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 ...

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Circuit with coupled inductors, need help with mesh equations

Are the mesh eqations in the image below correct? It gets a little tricky with the mutual inductance and my textbook gives no solution (American textbooks..). Click the image below for a larger view. ...
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34 views

How to understand voltage change between different phases of BLDC?

Actually, it is a question about an application note of BLDC from here. (on page 30 of that material) The question is about calculation of potential of M. What I learned from book is that the ...
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5answers
447 views

Why does a capacitor act like a short-circuit during a current impulse?

While trying to solve questions involving impulses and step functions, we are supposed to assume that an uncharged capacitor or an uncharged inductor acts as a short circuit and open-circuit ...
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1answer
33 views

Measuring self-capacitance of coils

Is there a simple way of measuring the self-capacitance of a coil? There are many estimates out there for self-capacitance based on number of turns and wire specs, but I'm wondering if I can do an ...
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2answers
50 views

What means coil inductance (h) for relays?

I'm looking at the data-sheet for a Single Coil Latched Relay. In there, i see the Coil Inductance (ref. value)(H) for Armature ON and OFF column. Specs: Rated ...
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4answers
70 views

Avoid inductive coupling on two near coils

I have two coils that are placed parallel from each other and separated by a mere 1.5cm, lets say A and B. The core of them is built using soft iron. Right now they are wired and built in the same ...
2
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2answers
88 views

How solder inductance affects RF circuits?

I'm assembling a VHF oscillator (90 MHz) and plan to reach UHF and SHF some day. Should I worry about solder inductance affecting an oscillator performance? If no, then when should I take it into ...
3
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1answer
129 views

Why do inductors release a high voltage when disconnected

I take a 12 volt battery, take a strong electromagnet, and fire it up. I then touch the two terminals that are currently connected, one terminal of the battery, and one terminal of the electromagnet. ...
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2answers
103 views

RL circuit paradox [closed]

I can't understand why current flow through an inductor in RL circuit if this inductor induces EMF to block it? Well, the current at t=0 is 0 but how the current increases seems to be paradoxal :( ...
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2answers
135 views

How does a flyback diode work?

In a previous question I posted to the exchange I asked for some instructions on trying to variable speed control a motor. Someone suggested utilizing PWM from my Arduino to open and close a ...
4
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2answers
88 views

Crosstalk between secondary transformer windings

I have hand wound a transformer which has a 220v primary winding, two 25v secondaries and a 15v secondary: simulate this circuit – Schematic created using CircuitLab I have centre tapped ...
16
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2answers
772 views

Why don't typical digital multimeters measure inductance?

Even with predominantly digital circuits, I am using inductors much more often than I used to, generally because of all the buck or boost converters (a recent board I was involved in has 12 different ...
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0answers
64 views

What physical meaning does the dot convention for inductors/transformers have? [duplicate]

I never understood what the physical description of the dot on/below the inductor is. Does it have any significance in the organization/connection of the inductors? More specifically: Does how the ...
3
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2answers
76 views

Inductance in Power cords

Why doesn't the Inductance/Capacitance of Laptop charging wires and other appliances effect the performance of the devices/ power supplies? An inductance would be introduced if the wires are lying in ...
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1answer
34 views

Replace Current controlled Voltage Source Converter with Rectifier Diodes in ELC?

In this paper an Electronic Load Controller (ELC) for two (2) parallel generators is designed. I wish to omit the second generator and hope for simplification. Now two questions arose: (while I ...
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1answer
183 views

How do “Wire Wound Chip Inductors” work [closed]

I have a police scanner that has a couple of modules in it. One of these modules is marked 390G (Data Sheet) I can't see the other modules number but it looks identical. I know they are NOT the ...
3
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2answers
95 views

Telegrapher's equations

Something about the derivation of Telegrapher's equation is really bugging me. When deriving the Telgrapher's equations for a transmission line using a model as shown above, why do we only use a ...
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0answers
67 views

Equivalent Resistance

I'm working on the following homework problem. (Yes, this is homework. :p ) I'm supposed to find the current through L1 as a function of time. simulate this circuit – Schematic created ...
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0answers
86 views

Ground plane and magnets

I am making a wheel encoder out of a Hall Effect sensor with magnets in a concentric circle on the wheel. The Hall effect sensor is on a 2-layer 9x5mm pcb. I usually fill in the layers by drawing a ...
1
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1answer
49 views

Is RL-AC circuit's current higher at the first time?

I've solved the differential equation of the current function of RL-AC circuit. And then I've checked the plot(graph) and found that the first period of the current is higher. Why is this happen? ...
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0answers
105 views

LTspice: How to make a time-variant mutual inductance coefficient in transformer model

I would like to make a transformer model with a time-variant mutual inductance coefficient. Does it work at (K1 L1 L2 var)?
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3answers
2k views

How can I calculate the inductance of the primary of a transformer given a specific load on the secondary?

Inductance in the primary of a transformer decreases as the load on the secondary increases. How can I calculate the inductance of the primary coil? What if it was step up or one to one ratio?
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1answer
132 views

How susceptive is an inductor to frequency and current?

According to Coilcraft - Testing Inductors at Application Frequencies the inductance of a coil changes with frequency and current. Most datasheets don't give a frequency-inductance plot and ...
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2answers
155 views

Diode + Inductance circuit

By electrical analogy (force->current) with a mechanical system, I have reached an electrical circuit which is as follows: It consists of a current source and a (diode + inductance in series) in ...
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2answers
210 views

Current transformer as Sensor, can it sense rectified DC current?

