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Questions tagged [induction]

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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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Apologies for the simple question, but I can't understand the energy conservation in the following scenario. I am trying to build an induction heater using a few MOSFET gates, diodes, capacitors, ...
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Suppose the RMS value of AC sinewave current current in the coil/solenoid is kept constant, but the frequency is increasing. (Might be done perhaps by adjusting the Input Voltage) What will happen ...
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When a closed circular loop is placed in a magnetic field varying uniformly with time due to change in magnetic flux EMF is induced in the loop. However between what points can that potential ...
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What will happen with power and torque if I supply simple induction motor with constant RMS current at different frequencies? Let's consider an "ideal" motor. No or very low losses (Eddy ...
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I am designing a 3D printed phone mount for my e-bike. The bike's stem has a built-in wireless charging coil that's compatible with my iPhone and charges via the bike's battery. I don't know how much ...
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I recently watched a video where a person demonstrated the spark caused by inductive kickback. He also ran a simulation of it in Falstad. What confuses me is the capacitor and resistor, which he says ...
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I have been referring research paper "Design of a Coreless Induction Furnace for Melting Iron" by M. M. Ahmed, M. Masoud and A. M. El-Sharkawy (Refer https://s3.us-east-1.amazonaws.com/...
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I am making an induction heater. MOSFETs IRFZ44N, C = 0.1 µF, R1=R2=220 Ω, L1=L2 (don’t know I made it by myself but it’s greater than the induction coil. I made it using 24 AWG wire, 30 turns around ...
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I want to first give a quick rundown to make sure my core concepts are correct. All charges produce an electric field (and to a degree a magnetic field in the form of a magnetic moment due to the ...
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This is a situation of a de-energizing transient. My question is, would a voltage appear across the switch even in the presence of the discharge resistor \$R_{2}\$? I am asking this because, I wanna ...
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When I dug out an old floor lamp, I decided to run some basic "safety" checks using a multimeter. To my surprise I measured some voltage on the lamp post and I believe that this voltage is ...
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We are performing testing of an induction furnace where the power is supplied through diode based rectifier - half bridge inverter setup to the tank circuit by means of two sets of four 2 feet long ...
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Can we generate sufficient Electricity to power household gadgets from the experiment shown https://youtu.be/qedhViY72f8?si=lB5shkVdofsKVhd_
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I have a 24V 24A brushed DC motor (from a old pump so quite big in size). It has permanent magnets on around the coils, and the coils are wound around iron. Just like many brushed DC motors it has ...
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Suppose a there is a coil which hasvelocity=0 and we can say it does not experience any force due to themagnetic field. There is no role of induced EMF in any case. If we place a stationary coil and ...
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Consider a transformer. I put a constant sine wave AC voltage through the primary circuit and a resistor on the secondary circuit. I know that the secondary voltage is proportional to change in ...
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In the circuit below because of the DC voltage source there will be no flux change on steady state of the circuit so how the LED still stays turned on if magnetic flux is not changing and no ...
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From what I understood: resonance helps achieve higher coupling coefficients in coils. What does it mean and how is it achieved?
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I want to build a Scrabble board that detects tiles placed, mainly as a one off challenge and learning experience (i.e. not a commerical product). I haven't started building yet: I'm trying to work ...
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When the coils of a transformer are perfectly coupled, the equations include only the self induced emf in the primary and the mutually induced emf in the secondary. However, when speaking of loosely ...
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Consider a conducting coil placed in a variable magnetic field. By the laws of nature, an EMF will be induced in the coil. Between which two points is the EMF induced in the coil? If we consider it to ...
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I am to calculate the running efficiency of a 3-Ph squirrel cage induction motor. I have the rated data for the motor. I have the load speed of the motor but I need output torque to calculate the ...
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In the context of transformers, it seems intuitively obvious about winding ratios; for example doubling the coils on the second winding doubles the voltage. But this seems to skip over the question of ...
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I just recently learned magnetism-coil-faraday's law and I want to do some real world problem solving. Question: Let's say a copper wire coil (20 mm dimeter (r=10 mm)) of 3 turns (N=3) is on the ...
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I am a recent EE graduate and never really understood how transformers work. I am having trouble understanding how voltage is increased at the expense of current in a step up transformer. I understand ...
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In a setting like that in an ideal transformer. An AC source connected to the primary induces an AC voltage in the secondary. Would the secondary coil have an inductive reactance in this process?
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I am surprised to not find much info on-line about the technology and communication technique that car immobilizer systems use to communicate with the transponder key. To be more specific, my 2001 ...
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Domestic induction stoves can't be used with thick aluminium or copper pans, but when I try to heat aluminium tape it does get hot. Can someone explain why this is the case?
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Consider inductor with air gap and solid metal core made from material with relative magnetic permeability 1 regardless of temperature (such as copper or aluminium). There is Air gap between coil and ...
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I cannot hear the hood vent fan running and I waste a lot of electricity. I know about lighted fan switches but they are not always found in every stove hood. Mine has no lighted fan switch. I use the ...
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I am thoroughly confused again. I am at the point of relegating electricity as a black box, a mysterious phenomena I'll never comprehend. I just saw a YouTuber build an elaborate water mill for ...
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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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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'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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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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