Inductance is the property by which a change in current in a conductor induces a voltage both in the conductor itself and nearby inductors, the latter being the basis upon which transformers operate. Discrete inductors are also available that have many applications including filtering and energy ...

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How to stay well grounded?

After some read about ground plane breaks and inductor loops, now I am totally confused about how to design good PCBs. I made a small example of a two layer PCB. Blue is the big ground place. Red are ...
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1answer
28 views

converting inductance to electromagnetic force

How might one determine the amount of electromagnetic force produced by an unshielded inductor? E.g. How much holding force does a 600uH unshielded inductor posses? Or alternatively in reverse: How ...
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0answers
10 views

Power in non-ideal transformer

An expression for non-ideal transformer. I have found the ideal power as follows: P= VI=VL*IL= (VsRL/(Ro+RL)*(Vs/(Ro+RL)=Vs^2/((Ro+RL...
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4answers
476 views

PCB Trace Layout to Minimize Inductance

I was wondering what the intuition was behind widening PCB traces to minimize the inductance between a trace and its ground plane. Many high speed design guides cite this without providing much of an ...
0
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1answer
35 views

Find the inductance using function generator, oscilloscope, capacitors, resistors, multimeter, voltage generator

I am trying to find the inductance of a inductor. I have tried many different methods such as putting the inductor in parallel with a capacitor to form a tank circuit and in series with a resistor ...
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0answers
20 views

Closed loop shapes with zero mutual inductance?

I have done numerous searches trying to find any mention of theory or experimentation done on determining closed current loop shapes that have zero mutual inductance and...no dice! Of course you can ...
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2answers
59 views

Calculating voltage spike of an inductor

Suppose there is a circuit like this where the inductor has no resistance In this circuit, if Switch 1 is initially closed, then there is 10/100 = 0.1 A of current flowing through the inductor. ...
0
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1answer
39 views

Can you run wires to an inductive heating coil or will that be a bad idea and why?

I have an inductive heating circuit that runs at around 5A at 24V (I'm estimating here). Is it possible to place the inductive heating coil a distance away from the circuit and connect the circuit to ...
0
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2answers
93 views

Why does current flow in circuit when dc voltage is applied to inductor?

I read in my textbook that when dc voltage source like a battery is connected to inductor,it develops an emf which opposes the increase of current in the circuit.On applying kirchoff's law in the ...
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0answers
32 views

Relation between frequency and inductor current

I have a question regarding frequency and inductance. What is the relation between frequency of an applied voltage that is square wave, over an inductor, and the average current that would flow ...
4
votes
1answer
82 views

How can I describe mathematically what is happening in my home made LVDT variant?

I've built an LVDT (Linear Variable Differential Transformer) that is a little different than how it is conventionally done with 2 secondary coils positioned adjacent to a primary coil. My design is a ...
0
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1answer
53 views

Is it possible to measure inductance without LCR Meter/OSC/FG

Like the question, i don't have an oscilliscope/Function Generator/LCR Meter. I do have a multimeter and a lot of "scrap inductors" that i would like to measure. I have searched a lot on the web and ...
4
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3answers
495 views

How does an inductor block frequency?

I know the basics of self-inductance, and how an inductor creates a voltage/current that opposes the increase or decrease in current. I can't find anything on how it reacts to/blocks certain ...
2
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1answer
60 views

Induced voltages and flux within a transformer and their polarities

This is a multifaceted question, and is more to see if I understand what happens inside a transformer. I understand the general idea behind transformers: Alternating voltage that is applied to the ...
-1
votes
1answer
59 views

Design for a small shop 240-volt induction heater?

I am interested in finding a design for the electronic/electrical components of an induction heater for a small shop using a 220V 60Hz input. I do not need designs for the coils and cooling system, I ...
0
votes
1answer
73 views

Are low ESR SMD capacitors with jumper wires between their legs and the circuit OK?

I have a board with two super low ESR SMD electrolytic capacitors which came off the switching power supply of a notebook motherboard. The legs of the capacitor are still soldered on the board. One of ...
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1answer
61 views

Spaced air core inductor wire size effect?

