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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Capacitance Formula derivation

Can anyone help me with how this formula came in the first place (marked in red)? I am not able to understand the denominator term. This is with reference to Double Pulse Test taken from the book : ...
Andr7's user avatar
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Wireless power coils without shields [closed]

I bought these from aliexpress and they don't have a shield on them. I want to place an LED chip, mounted on a small aluminum heat sink, right behind the Rx coil but I'm worried the Rx coil will heat ...
Shaunak Patel's user avatar
4 votes
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143 views

Why does the Inductance change on an E-Core Leg when going from Small Copper Wire to Litz Wire?

In the first picture you can see 45 turns of standard 0.4 mm copper wire. The impedance analyzer (e4990) shows an inductance at 20 kHz of 11.5 mH. Which is inside the tolerance of around 12.8 mH +- 20%...
cu 29p's user avatar
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15 votes
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Why does an inductor's inductance decrease with current?

I am struggling to understand what seems like a fundamental behavior of an inductor. I am looking at a chip mount LQM18PN2R2MFR inductor. One of the diagrams on the manufacturer's website shows a ...
tronhawk's user avatar
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Using MOV to protect device for heater element

I have a heater element that is controlled by a solid state relay from main power. I know it is customary to place a MOV in parallel when switching inductive loads to clamp the voltage to prevent ...
realm god's user avatar
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2 answers
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Intrinsic safety (IEC60079-11) - assessing spark ignition of RLC circuit, but the L is placed before the zener barrier

My IS circuit contains an inductance, capacitance, and resistance. Shown below is the simplified schematic, with uncountable and countable fault applied, resulting in the most onerous condition: The ...
Never's user avatar
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1 answer
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PWM large current, will it kill MOSFET?

We are looking at PWM dimming 2700 LEDs. 3.2V forward voltage 20mA current each Connected in parallel This makes 54A in total. The longest stretch of cable is 7 meters (one way). Currently looking ...
mikabytes's user avatar
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2 votes
3 answers
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What are the potentials at front and back of inductor when primary DC supply is disconnected in LR circuit?

I have been learning the basics of inductors in simple LR circuits with DC currents. I think I get most of it but I am a bit unclear about the secondary EMF produced by the inductor after the primary ...
steveOw's user avatar
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Inductance of solenoid with solid metal core

Consider the solenoid/inductor like in the picture. There is an air gap between the coil and the inserted solid metal. The solid metal is from aluminum or copper (Both have a relative magnetic ...
Fan's user avatar
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5 votes
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Could a very high voltage and very low current allow a non-superconducting magnetic energy storage system?

A very low current with very high voltage can travel through high resistant wires without much loss. Could this type of current be used on magnetic energy storage without superconducting materials? ...
Fulano's user avatar
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Leakage inductance in a series resonant converter

I know that the leakage inductance is present due to the imperfect linking of flux between the two transformer windings. I have selected a core for the transformer to be used within a series resonant ...
Jonathan_the_seagull's user avatar
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How to get a smooth operation of multiplexed solenoids

My project involves 100 small solenoids, that I either have drive individually, or hopefully I can drive in a multiplexed configuration, the same way LED displays are driven. Then I only need 20 ...
Björn Morén's user avatar
2 votes
2 answers
91 views

Measuring inductance of motor coil with low Q factor

I have a motor coil that I suspect has an inductance outside the nominal range. I wanted to use a Maxwell-Wein bridge to determine the inductance of the bad coil. The main concern I have is that, as I ...
Numerical Disintegration's user avatar
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3 answers
133 views

Help measuring inductance of custom-made coil

I am testing some coils that will be used in a resonant circuit as antennas for very low frequencies (<100 Hz). The coils work great, but the only way I have to tune is trial and error. If I ...
chourizo's user avatar
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Does all the current lag the voltage in an inductor or is it only a small component?

the way I understood a basic inductive circuit (voltage source + inductor) is that all the circuit current (Io) lags the voltage by 90 degrees. However, I am following this blog tutorial to refresh ...
Baldovín Cadena Mejía's user avatar
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Why do inductors and capacitors cause phase shifts between current and voltage? [closed]

I am learning about grid level stabilization services. My native language is German and I am translating the specific terminology. If I use the English terms incorrectly please edit my below sentences....
Merlin Nestler's user avatar
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Power supply coupling of inductive resonant sensors

I'm working on an array of sensors based on Peltz Oscillators connected to a micro to detect objects based on shifts in resonant frequency when a target object gets close to the inductor. In isolation,...
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Electromagnetic Energy Harvester

