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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What are the DOs and DON'Ts for the inductor? [closed]
What are the DOs and DON'Ts of the inductor
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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 ...
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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 ...
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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 ...
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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 ...
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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?
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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)} &\...
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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 ...
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KVL contradiction in LC circuit
Let's write down KVL in direction of current flow for an LC circuit.
We have 2 cases:
a) \$-\frac{q}{c} + L\frac{dI}{dt} = 0\$, which is wrong.
b) \$\frac{q}{c} + L\frac{dI}{dt} = 0\$, which is the ...
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Connecting bulk capacitor board via header or standoff?
I am routing a 2 board design that are stacked on the top of each other. The lower board (inverter board) contain the power transistors and a separate board contain the bulk DC-link capacitors for the ...
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Is this a non-inductive ceramic resistor?
I found some resistors in my stash which are similar to those ceramic resistors advertised as non-inductive resistor on the internet:
Is this a non-inductive ceramic resistor?
How do I determine the ...
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What is the flux linkage or inductance or induced voltage per unit length of the hollow tube conductor surrounding the inner conductor?
What is the flux linkage or inductance or induced voltage per unit length of the hollow tube conductor surrounding the inner conductor in some section due to the current in the inner thin conductor?
...
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Methods of reducing time constant for an LR circuit
Given a circuit/system with inductance and resistance, a certain time constant can be calculated for reaching maximum current.
Is the time constant calculated as 63% of the maximum current?
if L and ...
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Why do two similar core, same wire wound inductors have vastly different values?
I wound 2 inductors with similar wire (22 AWG, copper). They have 25 turns each. The cores I bought are similar.
One inductor has a value of 1.8 mH and the other one has a value of 3.7 mH:
What's ...
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How to find resistance, inductance, and capacitance of a load/device
I'm planning to make a proper simulation of a circuit. Before the simulation, I need information about the load (resistance, inductance, and capacitance).
Example: the load is a CPU. range of wattage ...
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How does capacitive loading and inductive loading differ from resistive load?
A voltage source is loaded when current is drawn from it. Usually we have voltage sources in circuits and not current sources. A resistive load draws current from a voltage source that is a function ...
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What's the relation between SWG, input & output VA, cross sectional area, number of turns of an isolation transformer?
I made 3-4 transformers before and learnt a lot about transformers, I didn't have a formula so I was following heuristic approach to resort to the right SWG and right number of turns, however this ...
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Parallel decoupling capacitors: Is inductance reduced?
Background
In general, when placing decoupling capacitors in parallel, their capacitances add and their compound ESR is reduced (like for parallel resistors). But I am a bit uncertain if/how this ...
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What does the "impedance" value of audio transformers specifically mean in terms of inductance?
So I've searched the web, looked into other questions here (e.g. this one), but I am not really any wiser.
What does the impedance of a transformer specifically mean? I.e. how can I deduce the ...
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Intuition about inductor/transformer core shape nomenclature and performance impact
Due to some future projects, I feel I have to get more accustomed to winding my own transformers/inductors, so I have been reading about ferrite cores lately. One thing I can't really develop a ...
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MOSFET driver circuit for inductive load
In our experiments, we use coils to generate magnetic fields. In order to have a stable magnetic field, we actively regulate the current in the coil (typically between 10 to 60 A) by using a PID and ...
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Coil for biggest EMF
I have a short (<1 s) pulse output that will be around 20 kV. Frequency is around 100-200 kHz. How would I make a coil that induces the biggest electromagnetic force (to radiate and mess with the ...
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Step-Up Transformer parameters
Currently I am tinkering on a project including a high-voltage output.
My current design is:
Use a power-op amp (OPA547 Datasheet ) with +-24V-Rails at x4 non-inverting gain and feed it with a +-5V ...
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MOSFET is getting very hot at high frequency PWM
I want to drive a Litz wire coil at 250 kHz. I chose Arduino initially and then replaced it with NE555, but the Arduino or NE555 is generating 250 kHz, which is fed in a Litz coil to turn on some LED ...
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Unsure where to start with AC circuit analysis (RLC)?
Here's what I do when I see a problem like this one below:
On the left side of the circuit I see resistors in parallel, I calculate 1/20 + 1/20 and then take the inverse. Then I add the 10 Ω resistor ...
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Air core inductor impedance vs frequency graphs
I wanted an inductor with at least 100 μH, so I used a PVC pipe and some enamelled wire (AWG 21 if I recall correctly) to create an inductor. The inductor does serve its purpose fine as a load ...
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What difference will these two coils have when it comes to charging a 3.7 V, 300 mAh battery?
Coil 1:
22 × 12 × 0.87 mm, 27.9 μH, 1.21 Ω
Coil 2:
30 × 10 × 0.52 mm, 12.8 μH, 1.27 Ω
The specification sheets for both says they are rated for 2 W maximum.
Now that got me confused. If both are 2 W ...
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Calculate multi-layer coil inductance
I tried to calculate the inductance of an existing multi-layer air core. Since it is covered in some kind of insulating tape I cannot see the coil form or the actual extent of the coil.
Some data:
...
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How does a cheap RLC meter eliminate resistance from a measured inductance?
I bought a very cheap RLC meter, mainly to measure inductance. It has a single LCD display, so it shows only one value at a time, unlike more expensive RLC meters that measure both inductance and ...
