Questions tagged [induction]

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43 views

ZVS induction heater modules keep failing

I built several induction heaters based on the popular ZVS module available everywhere. They all work fine with a 20mm coil diameter. But the performance improve drastically with a 12mm coil ...
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2answers
64 views

What can I use to increase efficiency of inductive wireless energy transfer instead of factory manufactured ferrite plates?

The Context I am a hobbyist with no education in electrical engineering. I am working on a DIY project trying to make water resistant rechargeable bicycle lights. I am doing this as a hobby for fun ...
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1answer
42 views

Induction from AC or RMF

I'm struggling to get my head around induction motors. Specifically, from what I can see the rotating magnetic field created by the 3 phases creates flux lines which sweep across the rotor bars which ...
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1answer
89 views

Help me to understand the working of induction cooker circuit

I am new to electronics So I need help to understand the working of the induction cooker circuit. I searched on the google but could not find the simple answer. Below is the attached circuit commonly ...
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1answer
25 views

Efficiency of induced power

This is a very basic question which I can’t quite wrap my head around. Say you have a wire/coil in a magnetic field in such a way that if you apply a current in the wire it will move. So you charge up ...
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1answer
135 views

Tamper resistant induction actuator

How would one design an actuator with the following requirements: The actuator is completely isolated with no electrical contacts. Imagine a rotor encapsulated in sealed plastic cylinder. The rotor ...
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1answer
70 views

Electrical induction at a distance through coils for an LED night light

I have 3 decorative candle based night lights, and as an enthusiast project I decided to use LEDs instead of candles to modernize them and make them cooler. I don't want to use batteries, and I want ...
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1answer
74 views

AC Induction Motor Constant Speed Control without Tachometer

I want to run the AC induction Motor at a constant speed with LOAD also without Load. So I am controlling motor speed by TRIAC. I can control the motor speed, but my problem is:- I don't have a ...
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2answers
82 views

Why the current flowing through an induction heater increases when something is heated up?

I think the whole question lies on the title. I can't understand how the material put inside the coil affects the total current drawn.
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1answer
86 views

How can we calculate the force of attraction between a coil and a ferromagnetic object?

As the question states I’m trying to figure out how I can calculate the force of attraction between the magnetic field of a solenoid (coil) and a ferromagnetic object. I suppose we should somehow ...
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3answers
68 views

What would happen if we provide a DC voltage to a transformer?

I've read that you can use a transformer to step up or step down the voltage when the voltage is AC(i.e. the average value of voltage is 0). What would happen if the average value is not zero?
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34 views

How to calculate the power requirement of an inverter to work an induction cooktop?

I am trying to maximise the use of power generated using solar panels at my home. During day time there is not much load except of fridge. So I thought of using the induction cook top on the 1.5KVA / ...
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2answers
59 views

Hand contacting op amp photodiode circuit causes interference - what ist the physic behind it?

I am new to analogue electronics and I am still learning about op-amps. I use the most common circuit for amplifying a photodiode's signal to measure it with an ADC: Amplification gain is 1M, the ...
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0answers
29 views

measuring wireless (inductive) power supplies

I bought an electric toothbrush with a lithium-ion battery and wireless (inductive) charger. It came with one of those air/water jet flossing accessories, which also has a lithium-ion battery and a ...
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0answers
38 views

Wind Turbine Generator Types [closed]

I am curious about wind turbine generator types used around the world today if anybody has any experience they wish to share. My question is mainly are most wind turbines of the synchronous or ...
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0answers
51 views

What's the name of the force that opposes the movement of magnet trough a coil?

I am trying to make an experiment that looks like this: I am using this source https://physicshandson.wordpress.com/2019/02/04/damped-oscillations-in-mechanics-and-electromagnetic-induction/ as a ...
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1answer
47 views

How do motors without cooling fins cool down?

I understand that the fan on the motor shaft blows air through the motor fins thus cooling down the motor... However, motors without these cooling fins surely can't cool down the same way. I just don'...
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1answer
61 views

Designing an air transformer based rotary encoder

I want to make a rotary encoder with air coils. Before I make it I want to check with the pros so I don't waste time ordering 3D-printed parts that will never work. I am aware that the output coils ...
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2answers
139 views

Why is the rotor power factor of the induction motor lagging?

A 460-V 60-Hz four-pole Y-connected induction motor is rated at 25 hp. The equivalent circuit parameters are R1 = 0.15 Ω, R2 = 0.154 Ω, XM = 20 Ω, X1 = 0.852 Ω, and X2 = 1.066 Ω. The rotor power ...
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2answers
173 views

Function of ferrite core in the induction cooker coil?

I wondering what is the function of ferrite core in the induction cooker coil? (In the other word why there are no ferrite core in traditional induction heater?)
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5answers
107 views

Detecting if 120v AC wire is live with a 2 or 3 VDC line

For a background, I have 3 DPST bistable (latching flip-flop) relays that I have 120VAC input and 2 outputs. On one side, I have a 120VAC appliance. On the other side I need to find a way to feed it ...
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1answer
57 views

Induction Motor: Reason why the current locus is on the positive imaginary axis

The shown locus is of an induction motor. I was wondering if there is a reason why the imaginary current of a current locus of an induction machine is positive. Every equation contains a term like \$-...
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1answer
321 views

What mosfet do I use in induction heater?

I have been building an induction heater based off this schematic. I have tried using irfp250m mosfets. Works like a charm. But whenever I put a too big piece of iron inside the coil, the mosfets soon ...
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4answers
65 views

Creating higher voltage from DC motor?