It was suggested I make a new post since the topic was growing in complexity. I am looking into constructing an inductor to utilize electromagnetic induction near a high voltage transmission line. If ...
zdanman's user avatar
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Inductor not behaving even close to calculation

I wrapped a coil around a 1/2 inch X 6 inch pure iron rod. The coil is composed of #22 enameled copper and about 393 turns. 393 turn coil around a 0.5 inch (6 inch long) supposed pure iron rod: This ...
zdanman's user avatar
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Lumped model of a load and source connected by two long paralel wires

I want to understand how to skecth an equivalent circuit model circuit composed of a load (resistor to make it simple) connected to a soruce bia two long paralel wires. Take the following figure as a ...
Santi Ospina's user avatar
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1 answer
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NEMA Coil "Sealed Current"

I am trying to select a relay to interface between a temperature controller output and a NEMA size 4 120VAC contactor coil. According to the NEMA spec, a 120VAC, size 4 has a 8.3A inrush current and ...
john8791's user avatar
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1 answer
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Looking for datasheet of Toshiba T2742 integrated circuit [closed]

I'm looking for datasheet for Toshiba T2742 Integrated circuit. IC is used in old car with tachometer sensor, probably as AFE (Analog Front End). Tachometer sensor is a inductance proximity sensor, ...
pio's user avatar
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2 answers
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Potential problems with disconnecting resistive load from transformer

Lets say I have a setup where an AC transformer is outputting 50 Amps at 240 volts from the secondary for some other process and I add an additional purely resistive load that pulls 100 amps at 240 ...
realm god's user avatar
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Simulate or Calculate Inductor Flyback Voltage from Component Parameters?

simulate this circuit – Schematic created using CircuitLab Top circuit can be used to simulate the increase in velocity of the JATO Powered Chevy featured in the first episode (and subsequent ...
SystemTheory's user avatar
2 votes
2 answers
120 views

Why will a connector add some inductance if it is soldered or not?

According to this AN : I do not understand how the inductance can reduce if the connector is soldered or not. I mean the length of the "traces" will not change. I agree that the resistance ...
Jess's user avatar
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When the depth of a conductor is sufficiently large, is the reactance equal to the resistance? [closed]

Is the reactance in a conductor approximately equal to the resistance in a conductor when the depth is very large? If so, why? I'm struggling to understand the concepts behind this. I believe it has ...
elvishpotato's user avatar
0 votes
3 answers
147 views

How are modern ACDC power supplies desgined?

I wonder about how exactly modern, but mundane ACDC power supplies (your phone power supply) are designed. Maybe my misunderstanding comes from one of the following assumptions: Modern AC-DCs ...
Niclas's user avatar
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1 answer
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Transient analysis with charged and uncharged inductor in series

I have to do transient analysis in the following circuit. When t<0. L2 inductor is effectively bypassed and 10A flows through inductor L1. At t = 0+ L1 behaves as a current source outputting 10A ...
rjpj1998's user avatar
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1 answer
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3 phase motor in Steinmetz connection on a single phase supply direction change problem

I want to run a 3 phase induction motor on a single phase power supply. I'm aware of the low operating power & low starting torque in this configuration. My load & duty cycles are also not big,...
icyGuy's user avatar
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pspice equivalent inductance calculation

I want to implement an equivalent inductance circuit with the pspice program. The circuit-wide inductance in the first picture is 2m I think. So I implemented and checked the equivalent inductance ...
mouin's user avatar
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Constructing an AC clamp ammeter

How many turns needed on a donut ferrite core to produce 5 volts when one conductor of a 240 volt AC cable is threaded through it? What size of ferrite should I use and what diameter of wire?. I'll ...
Silvosa's user avatar
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1 answer
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Sense induced current in coil near AC mains 240 volt

My heater has no indicator to let me know that its switched on and using power. Sometimes I forget that its switched on. If I (safely) put a coil near one of the conductors (away from the other ...
Silvosa's user avatar
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1 vote
2 answers
389 views

Flyback vs. Coupled inductors vs. Transformer?