I'm intrigued by the second circuit in Spehro's answer and/or it's precursor (FM Crystal Radio) http://electronics.stackexchange.com/a/217086/33670 But I don't happen to have any 18 Ga solid wire, ...
3
votes
2answers
59 views

How signficant is leakage inductance in a flyback converter?

In designing some flyback DC-DC converters (to give us isolation), we have been simulating potential designs in LTSpice, which has gone well. (Isn't LT great at documentation? Pretty much perfect ...
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1answer
43 views

Finding L and R in AC circuit

Ammeter readings: A1 = 4A A2 = 2A A3 = 3A Voltmeter reading 24V. Circuit is in AC. I have to find R1,R2 and L. While calculating R1 (R1 = 24V/2A= 12 Ohm) seems to be easy, next steps are not ...
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1answer
50 views

AL value: nH/N² vs. nH/T²

I'm in the process of sizing some toroidal ferrites. My problem is that I am seeing the AL value on the datasheets shown two different ways as nH/N² or nH/T². Are these two units identical? I believe ...
2
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2answers
64 views

Meaning of infinite self inductance

I am reading about the characteristics of an ideal transformer and it is mentioned that self inductance of each coil is infinite. Could someone help me to understand the physics behind it? When self ...
0
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1answer
48 views

Why is inductance negative in this triphase mutual inductor?

Suppose I have a threephase circuit with a mutual inductor on the first and second phase (V2 and V3). One way of solving the circuit (ie finding the phase currents) would be the following: convert the ...
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2answers
48 views

equivalent inductance

If two circuits 1 and 2, are coupled through the coils of inductance L1 (in circuit 1) and L2 (in circuit 2), how does the inductance value of L2 affect L1 ? and what is the inductance value seen by ...
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2answers
56 views

equivalent inductance

I have a basic doubt in understanding the concept of equivalent inductance. When two inductor coils are in series the equivalent inductance is calculated as \$ L_{eq} = L1+L2 \pm 2M \$ (depending on ...
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2answers
38 views

Where should I look for transformer inductance discrepancy?

I'm experimenting with this smallish (~15VA) toroidal line transformer as a "lab" exercise as I'm learning about transformers. Right now it has its original 115V primary winding only; I "unwound" and ...
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2answers
91 views

inductance of multi-stranded wire

The inductance of a single loop of wire will increase in inverse proportion to its diameter. Are there exceptions to this rule when applied to multi stranded wire (not litz wire). I should make it ...
0
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1answer
50 views

Welding Transformers?

I was thinking of making a carry handle for two microwave oven transformers in series, and also so that they can share a common ground without having to split the ground wire. I thought about bolting ...
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1answer
96 views

How to choose the correct inductor for my application

I am planning on using induction to power some game pieces in a project I am building. My plan is to use identical coils in board and piece, so they will be small (2" max diameter). My problem is ...
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3answers
91 views

Does mutual inductance change individual inductances?

If I have two inductors, with inductances \$L_1\$ and \$L_2\$. I put them really close to each other to make a transformer. Are their individual inductances still \$L_1\$ and \$L_2\$? Or has the ...
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1answer
60 views

Are those calculations for primary coil of a transformer correct?

The calculations in this question are based on my previous quesion: How many turns do I need for the primary coil of a transformer? Marko Buršič said : "B_max shall be between 1.3T and 1.6T, but not ...
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2answers
122 views

How many turns do I need for the primary coil of a transformer?

I need to know the number of turns that should be connected to 220 volts AC. I can measure resistance only, I don't have a device that measures inductance. If I need the primary coil to be 220V / 1A ...
0
votes
1answer
121 views

How to find L value of a coil?

I am a newbie at electronics and was hoping I could find some help. I have a coil with a removable iron core, photo for which is given above. I tried to find L1 or the inductance of the coil. I ...
0
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1answer
21 views

Inductance calc for Edge Coupled Differential Pair?