Is it possible to take a regular dc motor, use it to spin some strong magnets over some coils, and get a higher voltage than what's being used to drive the motor? I was thinking; if you're able to ...
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3answers
152 views

ON-OFF MOSFET Switch for Induction Heater

The induction heater was tested using a relay as an ON-OFF switch before and worked so i just want to focus on the MOSFET switch part of the schematic. When i tested the circuit using a MOSFET switch ...
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3answers
137 views

A question about Faraday’s law of induction for a closed path

As far as I understand, Faraday’s law states that a varying magnetic field through a closed path creates an E-field along the closed path. And the integral of this field we call electric potential or ...
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2answers
66 views

Powering 5 fans with a LTC 3780 : should I protect it against induction effect?

I want to power 5 fans in parallel (12V 0.80A, each) using a adjustable power supply (DIY, made with an LTC 3780 connected to a 24V 15A PSU and mini Voltmetre). I read that a fan could destroy the ...
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1answer
97 views

Electromagnetic Repulsion Coil Calculations

We have a 3x3 mm circular thin plate, which is made of copper, aluminium similar materials and thickness of the plate is 1 mm i.e. a very light and small piece of metal. To lift this plate about 2 mm ...
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2answers
125 views

Why is wireless charging safe for phone circuits? [closed]

Wireless charging is done by electromagnetic induction, by continuously changing magnetic field in a coil, i.e. by passing AC current through it. I have always been told by others to keep magnets ...
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2answers
97 views

Does this coil topology work at high frequencies?

I have a cast iron wok and an induction hob. My understanding is that a ~24kHz AC in the hob's coil causes heating in the wok due to eddy currents from the varying magnetic field. Sadly, the iron ...
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1answer
97 views

How does Rühmkorff induction coil start and periodically produce sparks?

I found the following pictures and equivalent circuit of the Rühmkorff induction coil: Can someone explain the operating of this coil in a step by step fashion?
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2answers
176 views

How do induction cookers measure temperature?

This is not exactly about electrical circuitry, but I hope it's close enough not to get me kicked out. Please redirect me if necessary. Almost all induction tops advertise possibility to "keep ...
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1answer
315 views

Peak Current vs RMS Current when calculating Reactance

I am having a hard time getting a grip on AC circuit analysis. I have been taking my peak voltage/current and converting it to RMS current and RMS voltage so I can use ohms law and things like that to ...
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0answers
111 views

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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0answers
253 views

Parallel resonant induction heater

I implemented a parallel LC induction heater using theory. I made a simple square wave Inverter providing a frequency of 20kHz to the tuned LC circuit. The problem I'm facing is that my tank is not ...
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1answer
96 views

Sensing Of Load In Induction Heating

In New Induction Appliances When you lift the pan from surface of furnace they automatically switch off the power of furnace so my question is How Induction Cooking Appliances Can Know The ...
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1answer
319 views

Induction heating

I was reading the working principles of induction heating and I think I understand the basics. Out of curiosity, I searched the Internet for a schematic and found one. However, the thing that confuses ...
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50 views

Passive (or very low power sensor) sensor to wirelessly receive wake signal

Context. I am using an ESP32 and a small circuit to control an electronic lock on my one of my exterior doors. It is powered by batteries. It has a door magnet sensor to detect when the door is open ...
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3answers
72 views

Portable electronic musical instrument: energy from pressing keys, no batteries: feasible? [closed]

on one hand electronic musical instruments are very nice (lot of features: change tonality, change timbre, small number of mechanically breakable parts ), on the other hand they need external power ...
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1answer
35 views

How to determine direction of induction current (I inc) according to V emf?

In this question, I easily understand the solution. But I want to determine the direction of induction current (I inc) with the Lenz Law. I know how works Lenz Law, but I couldn't determine the ...
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2answers
148 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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2answers
63 views

Is wireless technology only possible due to inductance?

I asked a friend how capacitative coupling works in glass-mount antennas. He said it's like when installing a sound system; where you want to keep the power & audio cables separated, to avoid ...
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2answers
66 views

Is it possible to induce negative/positive charge wirelessly

Sorry if this question doesnt belong here. I have no clue of what I'm about to ask. I want to know, if possible, how to induce negative/positive charge on objects inside recipients? What I want to ...
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3answers
697 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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1answer
199 views

Can VFD be used with induction motor for regeneration?

I want to use VFD with induction motor to run it as induction generator (driven by external prime mover). Does VFD circuit allow reverse flow of electrical power? Thanks
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1answer
108 views

Induction heater requirements

I am working on determining the specs needed for an induction heater I plan on buying or building. However, I’m having trouble calculating the potential current draw and wattage needed for my ...
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1answer
101 views

How do I keep my LEDs from burning out in a magnetic induction coil?

I built a simple magnetic inductance coil using: For transmitter: 28 awg magnet wire in a "pancake coil" (flat spiral) npn transistor (TIP31C) 2 resistors in parallel battery (tried a 3 volt ...
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2answers
69 views

Limiting the speed of an induction generator

A turbine (whose angular speed must not exceed \$\omega_{max}\$) is driving a 3-phase induction generator. I envisage the generator's electrical output being monitored by a circuit that reacts to ...
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1answer
106 views

Is EMF induced in a conducting loop moving in a uniform magnetic field with uniform velocity perpendicular to the magnetic field?

Due to the the magnetic force= q(v × B), the separation of charges must take place. One point must be at high potential than the other. So can't we just take the separation of the charges as the ...
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0answers
867 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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