Questions tagged [winding]
The winding tag has no usage guidance.
106
questions
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?
0
votes
2answers
83 views
Rogue winding on flyback transformer?
I was reverse engineering a battery charger (Lidl brand Parkside 20V battery charger PLGS 2012 A1, with smart functions, among them charge current and termination voltage settings) and came across ...
0
votes
1answer
61 views
How is current distributed in the cross-section of a wire? Skin effect for motor windings?
The startup h3x is claiming to have designed 3d printed coils and other innovations increasing the power density of electric motors by a factor of 3.
https://www.h3x.tech/#amcoils
They mention fill ...
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 ...
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 ...
1
vote
1answer
147 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 ...
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,...
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 ...
0
votes
1answer
57 views
Transformer Winding Resistance
I have a SMPS transformer and a LCR meter.
I can measure 3 different resistance on a winding:
R on a certain frequency(10kHz): 0.065R
Rs: 0.086(I don't know what is this)
DCR: 0.06
Which one is the ...
0
votes
2answers
159 views
How to limit current for a transformer?
So I've been winding and unwinding, all to get the current right but it's not going well, so I'd like to know how I can limit the current going into the primary side of my transformer, since the ...
0
votes
2answers
71 views
Number of windings keeping constant the poles
What happens if I increase the number of windings around the poles keeping constant the number of poles in a motor? for sure the rotational speed should be the same, I think that we will obtain a more ...
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
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 ...
0
votes
1answer
53 views
Building a pseudo-solenoid electromagnet - Heat disipation
I am planning to build an electromagnet as shown in the picture below. The copper windings are coiled around a thin plastic cylinder. The goal of the setup is to attract small metal chips floating in ...
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 ...
3
votes
2answers
173 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 ...
0
votes
1answer
199 views
Reducing equivalent self inductance of an inductor
Let's say I have a coil of N turns and it is wound on a rectangular core and when we connect a voltage source through both terminal of coil flux is generated in core , now I wanted to reduce that flux ...
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 ...
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 ...
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 ...
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 ...
0
votes
4answers
554 views
Grinder hums but won't run. Capacitor seems good, and so do windings
My Grandpa gave me a bench grinder recently to fix. He said he was using it a lot, grinding and grinding, then he heard a pop, and it stopped working. Now it just hums, and starting it by hand doesn't ...
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 ...
0
votes
1answer
699 views
What are the properties/advantages of concentric winding?
I have seen several 4 pole induction motors that have coils wound like this:
Both the main winding and the auxiliary winding have 2 pairs of these coils.
This is concentric winding and I've only ...
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 ...
-1
votes
2answers
71 views
Linear variable differential transformer operation as load position feedback
I was doing some research on servo position systems and saw that Linear Variable Differential Transformers are used as feedbck systems that feeds the current load position to an error detector. So I ...
1
vote
1answer
146 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 ...
0
votes
1answer
225 views
Can we use Litz multi-strand wire as Tesla coil secondary?
I am making a mini Tesla coil as a proof of concept. I was thinking, can we use multiple enameled copper wires as the secondary? (Edit: Every wire is individually enameled and the ends sanded to ...
0
votes
0answers
40 views
Need help grasping the routing of coils for stator and rotor
I can see it with just a 3 coil motor, whether it be in different configurations, but loads of different motors have some 72 or umpteen different stator slots and winding for the rotor.
It was my ...
1
vote
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 ...
0
votes
1answer
71 views
How to find the 120 degree phase angle in a single layered lap winding of a synchronous machine?
Ok, so I have a 4 pole synchronous machine with 24 slots meaning each slot has a phase difference of 30 degree with respect to each other.
1)That means pole pitch is 180 degree for a full pitched ...
0
votes
1answer
107 views
Obtaining constant mechanical energy from a DC Machine [closed]
Out of the five types of dc machines:
Separately excited
shunt dc motor
permanent-magnet dc motor
series dc motor
compounded dc motor
which one will be the best for obtaining constant mechanical ...
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 ...
0
votes
1answer
63 views
A coil I built has divergent measurements respective to wire resistance and AWG size
I'm not exactly into building precision coils, but I decided to make one for a subwoofer voice coil.
I used what was supposed to be AWG 28 wire, it completely fit the diameter. I wound it tightly ...
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 ...
0
votes
1answer
50 views
Is the formual for winding distribution factor and winding pitch factor for n-phase (intergal-slot winding) machine as 3-phase machine?
[]
1 In Image, alpha is the slot angle and eta'v' is harmonic-ordinal, q= solts per pole per phase
[2]All book provide formula for 3-phase winding, and so far no material for n-phase winding.
...
0
votes
3answers
2k views
Center-tap transformer current calculation
I have a transformer with two secondaries, one is 24 V / 500 mA and the other is 12 V / 200 mA. I want to wire them in series to make a center-tap transformer:
simulate this circuit – Schematic ...
0
votes
1answer
117 views
Impact of Transformer Ratio to Performance of Transformer
Based on my initial calculation, the primary inductance of my transformer will be around Lp = 351uH. This 351uH is designed with switching frequency of 55kHz for AC-DC flyback converter (DCM). By ...
0
votes
2answers
189 views
Transformer auxiliary winding
I'm designing an AC-DC based on the UCC28780 active clamp flyback controller .
I have a question about the primary auxiliary winding that is supposed to power the UCC28780 and the gate driver. My ...
0
votes
1answer
91 views
DC motor accuracy with encoder
I am building a coil winding machine and I've already set up something that works. I used two nema17 stepper motors and tb6600 stepper driver cards. The problem is that motors are seems to overheating ...
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 ...
0
votes
1answer
374 views
Why is there a resistor between the primary and the secondary winding?
I recently opened up a linear power supply and found out it has a resistor of 8.2M ohm between the primary winding (specifically in the neutral) and the secondary winding of the step-down transformer.
...
0
votes
2answers
288 views
Transformers: Short-circuit test
In a short-circuit test where the secondary winding is short circuited, how come the primary voltage isn't zero (in real life) when it should ideally be zero?
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 ...
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 ...
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 ...
0
votes
1answer
100 views
What is the voltage between each turn in a transformer winding
From a perspective of insulation, how much voltage between each individual turn in a transformer?
Example from picture above, the primary winding have 16 turns. Let`s say 800VDC is applied between + ...
1
vote
2answers
311 views
Transformer windings order
I have several transformers for audio amps, with single thiner primary and dual larger area secondary windings, for lower voltage higher current. They are toroidal, all by different manufacturers, but ...
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 :
...
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 ...