So I am in the process of making a high voltage power supply and after a failed attempt at using a modified MOT and difficulties finding a flyback transformer, also difficulties understanding how they ...
leasthollow's user avatar
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90 views

Calculating inductance of solenoid using a resonant RLC circuit

I tried to perform an experiment in my school physics lab with an RLC circuit. I plotted the variation of the voltage across the resistor against the frequency of the source. From the figure below, it ...
Shreya Anish's user avatar
1 vote
1 answer
71 views

An active inductor connected to an inactive inductor in series

I am a grade 12th student studying about inductors and RLC circuits for the first time. While studying I got stuck with the idea of an active inductor being connected to an inactive inductor. ...
Anirudh Panguluri's user avatar
3 votes
2 answers
122 views

Derive a State-Space Model for an Electric Circuit with three Energy Storage Components

I want to model the shown circuit diagram with a state-space model. However, I cant solve it since I obtain four unknown variables while only three of the derived equations are linear independent. ...
Chris's user avatar
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Calculate inductance of a coil with an iron core inside

I want to calculate inductance of a coil with an iron core inside. The iron core is not vertically centered, but it is still aligned along the axis of the coil. I know that FEMM softwares and ...
MohammadAli Zeraatkar's user avatar
3 votes
1 answer
210 views

Time-Varying Inductance in Electrical Systems

How to derive and solve equations for electrical systems when the inductance of an inductor is not constant and changes over time? I'm familiar with the standard equations like E = 1/2Li^2 or V = Ldi/...
MohammadAli Zeraatkar's user avatar
1 vote
1 answer
125 views

Inductance of Transformer

I am trying to calculate the inductance for the KA4823-CL Transformer. According to the datasheet it is 28uH. I know that they use a 3C90 RM14 ferrite core and 6 windings on the primary. As I was ...
Jenny's user avatar
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1 vote
1 answer
153 views

How to choose the right inductor current limit for buck converter?

While learning and trying to make my first two-phase buck converter to power some servos, I found 2 x 3.3 uH inductors are needed for an application that will draw 30A (15A each). The problem is that ...
Mito's user avatar
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0 votes
1 answer
120 views

Measuring CCM Boost PFC Inductance

I have not done this measurement before, so, I would like to ask for help setting up a test to measure the boost inductance within a 3kW CCM Boost (thought I would say it again...) PFC. Some ...
RogerDodger's user avatar
3 votes
3 answers
332 views

Why is inductive coupling negligible at low frequencies?

I've been reading some papers from the early telephone era. I see a lot of statements thrown around like "crosstalk at low or voice frequencies, where inductive coupling is negligible..." ...
Rydberg's user avatar
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2 votes
3 answers
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Why is Thevenin Voltage of this circuit equal to the voltage source?

I am well aware that Thevenin voltage is equal to the open circuit voltage at the end of the circuit. The circuit information are: \$𝐕_𝐴\$=50∠0 V, \$𝐈_𝐡\$=5∠0 A, \$𝑅_1\$=10 Ξ©, \$𝑅_2=10\$ Ξ©, and ...
RK Eshat's user avatar
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What is the equivalent DC motor inductance for a BLDC motor is phase-to-phase inductance is known?

Suppose I have a 3-phase BLDC motor, and I am provided/can measure the phase-to-phase inductance. If I would like to model this BLDC motor as a standard voltage controlled DC motor, what is the ...
ITregear's user avatar
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2 answers
86 views

Can I use twinaxial cable while still on the spool?

I have 500ft of shielded twinaxial cable (belden 9463) on a spool and need to do a distance test on a product I'm developing. Is it worth unraveling the spool to get rid of any EMI from my spool of ...
aclark's user avatar
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0 votes
1 answer
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Does a Tesla coil's secondary parasitic capacitance and top load capacitance add up?

I came to this question recently and suppose it's true that the secondary's parasitic capacitance does indeed add up with the value of the top load's capacitance, but I really want to hear someone ...
Roman's user avatar
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0 votes
3 answers
110 views

Pin inductance vs pin capacitance in determining rise and fall times

I am a beginner in digital electronics and VLSI. I know that pin capacitance is an important parameter in determining the rise and fall times of logic gates and ICs. This is supported by my intuition ...
Jishnu Das's user avatar
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0 answers
71 views

How to find the secondary inductance of the Motor if Ld, Lq, flux linkage, frequency, speed, rotor, and voltage details are known?

Precisely, the question. Is there any formula for this?
Harshil's user avatar
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1 answer
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Problem evaluating the current function over a time interval in circuit with inductance

The given expression describes a piecewise function of voltage u(t) across a circuit element with respect to time and is defined over four intervals: $$ u(t)= \begin{cases} V_{0} \frac{t}{(2T)} &\...
Homer Jay Simpson's user avatar
1 vote
2 answers
187 views

How does the power transistor with antiparallel diode behave?

Let's say I have a transistor with an antiparallel diode in a circuit with inductance. Now suppose that the antiparallel diode conducts an intertial current of the inductance \$i_L\$. During this ...
Steve's user avatar
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