I have been using an inductor around a 230V AC wire ground-side of the switch to check for current in a wire, it is part of control mechanism. I have to add a rectifier now, so occasionally the ...
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2answers
1k views

What is killing my MOSFETs

This is my first post here on electronics stackexchange. I am a hobbyits in electronics, and a professional in programming. I am working on a inductor circuit to heat a workpiece. I have a working ...
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2answers
129 views

inductance wiretap

I am trying to create a wire-tap for ethernet cables by modifying a classic phone wiretap which uses inductance. I haven't studied this in quite some time and need to come up with a solution for a ...
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4answers
168 views

Rectifying induced current without using any semiconductors

Consider a 1:1 transformer. Short DC pulses are applied to the primary (input) coil. Once it's positive current pulse, once it's negative current. It's not strict alternating current (i.e. two ...
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2answers
102 views

inductance of metal line in IC

I'm designing a metal line in integrated cicruit which will be connected to AC voltage source in one end and transistor load in the other end. How can i calculate the inductance of the metal line (6 ...
18
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2answers
1k views

What is saturation in an inductor

I have heard a lot of the time that "the core is not large enough to handle the current, and will reach saturation". What is saturation and why is it a bad thing to reach saturation?
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2answers
75 views

Find the current in the circuit after 20s if the initial current was 0

An inductor in an electric circuit is essentially a coil of wire in which the voltage is affected by a changing current. By definition, the voltage caused by the changing current is given by ...
2
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2answers
181 views

Wireless transmission of energy through a layer of non-conductive material

Is it possible to effectively transmit energy by electromagnetical induction? I have a plate of nonconductive material (5-10 mm) and I would like to transfer electrical energy from circuit on one side ...
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1answer
1k views

Controlling an electromagnet strengh with arduino

This previous question Controlling an electromagnet with Arduino deals with binary control (ON or OFF) only. On my side I need to choose the strength of the magnetic field. It is a home made ...
7
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3answers
2k views

How to wind a toroid for 170 uH Inductor

I am planning on buying a toroid core from Digi-Key. I want to be sure that this is the right type and that I can achieve 170 uh inductance with 22-18 AWG wire. How can I wind this and what is the ...
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1answer
112 views

R-L Transients Storage Phase: “Inductors” Help?

The below expression is for finding the induced voltage across the coil (inductor) at a certain Time Interval. Furthermore, the additional expressions are to find the induced voltage at 1T and 5T. I ...
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1answer
155 views

calculating inductance formula

what is the formula for caculating inductance on the basis of 1)No of turns. 2)Diameter of the wire 3)Diameter of the wounded circle. ? how to calculate the capacitance value in ceramic capacitor ...
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4answers
1k views

How do I select the correct inductor value for the following buck regulator?

First of all, I suck a bit at math, and I'm no electronics genius, so the stuff I do is for fun and for learning purposes... I'm working on a buck converter circuit to convert my USB Vbus 5V to 3.3V. ...
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1answer
215 views

Proposal for building Low-Current 220VAC Current Detector

I have been reading many such articles and have found no way to simply detect flow through a mains wire at low current. At .27A for one LightBulb, I was calculating .05mA out of commercial 1:2000 ...
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1answer
97 views

Name for circuit with multiple paths with aim of reducing inductance

Trying to find the best way of describing a circuit that uses multiple separate physical paths to reduce effect of inductance on by HF signals. Is there a term for such?
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1answer
1k views

Simulating real world transformer with LTSpice

I'm studying LTSpice, and I'm playing in transformer simulation. I want to modelize a real world power line transformer in a reasonable way: I mean I don't need an exact simulation of some specific ...
1
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1answer
69 views

Capacitive pen input sensors on screen edge

I've got a couple Kobo Touch devices in my possession. I've recently started hacking on the software. I'd love to enable stylus input by putting a Wacom or similar tablet behind the screen, but I ...
3
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2answers
766 views

PCB Trace inductance

I am planning to do a high current (200A+) PWM in a PCB and I am afraid the PCB traces inductances will be a huge problem...so I have some questions: 1- How may calculate the trace inductance? 2- As ...
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1answer
147 views

circuit equations derivation problem

I'm trying to derive from scratch the differential equations that characterise Chua's circuit. Here are the ODEs I obtain from that diagram. Current is positive if conventional current goes + ...
7
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2answers
347 views

Transformers as Inductors (Weird Results)

If a transformer's primary and secondary are connected in series, then the total inductance of the result, is greater than the summation of each coil separately. That is to say: \$ L_{total} > ...
3
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6answers
3k views

how a phase delay occurs in capacitors/inductors with visual images

Capacitors provide a phase delay between the current and voltage. Current leads the voltage by 90 degree. I was taught these only with the equations. But I want visual intuition, what happens in the ...
21
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2answers
2k views

Why are lightbulbs considered resistive load?

A lightbulb (a plain old incandescent lamp) is typically brought up as an example of resistive load. Yet the filament is actually made of several feet of very thin wire cleverly coiled to form a ...
2
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1answer
644 views

How to determine the force of a solenoid based on inductance

I'm looking to potentially build my own small solenoids, I thought perhaps that I could take an Air core inductor, a spring, piece of plastic, and conductive core and build my own. Is there a way to ...
0
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1answer
1k views

What is the inverse of the inductance?

That's for a homework. I'm asking what is 1/L, where L is inductance? I mean, as the inverse of the resistance is conductance, what is the inverse of the inductance.
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1answer
192 views

Inductance of a HDD BLDC Motor Phase

So I have set up a little experiment which involves a HDD BLDC Motor, a scope and a multimeter. Pretty simple, I know. Is it possible to determine the inductance of a phase by the voltage the phase ...
6
votes
3answers
696 views

Long transmission line inductance with SPI

I have a PCI 5V GPIO card which bit-bangs SPI over a 10-foot cable. The SPI clock is running at 800Khz. The cable connects to a board and the SPI lines feed directly into the SPI IC's. I know SPI is a ...