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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3answers
173 views

Is this explanation of a common-mode choke correct?

I am trying to understand how common-mode chokes work. I get the basic concept: the signal lines are joined by a transformer, such that each line will aid or impede current in the other. But I am hazy ...
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56 views

Why are inverter bus bars made overlapping?

A lot of literature on bus bar design suggests that bus bars should be made to overlap or have equal area such as this. The reason they mention is the total stray inductance falls due to increase in ...
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Why is the inductor's voltage not specified in the datasheet?

I looked through a few inductors' datasheets and in none of them is the maximum voltage specified. Even Mouser does not let you filter inductors by voltage. Why is that? Is inductor voltage "not ...
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59 views

Transformer Design I do not understand how to adjust AL when adding an air gap

I am trying to follow: http://ludens.cl/Electron/Magnet.html Specifically this section and how AL is adapted when an air gap is added (Initial AL is 6µH): Let's see what happens if we add an air gap ...
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Why does inductor core saturation depend on the temperature?

For example at room temperature (20ºC) the saturation current is 450mA and with 100ºC the saturation current is 350mA. What causes this? (Edit) The higher inductance with higher temperatures and lower ...
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Does the current or voltage switch when an inductance goes from being a load to a source?

When first S1 is closed to charge the coil the voltage UL and current IL are inline and positive. When the switch S2 closes and S1 opens, does the current or voltage switch direction?
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Reactive power and eletro-mechanical analogy

Regarding this question, I will try to use the analogy of the differential equations $$F = m\frac{dv}{dt}$$ and $$V = L\frac{dI}{dt}$$ and $$w = \int Fv dt$$ with $$w = \int VI dt$$ to figure out the ...
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59 views

Is the association of useful work to active power a convention?

I know that there are many questions about reactive power. What I am trying to understand is what is sometimes called useful work associated to active power, compared to no useful work for reactive ...
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88 views

Calculating the parasitic inductance of a capacitor

I have looked at this article, but it does not answer my question. My question is: how would you go about measuring and/or calculating mathematically the self-parasitic inductance of a capacitor if I ...
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1answer
90 views

Why does switching OFF heavy electric loads cause a surge in voltage?

A voltage surge is a higher-than-normal voltage that temporarily exists on one or more power lines. Voltage surges are normally caused by the switching OFF of heavy electric loads. I know that most of ...
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63 views

Impedance of PCB track

I was wondering if PCB tracks have a typical complex impedance? This is for a signal of frequency 1khz.
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Mutual Inductance Practical Explanation

I can't understand why the Mutual Inductance is measured in Henry. The self inductance of a coil is the abillity that has a coil to create a magnetic field that produses a voltage on itself so to ...
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Is this video fake? I thought Tesla coils only worked on AC

This video shows a 9-volt battery is connected to a wire as a primary. The first reason I think this is fake is that he is powering a Tesla coil with 10 volts. The second reason is that Tesla coils ...
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1answer
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What is a good loop probe to use for non contact measurements at 13.56MHz?

I have a receiving antenna (9 turn spiral, 1cm in diameter) that I would like to measure (inductance) wirelessly at 13.56MHz. While looking through application notes from ST and NXP semiconductors, I ...
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1answer
57 views

Calculate inductance and capacitance of a double layer antenna (RFID)

I want to design an antenna that will work with RFID NFC chip NHS3152. The NHS3152 IC specs are: IC capacitance at precise measurement conditions For this particular IC, there is a demoboard. Since I ...
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2answers
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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,...
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56 views

Internal Inductance of MOSFET

Datasheets sometimes define an internal inductance (example here). From what I've read, internal inductance is defined as the inductance of the wire's flux acting on its internal cross sectional area. ...
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3answers
66 views

DC-DC fixed voltage output converter and EMI Design, where to begin and roadmap?

I'm in a group of people tasked to design and implement a DC-DC converter with an output voltage of 24 volts, with an input voltage from 9 to 36V, with an EMI filter, which must comply with the ...
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1answer
75 views

Does the length of differential probes matter? Are we possibly measuring something that is not really occurring in the circuit?

So we're measuring waveforms across certain terminals of an IGBT and noticed that when we extend cables of our differential probes (by about 1.2 meters/4 feet), ringing occurs and we are worried it ...
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58 views

LVDT Simulation in Spice

I have a two-coil LVDT where the position of the rod relates to a level of vacuum. I excited the LVDT with a 2V ptp AC sine wave and measured the Vrms in (700.6V per Picoscope) and Vrms out to ...
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2answers
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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 ...
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3answers
68 views

Inductor datasheet Frequency question

I'm currently looking at SRR1240-8R2M. On the datasheet, it shows us the inductance of the inductor at 100KHz is 8.2uH. But I'm trying to run my circuit at 2.2MHz. How do I determine the inductance ...
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1answer
116 views

Common-mode choke on LTSpice

Can someone suggest to me how to select a three-phase common-mode choke with self and mutual inductance in LTSpice?
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79 views

Simulating an Old Vacuum Sensor

I have an old vacuum sensor. This sensor consists of two windings on a coil and a metal shaft that moves according to the ambient pressure and the vacuum level. The sensor is calibrated at the factory ...
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1answer
182 views

What is magnetization resistance and how to calculate(or measure, or estimate) it?

What is magnetization resistance? How to calculate or measure or estimate it? Edit: I'm trying to build a smps simulation on simulink, in transformer block I have a parameter named magnetization ...
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87 views

Imagine having a broken radio transmitter, and I need to make it work by building a solenoid with an inductance of 100 uH. How can I do it?

This is a problem made by my professor. Imagine having to repair a radio in a rural area, without any high-tech instruments, and I need to build a solenoid with an inductance of 100uH, a cross-section ...
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23 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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0answers
35 views

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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2answers
70 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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4answers
78 views

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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1answer
55 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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1answer
251 views

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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57 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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1answer
51 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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1answer
99 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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1answer
67 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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42 views

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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3answers
179 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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1answer
62 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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1answer
91 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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1answer
39 views

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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1answer
49 views

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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3answers
562 views

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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3answers
221 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
78 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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1answer
26 views

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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1answer
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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1answer
57 views

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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