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How to find the points between which EMF is induced in a loop with resistors?
I recently came across a problem on Faraday's law, which had multiple resistors. The circuit looked something like this, with the loop rotating clockwise.
Personally, I felt that there would be three ...
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On Induction retardation
I'm an amateur/beginner, (maybe asking somewhat advanced questions) following a rather unorthodox learning curve, so please provide context if you can.
I'm curious about the retardation of the pick-up ...
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How to measure the leakage inductance of LLC Split bobbin transformer with two auxiliary windings
Let’s say I am having ETD core and split bobbin for LLC Design
I have 4 windings in that transformer
primary
secondary
primary aux
secondary aux
I am winding the primary and primary aux windings in ...
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How do I deal with this strange inductor?
I'm trying to solve for the equivalent inductance between terminals a and b but there's this 2 Henry inductor on the top right that doesn't fit with the basic rules of series and parallel connections. ...
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What is the signifance of parallel/series inductance/capacitance measurements on RLC meter?
The RLC meter I use includes these measurements: serial inductance, parallel inductance, serial capacitance, and parallel capacitance.
What are their differences, and how are they important ...
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Calculation of IC driver resistance, gate resistance, and inductor value
I want to use a UC3843 PWM controller to drive a IRF2305 MOSFET (in a Ćuk converter).
How can I calculate the resistor values for the IC input pin (pin 7) and the MOSFET gate?
For example, in the IC ...
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Doubling the length of a solenoid doubles its inductance. Two identical solenoids in series have up to four times the inductance due to M. Why?
The inductance of a long solenoid with \$N_o\$ turns and a length \$l_o\$ is
$$L_o=\pi r^2 \mu_0\frac{N_o^2}{l_o}$$
If I now make a new solenoid, \$L_{new}\$, with double the length of the original (\$...
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Centre-tapped-secondary transformer's primary leakage
I hope the title is explanatory enough.
The following is the practical model of a transformer having a centre-tapped secondary (eddy and hysteresis losses, and parasitic caps are omitted):
Img src: ...
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How is primary defined for FL2015-3L?
The FL2015-3L transformer has a datasheet (https://www.coilcraft.com/getmedia/6651db01-d153-47d9-8a27-4758c28bff0d/fl.pdf), which says its inductance is 19uH with a note that it is measured across ...
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Could someone explain why reactive components like the inductor and capacitor are needed in circuit? Can't they be avoided? [closed]
I just don't get why they the inductor can't be avoided. It's this same Device that causes reactive power.
Could someone explain why reactive components like the inductor and capacitor are needed in ...
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How to calculate the maximum flux density or max inductance of a ferromagnetic material of cross sectional area A and length l?
I am doing an experiment where I am making a power transformer where I am keeping the cross sectional area of primary leg and secondary leg different. I don't want the primary leg to hold more than a ...
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Measure inductance of air core inductor
I am making an inductor
Air core
Wire: 18 AWG guage
Turns: (I am not sure ) but could be about 6000 turns
The weight of the wire : 400 gram
The coil wrapped by machine
Coil is 5 cm
Diameter of core ...
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Can I rewind a 4-pole motor to be a 2-pole motor with the same design voltage? [duplicate]
I had a 4-pole motor whose winding was irreversibly damaged and I had to cut it off.
I was planning on rewinding it exactly as it was (I measured everything before cutting off), but then I stopped to ...
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Calculate the number of turns in air core inductor
Coil specification:
Air core coil
Length 790 mm
Diameter 290 mm
Wire guage 18 - 1 mm diameter
I need the number of turns to get an inductance of 150 mH.
While searching for calculating the number of ...
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Toroid inductor correction factor
Various equations and online calculators for the inductance of a wound toroid only include a parameter for the number of turns, not how the turns are wound (example). But the answer to this question, ...
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Why does the signal and power supply in my custom ESC breadboard become so noisy when the motor is rotating?
I am building a custom ESC to drive my BLDC motor. The motor spins in open loop and I want to debug the back-EMF detection circuit, but as soon as the motor spins, the signal line of the MCU (MCU uses ...
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Designing an RC snubber for AC solenoid lock (inductive load)
I am designing an AC solenoid lock. Here is my design:
Resistance 8 Ω
Main outlet power source 220 V - 50 Hz
Inductance 150 mH
Impedance 47 Ω
I (RMS) ~ 5 A
I read that the inductive load needs a ...
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Eddy-current input to op-amp misses reading at times
The problem is only in the input stage of the op-amp.
Edited: removed reference to "eddy-current" and changed to "reluctance".
The reluctance-current is generated from two coils by ...
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How does PWM frequency influence the inductance of a DC motor? [duplicate]
I have read in this white paper that "Since the motor inductance varies depending on the PWM frequency, at typical PWM frequency of 50 kHz, the inductance may decrease to as low as 70% of the ...
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Question - LC Tank - Resonance , Duty Cycle , Back EMF
I was wondering about that for some time now but didn't have the time to try it myself , maybe some of you guys will help me out with this question :
What happens when LC Tank is operated in its ...
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Component identification from Bluetooth module
I have this small component salvaged from a broken bluetooth module, and I need to find what is it and its value. My assumption based on the pictures I am posting you is that it is an SMD inductor.
If ...
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