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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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Flux and inductance in simple motor

This is the front view of a cylindrical motor of depth (or height) \$D\$. There are three windings: \$\alpha\$ (stator), \$\beta\$ (stator) and \$\gamma\$ (rotor): Considering the core to be of ...
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How to convert capacitor start motor to capacitor run motor [on hold]

how to convert capacitor start motor to capacitor run motor.
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Is it possible to determine a low power isolation transformer maximum output current?

I have a transformer (no codes) 240vac to 12vac this is easy enough to determine but what about the maximum current? 1) I could load it until the voltage drops but to what exactly? 2) Is there any ...
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Resultant voltage function through two opposing coils with mutual inductance

So my question is about the type of relationship in a particular circuit. I would like to know if it is linear or something else like a power. The circuit in question is a pair of adjacent, mutually ...
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Imaginary Capacitance and Imaginary Inductance interpretation and relations with circuit theory

Today I came across with Complex Capacitances and Inductances for the first time: $$L(j\omega)=L_{real}+jL_{imaginary}$$ $$C(j\omega)=C_{real}+jC_{imaginary}$$ So I started looking at their meaning ...
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100 views

Are my calculations wrong?

So I'm trying to make relatively a large square coil antenna that will operate at 125kHz frequency. The width and height of antenna are 300mm (30cm) and wire diameter is AWG24 (0.51mm) and I'd like ...
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47 views

Parasitic Inductance

when we say that in a wire there is a parasitic inductance, what is its cause? Is it the skin effect of the wire, the magnetic flux (generated by the current) through the surface of the total circuit ...
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44 views

Maximum ringing due to inductive coupling

Consider a bundle of wires carrying binary data and the worst case (or almost-worst case) scenario of them switching all at the same time. The wires with their partial mutual inductances would be ...
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Parallel inductive coupling approximation - coupling coefficient

I have the problem of a few independent current loops (wires) that on a portion of the circuit are close to one another so there will be inductive coupling between them. Each wire, on the portion of ...
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What really causes series inductance of capacitors?

Doing some research in selecting capacitors for high frequency applications, concept of equivalent series inductance comes up a lot. Apparently all capacitors have this parasitic inductance which ...
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57 views

Current through an inductor

Assume we have an inductor with the following values: $$B=B_0 \cdot sin(2\cdot \pi \cdot f \cdot t)$$ $$N=10$$ $$r=5cm$$ $$B_0 = 2mT$$ $$f=50Hz$$ $$R=5 \Omega $$ How much current runs through the ...
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What causes the residual magnetic flux when the current is zero in an inductor hysteresis curve?

An inductor with hysteresis has the following current versus flux curve: I marked the point in red where the current is reduced to zero but there is still flux on the above curve. What really causes ...
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Making sure power is supplied from a DPS5020 fast enough for an induction board to oscillate

Apologies in advance - I'm a software guy who likes to dabble here and there and my latest project is a little beyond the comfort zone. I'm building an induction heater (with off-the-shelf parts for ...
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132 views

How do transformer obey Ohm's law?

I am honestly confused, A transformer "Steps up the voltage and steps down the current" or vice versa. So how does it obey Ohm's law? for example, a transformer with a winding relation of 2:3, should ...
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Time it takes for B to go to zero with R and L given

Given that your solenoid has inductance L and resistance R with initial current I such that there is uniform B inside the coil, I would like to figure out how much time will pass before B goes to zero....
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107 views

Common mode choke parameters CAN circuitry, Split termination concept

1)I am trying to the understand the important parameters of a common mode choke that will be placed at the CANL and CANH lines of a transceiver.First parameter - Impedance as function of frequency - I'...
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135 views

Cut-off frequency in coaxial cable

The cut-off frequency of an RL circuit is described by the following equation: $$f = \frac{R}{2\pi L}$$ where R is the resistance of the circuit and L is the inductance. Applying this equation to a ...
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Best method for determining tolerances based on production data

Say I am producing a wound coil which is ultimately going to be used in a colpitt's oscillator circuit. I measure the Ls and Rs of the coil, and then install it in a ferrite and then test it in the ...
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80 views

Why does the self-inductance of a straight wire decrease when its radius increase?

I made some research on the self-inductance of a straight wire, and many sources cited “Inductance Calculations” of F.W. Grover. So I read a bit of that book but I couldn't find the answer to my ...
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How to calculate inductance (ferrite core) in a induction heater [duplicate]

this is my third tag and I´m going to accurate my question, I have builded four induction heater and only one works, I´m sure that´s because of the inductor L1, I do not know how to obtain te correct ...
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2answers
358 views

Measurement of an inductor not accurate at all

I'm trying out a method of measuring the inductance of inductors with a following circuit: I'm using a signal generator to create the input voltage, and an oscilloscope to read the output across both ...
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307 views

Is it possible to power a microcontroller via inductance from an AC power line?

I have an AC mains wire powering a pump running at 220V at 5-10A. Is it possible to wind a secondary wire around the outside of the insulation of one of the two "hot" wires (single-phase) to get low-...
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102 views

Measuring Inductance

I have been looking the number of methods to measure inductance of a coil if you don't have an LCR meter available, and I have had some difficulty. I designed and built a coil and I would like to ...
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114 views

Clarification on This Transformer Statement

Secondly, when the current starts to rise in the secondary wire, the magnetic field it generates is multiplied by the loop count. Obviously if we had lots of loops, a very small current will ...
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123 views

What does the mass term mean in the unit of inductance called the Henry?

Reduced to base SI units, one henry is the equivalent of one kilogram meter squared per second squared per ampere squared (kg m2 s-2 A-2). This does not look like the standard F = ma formula for a ...
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During the positive cycle of US AC MAINS Electricity is the secondary Voltage back EMF or in phase with the AC MAINS?

