Questions tagged [inductance]

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 storage.

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17 views

Boost PFC with large leakage inductance

I would like to implement a boost PFC stage for an alternator that has a large leakage inductance (~40mH). When looking at the schematic, we can see that the boost inductance ...
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What device has high inductance? For example >1000mH (for 220Vrms 50-60Hz output) [duplicate]

What devices have high inductance values (for example >1000mH?) What I found in a real device (for example induction motor) datasheet is just near <1000mH (on rotor and stator.) Is there ...
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62 views

How to understand this formula.?

I am having ferrite core T60006-L2063-W517 Ferrite Toroids /Ferrite Rings Core 63x50x25 58.6uH@10kHz. I wanted to measure inductance of the core from datasheet it shows, Ferrite Rings Core 63x50x25 58....
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Inductor Used on Power Supply to DAC?

I was just looking at the schematic shown below for a DAC. Anyone know why the iron core inductor (L1 circled in red) is included? My guess is that it's used to ramp the power up/down when powering ...
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Coupled current in shield in a tube from a transient surge

If a shielded cable (B) is running inside the centre of a tubular structure (A), how is the coupled current from a surge estimated in the shield? I am trying to figure out how the coupled current ...
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53 views

The relations of the value of the constant of integration is zero between a DC component

I've been may asking the really easy question. The circuit which was made of the AC source and the coil exists. \$L:=\$self inductance of the coil. \$v(t):=v_0*\sin(\omega t)\$ (The voltage between ...
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How to choose the right frequency when measuring coil inductance with LCR meter

I would like to drive a 12V DC hydraulic valve coil using a high side driver (VN7140AJ). The driver datasheet specifies the maximum demagnetization energy (page 24), and I would like to make sure that ...
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53 views

Electrical conductivity circuit help, with two solenoids

I have a project im working on but cant seem to figure out the basic of the circuit. The principal of the circuit is two solenoids wrapped around a chemistry glass making a magnetic field. The purpose ...
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42 views

What is inductance of common household appliances [closed]

I am building a diy inverter and I need to calculate required DC bus link capacitors capacitance. But to do this I need to know the load inductance. I did not find any information about how many ...
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72 views

What could be the cause of high leakage inductance on my custom flyback transformer?

I've built a flyback transformer by hand for a circuit I am making and after shorting the secondary I have found my leakage inductance is very high. The primary inductance is around 2 mH, while the ...
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51 views

Can I use a laminated silicon steel transformer core as a low frequency boost converter core?

Since laminated silicon steel is used in low frequency transformers, can't I also use it as an inductor in a low frequency boost converter, at maybe 100Hz, theoretically shouldn't this work as well as ...
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Difference between ferrite pipe core and full ferrite core?

Disclaimer: I’m computer scientist It is possible to buy ferrite pipe core coils and full ferrite core coils. The seller sell them for audio applications. I’m considering using the coil to measure a ...
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129 views

Effect of core losses on inductance in high-frequency LC circuit?

How will the core loss (hysteresis and eddy current loss) in an LC circuit at high frequencies (about 800kHz) affect the inductance of the inductor. When I measure the frequency I can see that it will ...
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59 views

How to calculate reduction of inductance eddy currents in ferromagnetic core?

Suppose you have a LC circuit. Now at high frequency the core loss of the inductor meaning hysteresis and eddy current loss will increase. When this happens the frequency increases while the ...
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79 views

Inductance of air core coil decreasing due to ferromagnetic object put in it?

I have built a Colpitts oscillator which you can see in the schematic below. Note that the values for R1 and L2 are not correct since I use a self-wound air core coil for L2 which means I can only ...
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Inductance of distributed air gapped core

I have got two sets of E70/33/32 core of N87 material, one set with centered airgap of 8mm and another set is un-gapped core. I measured the inductance for N number of turns with centered gapped core ...
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Transformer coil (reactor) inductance value in AC (El type)

I want to use one of these inductors (EI type transformer coils with air gap) in series to a speaker (woofer) to filter out high frequencies. https://www.hammfg.com/electronics/transformers/choke/195-...
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Calculating inductance using PEEC Model

I'm learning of how inductance is modeled in wires by breaking them down into smaller filaments. I don't understand how the different inductances add up. Say we want to calculate the total inductance ...
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Decoupling Capacitor Loop Length vs Loop Area

When considering inductance reduction, what is considered more important? Reducing the loop length or the loop area? Below are two examples for visualisation, I am ignoring a lot of ways to reduce ...
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172 views

Intuitive way of “visualizing” how the energy is stored in an inductor?

I've been trying to more or less understand intuitively how energy is stored in an inductor, but I don't seem to get anywhere decent. In a capacitor I understand, I believe: an external battery pushes ...
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1answer
62 views

What equation should I use to calculate inductance of wire coil?

I've been working on a project recently which requires me to build an inductor, however in my research I found many different equations (with a range of variables used and giving very different ...
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RL Circuit with Time-Dependent Switch

We are currently studying RC, RL and RLC circuit but I am having a hard time comprehending some topics, like what is the function and importance of putting a 0 V source in series with the inductor in ...
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53 views

Why Doesn't the Current in a Transformer Diverge?