Apologies up front if this topic has been addressed. I've searched on StackExchange and am concluding that this structure is uncommon as there is no ground return accompanying the differential pair ...
0
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1answer
49 views

WPC Inductive Power Transfer

I am building an Inductive Power Transfer (IPT) system. As of now I am using a design based on a flyback converter. It works great but I am having issues adding features such as power control feedback ...
1
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1answer
48 views

Sensing inductance change in high power (20 watts) wireless transmitter

First post here. I have a built a wireless power transmitter that consists of 2 flat spiral coils that transmit about 20 watts across a short distant to power a heating element. The coils inductance ...
1
vote
1answer
90 views

critical inductance value when designing a buck converter

From the formula used in this literature from Texas Instruments http://www.ti.com/lit/an/slva057/slva057.pdf - Page 15 Here are my requirements: Vo-Output voltage(v) 98 Vi(max)-Maximum input ...
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0answers
148 views

Mutual inductance

Find the value of R such that 10W of power is dissipated by it. The provided answer is R=2.25 kohms. Perhaps it is incorrect?
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0answers
113 views

Explanation of Lq, Ld and how it relates to motor inductance

I'm pretty much a novice to motor controls, but I was wondering if any of you could explain the concept of d-axis and q-axis inductance and how it relates to the inductance L that is usually specified ...
15
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6answers
2k views

LC circuit, bigger L than C, or bigger C than L?

So if I want my LC circuit to resonate at 20MHz, I just use the formula, \$F=\frac{1} {2\pi\sqrt{LC}}\$. Using available inductor and capacitor values, there are lots of different possible ...
0
votes
2answers
73 views

how can i choose my inductance? [duplicate]

I calculated my inductance value and current rating but I can't decide which inductance I have use. for example 10uH, max 800mA my inductance values but there is other variables.in this topic I have ...
5
votes
1answer
242 views

Induction heater circuit problem

I am trying to build induction heater with the help of the following schematics(taken from this page): So I am using 220:10Vrms(15Vpeak) transformer with fullbridge rectifier and a capacitor to get ...
1
vote
2answers
42 views

Why does the effective reluctance between two windings change?

The effective reluctance between the two windings should remain same, no matter on which arms they are placed. The pair of arms with less cross sectional area will offer more reluctance as compared ...
0
votes
3answers
160 views

Getting resonant frequency in LC circuit with L as air core coil

im trying to find inductance of the air core coil,i read that in LC parallel circuit with known capacitor value we can find unknown inductance value by the formula so need to find 'f' resonant ...
0
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0answers
57 views

Leakage inductance of a transformer

Wikipedia article on Leakage inductance provides a formula for the leakage: These equations can be developed to show that, neglecting associated winding resistances, the ratio of a winding ...
1
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1answer
116 views

Is my oscilloscope affecting my tuning circuit?

I am building an AM Radio and I have constructed a tuner circuit. See below. simulate this circuit – Schematic created using CircuitLab However, I cannot use this circuit, because even ...
4
votes
3answers
191 views

Sensing a Bullet

I am attempting to design a sensor that can non-invasively detect if there is a bullet in the chamber of a gun. To help explain my problem I have put together some models and images for you. First off ...
3
votes
1answer
141 views

emitter to base amazing transistor effect

As I'm a beginner I was playing with transistors connecting them parallel, serial, making AND/ OR logic gates and so on. I connected all collectors to + and each transistor emitter to another one's ...
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1answer
58 views

Find the inductance of the copper coil? [closed]

I have copper coil Its length is 20 meter, diameter is 1.66mm. How can I find the inductance of the coil (with out applying the voltage)? I got it, actually. I wound the coil on a hard paper, the ...
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0answers
115 views

General Question about Coil wrapped around a transformer core

I had a doubt about how inductance of a wire is calculated if it is wound around a iron rod, and when its wound around a transformer core. Case 1 : Considering an iron rod at first , or in other ...
0
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2answers
760 views

Dependence of Inductance of a Coil on the gap between turns?

I was wondering how does inductance of a coil say wrapped around a core change by increasing the gap between turns ? Usually it shouldn't depend on it from the Formula of L being equal to (uN^2A)/L ...