The Sine wave of AC Mains in the US starts at zero and increases to Vmax~169-Volts. in the beginning magnetic Flux Change is greatest as it is proportional to the slope of the AC Sine wave (which is ...
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100 views

Coil Area vs Core Area

Most inductance formulas seem to assume that the COIL cross sectional area is the same as the CORE cross sectional area. Many times, the coil is wound on a bobbin which slides over the core. In this ...
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32 views

Relay does not toggled to OFF sometimes

SRD-05VDC-SL-C relay does not turn to OFF sometimes. Loads - is light bulbs 220V E27. Ilyich light bulbs (tungsten filament) - work correctly. Problem in LED bulbs and fluorescent bulbs. 20% LED bulbs ...
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66 views

Inductance of planar (spiral) coil near solid copper surface

I'm working on a electromagnetic levitation system, consisting of a flat spiral (planar) inductor positioned above a solid copper surface. The planar coil is parallel to the copper surface. (Consider ...
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2answers
107 views

Scenarios where Inductor back EMF would result in damage of circuit or component

Let's say that there is a simple circuit with the following components (ignore values): LEFT: a simple power supply (assume DC) TOP: load (resistor) and inductor RIGHT: switch BOTTOM: load (resistor) ...
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1answer
149 views

DC motor H-Bridge - Snubber Cap

I have breadboarded a simple H-bridge shown further down using the mosfets linked below the schematics. The prototyping motor is a DC 12V 1A (NO LOAD) Motor Pictured below: Ultimately I ultimately ...
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90 views

How can I model and simulate a resonant inductive square spiral coil in MATLAB?

I was wondering if it was possible to model and simulate my WPT system in MATLAB to determine if my analytical calculations are correct. I want to model my system in MATLAB as I have seen on MathWorks ...
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625 views

If you have two identical but oppositely wound inductors does the inductance effectively cancel?

I was just curious if the effect inductance of a branch of a circuit would cancel if you put two identical but oppositely wound inductors in series. It's not something I have come across.But looking ...
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Dot convention inductors in series: equation confusion

So I'm really confused with mutual inductors and dot convention. If your answer is going to be a link to any website I can assure you I read them all and that only left me more confused. So here are ...
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99 views

What are the considerations for designing a capacitor bank?

I am trying to understand capacitor banks and capacitor discharge, and how to work out what I need to generate a short pulsed current. If I would like to use capacitor discharge to produce a sudden ...
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1answer
128 views

Measuring current using ACS 712 with NI DAQ 9215

I am trying to measure current from Ignition coil(12V, 4.5A). i used arduino to measure current. And it worked good. And i connected the ACS712 signal pin to NI DAQ 9215. At zero current the output ...
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1answer
113 views

Why is my RF switch catching on fire?

The pictured circuit below works nicely as a electronically switchable-gain photodiode amplifier. Except for the small issue that as it is being plugged in, U2, a fast CMOS RF switch, has a ...
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1answer
57 views

Trying to understand inductance while driving a laser module

I have a simple circuit working where I drive a laser module with a mosfet(2SK4017Q), a 10K resistor (gate-source) applying 3.3V on the mosfet gate. Mosfet drain is connected to laser module GND, and ...
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1answer
370 views

Shortening a long antenna with a capacitance

In many circumstances it is not possible to make a dipole antenna that has the optimum length of \$\lambda/2\$ (or monopole with ground plane of length \$\lambda/4\$). Car antennas are for example ...
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2answers
88 views

Modeling a long single wire in a circuit?

I'm currently trying to make a model (equivalent circuit) of a long single wire with a resistor and inductor in series. Is this a proper way to do it? What I have done: Calculating the resistance ...
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117 views

How can I make a model of a single wire CAN bus cable?

I'm currently working on a project of analyzing the latency of a CAN bus network with transceivers and without transceivers. The latency parameter here will be analyzed with the effect of bus line ...
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0answers
384 views

ignition timing light trigger current

I've built an ignition timing light, following: http://citroen.tramontana.co.hu/en/ignition/stroboscopic-timing-light here the original schematic: I've changed some components: Instead of the ...
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1answer
53 views

Confusing phasor representation

Why capacitive impedance has the magnitude \$Z_{c} = \frac{-j}{\omega C}\$ but in the phasor diagram, we represent it as a vector pointing in the upward direction?. Same is with the case of an ...
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1answer
243 views

Current limiting ballast for a transformer

So, guys, I hope you can explain to me how to calculate the necessary parameters for a ballast to limit the current on the primary side of a high voltage transformer.It is for a tesla coil project. To ...
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1answer
59 views

Emulate the wire part for inductive loop sensor

Probably a use case example would show what I am trying to do: For timing speed of service, inductive loop detection (such as used on traffic light vehicle detection) is used to track cars through a ...
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1answer
112 views

common mode choke and derating vs current

I have a CMC that has is rated at about 1kR at 100Mhz at 3A However my circuit uses only 1A. Do I need to derate my inductance since there is less current flowing through it ?
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140 views

Circuit operation and component substitution questions for stroboscopic timing light

I'm trying to make a piece of circuitry, for a tool used to set the ignition timing of my old car. I've found the schematic and description here: http://citroen.tramontana.co.hu/en/ignition/...
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1answer
54 views

Inductive Charging 2 layer coil transfer to 1 layer receiver. Any issues?

I am looking to incorporate a inductive charging mechanism into a project I’m working on. On the receiving side I only have room for a single layer coil design. For my transfer side I have more ...
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1answer
64 views

Do not understand why current flows in undamped oscillator circuit, and getting troubles in practice

I want to make my own antenna, so I started to make a generator. I found scheme below (only without a K key in the bottom) in internet, and it seems to be exactly what I was looking for. There PNP ...