobile works..?? what are the winding count for ignition coil..?

I just want to make ignition coil on my own. can you please help to done primary and secondary winding for same..? 40KV output required from 12v input supply.
1
vote
2answers
534 views

Factors determining number of turns in field winding of Sychronous generator

the question is simple, based on what factors do I choose the right number of turns in field winding (for synchronous generator)? It seems like the less turns there are, the more DC current is needed ...
1
vote
1answer
69 views

Ferrite Choke wiring, understanding the datasheet and how it affects the signal

I've been tasked with digitising an old analogue product for my company. I'm attempting to reverse engineer the analogue circuitry with no documentation (it was designed by an outside consultancy 30 ...
1
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1answer
101 views

swapping the ground reference on a transformer's secondary winding

I'm looking to build a [simple] high voltage power supply in order to make electrets via corona discharge. I'd like to be able to fabricate both positively and negatively charged electrets using this ...
1
vote
1answer
62 views

Shielding mains transformer to decrease interwinding capacitance

Has someone tried to shield mains transformers in order to decrease the interwinding capacitance? I have a transformer (toroid, power is about 5 VA,) and interwinding capacitance is a problem. As ...
1
vote
0answers
810 views

How to identify and wire leads on a one phase 6 lead, capacitor start, capacitor run electric motor

The leads are labeled U1, U2, U5, U6, Z1, and Z2. My research has found wiring diagrams on 4 lead motors where U1 & U2 are main winding and Z1 & Z2 are auxilary winding. Start capacitor wired ...