I just started learning about mutual inductance and transformers, and I haven't been able to find the answer to this question. I suspect it's really basic, and that I'm just missing some understanding....
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Question about LC Filter - Critical Inductance Lc

In the following screenshot from this video: Why in the proof to find critical inductance, \$L_C\$, is the following equation used: $$ I_{dc} = |I_{ac}|_\mathrm{(peak)} $$
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Measuring inductance of a cable

Its a little thought experiment. Below you see a transmission line consisting of 2 parallel wires. With an LCR meter, I am measuring the inductance of the cable. On the left side, the LCR meter ...
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LTSpice - Inductance simulation

Welcome back on this subject : I would like to simulate an inductance which varies linearly in function of the current which flows through it. Suppose : $$L(t) = I_{L}(t)$$ In the simulation for ...
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122 views

Induction heater resonance working

I was reading this article on the working of a induction heater. The below is a circuit show in the article which I was not able to understand. I have 3 questions : I think that Vsupply is a ...
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1answer
99 views

How can this inductor I built (picture in post) have such a low inductance?

I needed to study the rate of change of current (dI/dt) in a DC circuit, so I built an inductor using a laminated soft iron core from a small electronics transformer. I chose soft iron for I could ...
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1answer
185 views

LTspice - Simulation of a variable inductance

I would like to better understand how LTspice works with the variable inductor defined by using the flux through it. I have some troubles to understand why according to the above post the formula of ...
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1answer
51 views

LTspice Inductance simulation

I would like to vary the value of the inductance in function of the current flowing through it. Here is the simulation : I have some troubles to make the current at t = 0 to be equal to 0 without ...
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3answers
390 views

Starting torque of series vs shunt DC motors

Recently, I read that starting torque of series motors are much higher than shunt motors. I try to find out what is reason behind it and I get to know that this is because in DC series motor torque is ...
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MATLAB multi-player planar coil geometries Fasthenry, Fastcap

I'm looking for some software to calculate inductance and capacitance for planar coils: I have tried Layout editor - doesn't calculate inductance for imported gerber files from Kicad and I am not sure ...
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Understanding of coupling coefficient and power transfer efficiency

I am a bit confused about my derivation to get power efficiency from the coupling coefficient. The coupling coefficient \$k=M/\sqrt{L_1L_2}\$. $$ V_2=M\frac{dI_1}{dt}=L_2\frac{dI_2}{dt}\\ V_1=M\frac{...
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The equivalent inductance of a RLC in parallel

When studying a system that has the same behavior of an RLC parallel circuit, the slope of the impedance before the resonance corresponds to the value of the equivalent inductance, the slope after the ...
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101 views

Why can't superconducting inductors be used in LC filter design?

If I replace the copper wire of the coil with superconducting material, what will be the effect on the design of the passive LC filter?why superconducting cant design?
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LC in parallel with R circuit resonance

I've been doing an experiment which involves measuring the voltage across the capacitor at different driving frequencies. Consider the circuit below: A sketch of the experimental curve \$(R_1<R_2&...
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1answer
45 views

Effect on current due to relative motion of load in homopolar generator

Description of figure - A homopolar generator in which disc is rotating with constant angular frequency with respect to ground frame and a uniform steady magnetic field is present perpendicular to ...
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227 views

Alternate Inductor that can be used for MT3608 boost converter circuit

I am planning to use MT3608 schematic for my project to boost the voltage from 3.7V to 5V. I am planning on making a customized PCB with all the requirements that are needed for the project. In the ...
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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 ...
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58 views

How should PCB traces be treated in different situations?(as capacitance, resistance or inductance) [closed]

I know that for signal integrity, the PCB traces are always considered to be part of the electrical circuit. How should traces be considered in different situations, like high current, RF, high edge ...
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69 views

derivative of current confusion

Say you have some B field from an alternating current, B(t)=B0cosωt. And using Faradays law, e.m.f. ε = turns of a coil × the time derivative of the flux of the B field going through the coil area. \$\...
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Loop inside a loop, where is the mutual inductance greatest?

I had a question while working a problem as to where the mutual inductance of a circular loop inside a rectangular loop is greatest. Is it at the center, because the magnetic field of all four wire ...
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89 views

What is the best way to layout this ultra-low inductance capacitor with interleaved pins?

This TDK capacitor interleaves its pins to reduce inductance. For a high-pass tee filter, wouldn't I need vias to bring the negative lines off separate from the positive ones? But vias increase ...
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Understanding inductors with non closed/looping iron cores

Toroid inductors make sense to me. The magnetic circuit is closed. However, I do not understand inductors that just have a magnetic core in the center (like this one): Considering that the inductance ...
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74 views

electromagnetic energy harvesting LTspice simulation problem

In my project I need to use electromagnetic energy harvesting that provides below 1V. Rectification and voltage level boosting are required to meet the power supply requirements of typical electronic ...
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2answers
99 views

The results of my magnetic flux data from voltage recorded

For my electrical engineering senior design I created an experiment to test magnetic flux (more voltage) through a receiving coil. There is a large sending coil with A.C. voltage and a small receiving ...
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How to calculate rotor flux of the three phase squirrel cage induction motor?

I have a three phase squirrel cage induction motor with given parameters (stator winding connected in delta) nominal power: \$P_n = 22.4\,\mathrm{kW}\$ nominal stator voltage: \$V_{sn} = 230\,\mathrm{...
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48 views

Calculate the frequency corresponding to a given current or power attenuation in an LRC circuit

For a series LRC circuit, I'm trying to calculate the frequency corresponding to a given current (or power) attenuation to either side of the resonance frequency peak according to the formula for ...
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Identification of an inductor

Hi, I'm currently trying to figure out what is the significance of this number on top of an inductor. Does it mean the value of inductance?
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68 views

How to continuously vary inductance in the range \$[-A, A]\$, A>0?

I require an inductor whose inductance varies continuously as a function of some parameter \$p\$, like a bias voltage or something else that is easily user-controllable (not frequency as I require it ...

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