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Questions tagged [winding]

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0
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2answers
32 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
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1answer
44 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
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0answers
35 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 ...
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0answers
22 views

Flux and inductance in simple motor

This is the front view of a cylindrical motor of depth (or height) \$D\$. There are three windings: \$\alpha\$ (stator), \$\beta\$ (stator) and \$\gamma\$ (rotor): Considering the core to be of ...
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0answers
50 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 ...
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0answers
124 views

I have designed and 3D printed a new motor that was based on a video i saw earlier, however motor keeps stuttering and wont turn, what went wrong?

Figure 1 Figure2 I started by doing 150 turns on each coil making sure they were winded in the same direction, then connected the starting point of each coil together and took each phase winding to ...
0
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1answer
40 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 + ...
0
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2answers
60 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
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0answers
149 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 : ...
6
votes
3answers
632 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 ...
1
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2answers
568 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. ...
0
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1answer
67 views

What will happen when taps at secondary side of auto-transformer are connected together (short-circuited)?

In case of Auto-transformer, there is only one winding, having three lead wires (1 for primary/input, 1 for secondary/output, and 1 common between both). At the secondary side (the output side), there ...
2
votes
1answer
148 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 ...
0
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1answer
148 views

Do you have to wind transformers the same as electromagnets?

Do I have to wind transformers in the same direction, as in each layer the winding must go in the same direction, like an electromagnet. And does this change with flybacks? Are their windings any ...
0
votes
1answer
316 views

Can I coil directly onto the iron cores of a stator for a basic generator?

I am constructing a very basic miniature generator (25mm diameter), the rotor has 8 bar magnets, and there will be the same number of coils, wired appropriately, in the stator. . I understand that ...
1
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2answers
370 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 ...
2
votes
1answer
131 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 ...
0
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1answer
220 views

Is my rotor/stator configuration correct?

Question 1) I am trying to make a miniature alternating current (ac) generator from elementary first principles. Before I waste a lot of time (and copper wire), I wanted to check if the ...
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6answers
613 views

What transformer I should use for negative ion ionizers

If I want to create a device that produces high static electricity fields, such as negative ion generators, what kind of transformer specs I should look for? I want super huge static electricity, and ...
0
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3answers
211 views

Need some help with identifying the primary on a power transformer

So a friend of mine had an old amplifier which he didn't want anymore so i told him to give me the transformer before throwing it away since i might need/can use it in a future project. But since it ...
0
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1answer
345 views

Ideal Transformer equations when the secondary winding is short-circuit?

This is my problem Now I know that ideally $$V_1/V_2 = 1:α$$ and $$(J_1-J_3) = α (J_2-J_3)$$ where J1 is the current of the left mesh, J2 is the current of the right mesh and J3 is the current of ...
0
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2answers
320 views

Identifying a multiple secondary unknown transformer

Background I have a step-down isolated power transformer (EI-66x36) designed for 60Hz with one primary input Vp=110V and three secondary outputs : Vy=10V, Vb=26V, Vr=30V. Unfortunately I don't know ...
0
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1answer
407 views

Brushless motor at constant speed

I'm looking to rewind a brushless motor to run at maximum efficiency for a given voltage and RPM. let's say given the supply voltage is 12v, I want it optimised to run at a constant RPM of 4000 and ...
0
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1answer
137 views

For Brushless DC Motors would one expect harmonics to be different between Delta and Y stator windings?

Given two 3-phase brushless DC motors with the only difference being that one is wound delta, the other Y with center grounded, would I expect to see high frequency voltage-current harmonics to be ...
0
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1answer
72 views

How are potentials developed between secondary windings in this circuit?

I've always had trouble understanding potentials and current flow between secondary transformer windings and this example is fairly typical. The schematic shown is a straightforward linear regulated ...
0
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1answer
89 views

How can a DFIG have total control of reactive and active power?

I'm confused with the power flow of the rotor to the grid, specifically the both-way direction
3
votes
1answer
337 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,...
1
vote
1answer
637 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 ...
0
votes
1answer
510 views

Calcualting the number of magnet wire turns and layers in a coil bobbin

I'm trying to find a formula to calculate the number of turns needed in a thermoplastic bobbin to use in a electric motor. Instead of using magnet wire in the slots of a lamination stack, the bobbin ...
0
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1answer
66 views

Winding mutiple axis coil

Wire coils can be used to 'pick up' alternating magnetic fields as described by Faraday's law. I want to do this in multiple axes around a single core. How could I do this in practice at a ...
0
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1answer
166 views

Transformer Output issue [closed]

I am designing a power supply based on ST Viper 37. The supply is isolated and outputs 17V with CT transformer. I got the transformer designed from the design center. One with Centre tap and another ...
0
votes
0answers
46 views

Can I improve the high-frequencies absorption of a ferrite inductor with two opposite winding directions?

A choke if effective against common mode currents by having two windings in opposite direction around the same core. Currents common to both wires produce opposing magnetic fields and get cancelled. ...
1
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1answer
140 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 ...
0
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1answer
76 views

Are Variable Motor Windings Possible?

Obviously the Torque and RPM of an electric motor are dependant upon how many turns of wire there are, is it possible to make the number of effective windings (semi)dynamic through the use of MOSFET ...
4
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2answers
865 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 ...
0
votes
1answer
597 views

Is there a mandatory pattern for stator windings in 3 phase induction motors?

Imagine simple 2 pole 3 phase induction motor, is there a mandatory pattern for the stator windings to creat a rotating magnetic field? Why must the angle between the coils be 120 mechanical degrees ...
1
vote
1answer
99 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.
3
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3answers
2k 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 ...
0
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2answers
560 views

why commutator requires so many slots

At a given point of time, current in any wire in armature winding is either positive or in negative direction, then why there is a need of so many slots in commutator? doesn't a two slot commutator ...
2
votes
1answer
125 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 ...
0
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1answer
687 views

Modifying switching power supply to produce any voltage(s)

I have few units of 24V 3A output smps power bricks. I'm planning to mod one of this to generate 12V at least at 5A for my LED strips. My idea is to tap two wires from the secondary winding of the ...
4
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2answers
3k 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 ...
0
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2answers
4k views

Direction of winding (clockwise/anticlockwise) in flyback transformers

Here is a circuit of offline switching power supply based on Viper22a IC: In this circuit and many other similar circuits, they denote the starting of a winding by a "dot". However they never mention ...
-1
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2answers
675 views

Calculate primary winding current in transformer under load[Exercise]

I have been trying to get to the answer to this exercise shown in the Solutions' reference page but despite countless attempts couldn't get to it. it reads as follows: ...
-1
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1answer
505 views

Motor pump slowed down due to suction blockage

I have a 1 HP, 220V motor pump which was working fine till recently. Last day, some dirt and dried leaves got into the foot valve and blocked the suction pipe. I ran the pump for sometime in that ...
0
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2answers
747 views

Why is the voltage more in case of same polarity during a polarity test of induction motor?

I was performing experiment in the lab of my university. The experiment was supposed to be performed on a squirrel cage induction motor. But I performed it on a three phase slip ring I.M with its ...
0
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2answers
2k views

Burning Temperature of Copper Winding of Motor

Burning Temperature of Copper Winding of Motor. I Have 3 motors 150watt 0.75Amp 220V in Copper and Aluminum and Copper clad aluminum. I want to know the maximum internal temperature of these motors ...
2
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1answer
127 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. ...
5
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1answer
3k 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 ...
5
votes
1answer
1k 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 ...