Questions tagged [induction]
Induction is the process by which the electrical or magnetic state of a body is influenced by the action of electrical or magnetic fields by proximity without contact between a “source” body and the influenced body.
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3 phase induction hob, single phase wiring [closed]
While installing this 3-phase appliance I came across these diagrams which have been bugging me a bit, therefore it would be nice to find out what is the correct way to wire this up and what is the ...
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Why does one MOSFET heat up very fast compared to the other MOSFET in this induction heater circuit?
simulate this circuit – Schematic created using CircuitLab
I'll start off by saying this project is just an experiment I'm playing around with and is not the typical ZVS design you find ...
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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 ...
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Why doesn't the cross section of a material affect flux density?
I am trying to design an inductor. I have free hand of using any geometric form and ferromagnetic material.
It's my first time doing it. I studied magnetics design in college and I always thought that ...
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H-bridge inverter with phase shift control
I am trying to apply phase shift control to my H bridge inverter but I get these spikes in the picture I don't know why. And it getting worse if I apply inductive load
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How does EMI from power cables affect analog signals in audio cables and digital signals in cables like Ethernet/HDMI/etc?
This question is for all those home theater and computer specialists out there. How does EMI from power cables affect analog signals in audio cables and digital signals in cables like Ethernet/HDMI/...
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3-phase induction motor starting current calculation
I'm trying to calculate the starting current of a motor (460 VAC @ 60 Hz) using the datasheet information I shared. Am I suppose to use the ratio given under "starting values" for current?
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Multiple 240v AC LED indicators cross-talk
I have these 230V AC indicator LEDs, which I'm using in a project to indicate when I have various switched circuits live.
Due to space constraints, the switched lives of these LEDs are routed through ...
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Does winding a solenoid around a copper pipe reduce the net magnetic flux at all?
I want to wind an air core solenoid around a copper tube. One end of the solenoid is soldered to the copper tube. (See picture above). Will a magnetic field be induced in the copper tube that cancels ...
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Why we use constant value of magnetic flux in transformers
I have a confusion regarding the formulas of the transformer. I have seen in many places people using a constant value of the flux B in the transformer equation:
turns per volt=1/(1.44 x Bmax x A x f)...
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Did I wire this AC motor properly?
I disassembled a drill to replace the chuck and when putting it back together it seems to be short-circuiting. I have doubled check the cables but they seem to be ok, so I'm afraid I may have wired it ...
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Best switching topology for axial stator with rotating field
The idea is to have a stator with coils driven by AC current not switched with DC as is done in most cases. On top of that I need the field to physically rotate around with the rotor. This essentially ...
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Want someone to review my Helmholtz coil design to see if I am missing something obvious before I fabricate it?
I am planning to construct a Helmholtz coil and wanted electrical engineers to take a look just so I know I am not overlooking anything.
The max field strength I am looking for is 200 Gauss. I ran ...
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Can wireless charging become more energy efficient?
I've stumbled upon a few articles saying that wireless charging takes more energy to charge something compared to the cable. Like this one.
Like in the test from the article, it takes 47.33 % more ...
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Help in understanding poor temperature stability of an induction proximity sensor circuit
I have been experimenting with a circuit for an induction proximity sensor, that was reverse engineered in the following post:
Help with reverse engineering a small PCB
I have built the circuit, but ...
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Why doesn't an induction heater and an induction ring launcher produce the same effect?
I want to know why an induction heater and an induction ring launcher don't produce the same effect. Both seem to use AC voltage to power a solenoid(which induces a voltage in a pipe) so why doesn't ...
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Phase splitting principle of single phase induction motor
How two sinusoidal flux 90 degree out phase creates a rotating flux?
In particular if A = sin(wt) and B = -cos(wt) are two flux produced in a single phase induction motor. Then their resultant would ...
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How does the floating light bulb rotate and power off? [closed]
I am trying to understand on a high level, how famous floating light bulb actually works.
https://www.floately.com/products/volta-light-bulb
I kind of understand how it floats and how it is supplies ...
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I am winding a large induction coil but ran out of wire and need to solder or connect more wire to the existing wraps, how best to do this?
I'm winding a 6" coil with 16ga magnet wire. I want about 1600 turns but ran out of wire. What is best way to add more wire w/o creating a problem at the join, such as over-heating or creating ...
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Total newb trying to build a wireless power transfer system for terrarium water pump
I am needing to build a induction based wireless power transfer system that I can use to power a small aquarium pump through the glass base of a very tall vase. I have been researching this for about ...
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If the impedance of two coils is measured to be identical at 250.0 kHz, is it safe to assume identical impedance across the spectrum?
This question pertains to matching two air-gap inductors for use in resonant coupling. Alternative solutions are welcomed and appreciated.
The two coils shall be comprised of identical wire.
The two ...
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According to my understanding, this induction heater should be melted, but it's not. Why not?
I opened up this induction heater to find that it only has maybe 12 AWG wire in its work coil, rated for 30 A RMS. I've been doing induction heater simulations for a project, and the two topologies I'...
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Equation relating alternating magnetic field strength to induced voltage in search coil
I have a search coil (loop area A, N turns) placed normal to an alternating magnetic field with equation B(t)=Bp.sin(2.pi.f.t), B=field strength at time t, Bp=peak field strength, f=frequency, t=time. ...
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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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How would you calculate induced voltage from a radiated electric field?
This may be somewhat of a classical question based upon Radiated susceptibility testing performed in avionics qualification testing; given a given electric field strength (V/m) at a given frequency, ...
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Could actuator (DC motor) damage the relay that controls it?
I have a 12V 22A DC actuator that I turn on/off with an automotive 80A 12V relay. Could turning it on and off cause damage to relay in the long run?
I understand a diode is required on relay's control ...
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Help with AC generator
Why is the multimeter not displaying anything, if I have a copper wire next to a rotating magnet. The magnet moves at 100 RPM and the whole enameled copper wire is coiled and has a total length of 2 ...
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Heating and cooling a liquid in a test tube electronically
I am automating a small-scale laboratory chemical process. One step is thermal equilibration of DNA in about 0.5 ml of aqueous buffer, which involves raising the liquid to 90°C and then immediately ...
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Will a nuclear magnetic resonance (NMR) or magnetic resonance imaging (MRI) impulse blind our signal response sensor?
After we send an impulse to the coil, when we start read the coil will have self oscillations. What influence will the self oscillations have on the read response? How can we deal with the self ...
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Why is my inductance and resonance frequency values of my Planar pcb simulation in COMSOL varying from the TI webench calculations?
I am designing a planar pcb inductive sensor. I designed a simple planar inductive coil having 10 turns with each turn having 0.1 mm width and 0.1 mm gap between them. The coil is pretty small just 10 ...
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Role of secondary antenna for a UHF RFID tag
I am trying to understand the role of a secondary antenna that I have seen in some UHF RFID tags. I believe it's to increase the read range of the tag.
The module seems to have an internal antenna ...
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Geometry of magnetic flux in EM induction
Image of surface, shown in blue, through which magnetic flux passes, indicating the boundary in red, in motion at velocity v:
In the Wikipedia article on Magnetic Flux, it is said that an EMF is ...
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Why is the mutual inductance the same?
In this attached pictured, the solenoid with the length l and cross sectional area A is solenoid 1 and the other with length say h is solenoid 2.
Why is M₂₁ is equal to M₁₂ as my book claim?
M₂₁=N₂Φᴮ²/...
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Why is the current rate of change constant in an ideal, zero resistance coil connected to a battery?
In a RL circuit, a battery, coil, and a resistor are connected together in series. In this case after closing the switch, from KVL, we have ε-iR-Ldi/dt=0, but in an ideal situation where R=0, ε= Ldi/...
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Make an induction heater from a TIG welder
Now this question is out of my own ignorance of the product specifics & my drive to keep the number of equipments streamlined & to a minimum.
See, I want a TIG welder for a long time now & ...
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Induced EMF in wireless LED
I have already asked this question here but this may be a better place.
I have built the following circuit to power a wireless LED but my calculations and measurements do not give the same values. I ...
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Induction heater short circuit
I see a short circuit in a widely used induction heater diagram.
Why does this circuit work despite the short circuit?
This circuit is widely successfully tested on youtube and I want to make it too, ...
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Electromagnetic induction metal detection circuit
I am trying to develop a metal detector for use in a minesweeper competition. I aim to use a coil based metal detector because it has a long range and can detect underground metals.
There was a ...
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Across which terminals is EMF induced in this circuit?
If I were to place a circuit such as this in a changing magnetic field, across which terminals would an EMF be induced? If the field were into the plane
My intuition suggests across all wires lying ...
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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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Power 3 V or 5 V device only when AC device (induction plate) consumes power
I have a 5 V circuit with an Arduino using a current sensor (ZMCT103C) to monitor when an induction plate is in use, and then power on the ventilation (range hood).
The 5 V circuit is powered by an AC-...
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Toroidal coil as current sensor
Is there a simple way to estimate the amount of flux that is caught by a toroid coil (filled by some core material, like powder iron for example), which surrounds a straight wire with a current ...
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White residue on circuit board
What is this white powder on my induction cooker hob? Is is metal salt? The capacitor recently melted
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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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Induction coil power transfer
So I'm a big fan of building models and one issue we run into is managing to run and hide wiring through the model to power the LEDs.
Now I have read a little about inductive coil transfer and how it ...
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Why this motor shows delta 220 / star 380 which is usually the other way round from what I know? [closed]
Brand new induction motor arrived in the factory,it comes with gearbox on top controlled by VFD, but I could not understand it's nameplate, it should have shown just delta / star without voltage ...
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What is the effect of the capacitor on the input power and torque of permanent split capacitor (PSC) single phase induction motor?
I need to know the effect of the capacitor on the input power and torque of a permanent split capacitor (PSC) single phase induction motor.
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Does the diameter of a coil affect the voltage it generates when a magnetic field passes it?
If two wires of equal length (let's say 1m) are wound with different diameters (3cm and 6cm) to form a coil, if equal alternating magnetic fields passes through both of them, will they generate the ...
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Single wire electrodynamic pickup preamplifier (transformerless ribbon mic)
I'm currently working on an experimental string musical instrument. It isn't my invention though. The source of inspiration called Dvina has an unusual pickup system. It senses the current induced in ...
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Induced voltage in loop around wire in home AC circuit
I have an electric patio heater that has no indication of whether it's on or off. I want to wrap a loop of wire around its power cord, the goal being to induce a current that can power an LED to tell ...
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