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Questions tagged [induction]

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0
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1answer
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Faraday law (EMF)

Is is true that the magnetic field generated by a conductor conducting around 20A will not be sufficient in order to provide an EMF of around 3.3V? The frequency of the AC signal is 50Hz. Based on ...
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0answers
32 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 ...
0
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1answer
31 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 ...
2
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1answer
80 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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0answers
36 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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0answers
32 views

Would the 12V relay coil induce significant back and forth current in copper traces of PCB?

will it induce currents in traces just below it or nearby it on PCB, if relay gets switched many times during operation? I am concern about the coils magnetic field change during switchings. Are ...
0
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3answers
71 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 ...
-1
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1answer
28 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
99 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
56 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
59 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 ...
6
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3answers
610 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 ...
0
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1answer
46 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
2
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1answer
66 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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0answers
52 views

A few questions about copper coils, magnets and induction

So I've been into electronics and electricity in general, lately. I've been trying to understand induction. Here's a few questions I had pertaining to it. In what way are coils connected together to ...
0
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1answer
62 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
48 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 ...
1
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1answer
35 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 ...
2
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0answers
220 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 ...
2
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0answers
130 views

In an induction cooktop, what happens to the coils resistance when there is no pot? Does it vary between pots? How does the appliance respond?

An induction cooktop (or an induction rice cooker) uses a copper coil with a high-frequency alternating current going though. The magnetic flux heats any iron-alloy pot placed above. But what ...
0
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1answer
88 views

Induction heater [closed]

Please help me out. I am totally confused. I am searching over the internet many times but failed. My question is: Doe inductor coil (chock) decide resonance frequency of induction heating coil, ...
0
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4answers
67 views

The fields and waves associated with a transformer

Induction in a transformer happens via a fluctuating magnetic field in coil A inducing a voltage and hence current in coil B. An electric field is associated with a fluctuating magnetic field. Is ...
2
votes
1answer
71 views

Interrupter on induction heater

Im currently trying to control the power of my induction heater, i want to use an interrupter to control it. but if i now interrupt the driver at random points, the mosfets wont turn off at zero ...
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2answers
90 views

Can I use rectified AC current to heat an object inside a induction coil?

The reason why I would like to use rectified AC is because I want to keep the magnetic field inside the coil unidirectional. A changing magnetic field induces current in the coil and vice versa. ...
0
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1answer
74 views

Effect on coil of two magnets moving in opposite direction

There is a coil of wire making up a closed circuit and two magnets. What would the effect be on the circuit if we simultaneously moved one magnet towards the coil and the other magnet away from the ...
2
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10answers
2k views

Heating a tube of aluminium electrically

I need to regulate the temperature of the surface of a tube of aluminium. The tube is used as a mandrel for composite molding/curing, so the target temperature is below 100C. Currently, there is no ...
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0answers
70 views

How is the power in induction heaters regulated?

While building an induction heater based on a series lc circuit i started to question myself how im going to control the power going into the lc circuit. Im planning on using a PLL driver to always ...
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0answers
114 views

tank circuit drawing current at no load when in resonance (induction heater)

I'm currently building an induction heater, and mainly interested how it works and why it works, my induction heater is coupled to the work coil which is an LC circuit. Now, if i get near resonance ...
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0answers
33 views

Inducted LED control circuit design

I would like to build a circuit to control 4 LEDs via an inducted current. I would like the inducted current to provide the power for the LEDs, however I would like the LEDs to be lit in a certain ...
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0answers
65 views

Three phase induction motor 3

For most common/casual 3 phase induction motor, If we connect proper capacitors in series or parallel, can we get resonance like LC circuit ? thank a lot. star or delta . doesnt matter.
0
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1answer
46 views

sinewave input input induction motor

If we put for standart 3 phase induction motor sinewave voltage input, will we get sinewave current if we measure motor current with osciloscope. At least sinewave like current ?
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1answer
114 views

Energy in induction furnaces [closed]

I have seen a question in my exam today and I don't know the real answer and need an explanation. Energy conversion in induction furnaces: heat -> electric energy -> magnetic energy electric ...
0
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3answers
64 views

Induction in transformer coil relationship to magnetic field lines in core

From my understanding is the process of induction described by a magnetic field line which approaches a wire perpendicular and creating an local electric field in it which can be detected which ...
0
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0answers
49 views

Bleed Resistor Required in Electrical Induction Circuit?

We use induction circuit to melt metal pieces placed within a coil. The circuit has a 300-950V, 10kHz Power Supply, in series with a Capacitor and the Coil. I can't recall Capacitor/Coil values at ...
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3answers
134 views

Circuit approximation of Induction in guitar pickups

I was trying to learn the way basic guitar circuits work, the other day, and I stumbled upon a thing that I couldn't fully understand. According to this site, a simple guitar circuit can be made as ...
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4answers
2k views

Why is slip necessary in an Induction motor?

Why should the rotor of a 3-phase induction motor not rotate at synchronous speed?
3
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3answers
1k views

DIY Induction Heater failure - MOSFET overheat

I saw this video about DIY Induction Heater and I decided to make it by myself in order to learn something from this project. After finish wiring everything, I connect the power supply and heard/saw ...
0
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0answers
64 views

Toroidal Inductor magnetic field question

I need confirmation of my understanding of the magnetic field induced by a toroid inductor. What think is: The magnetic field B or H encircles the vector lines of A... A being the curl B. A ...
0
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1answer
59 views

Lenz Law - sinusoidal current

I am trying to understand something about Lenz law. First, let me show an example of what I do understand. In this image, I understand a) As the loop moves closer to the current the field increases....
2
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3answers
110 views

Faradays law of induction - where does the energy for the current in second loop come from?

Lets say each of the loops have the same resistance \$R\$ and the emf of the battery is \$V\$. Case1 : There is no second loop. Then if I close the switch for \$t\$ seconds, then the energy supplied ...
0
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1answer
56 views

Can you pair a compass or magnetometer with an induction circuit to create a form of metal detector?

A compass or magnetometer by themselves can only detect/measure magnetic fields, and thus would normally only be able to detect ferrous metals and (possibly) some active electrical circuits in ...
4
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3answers
107 views

Choice of capacitor for high frequency application

I want to recreate this wireless power transfer system that utilizes two resonating LC circuits and induction for power transfer. I want to know the best type of capacitor to use in the LC resonator ...
0
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1answer
101 views

Using an Induction Heater to melt multiple types of metal

Right, here's some context. I have a large amount of metal shavings from a dozen different sources, and they are very light and sharp. Some of them aren't, but most of them are. I need to dispose of ...
0
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2answers
63 views

asynchronous induction motor

DL 1021 Induction motor with three-phase stator winding and squirrel cage buried in the rotor. Technical features: Power: 1.1 kW Voltage: 220 / 380 V Δ/Y Current: 4.3 / 2.5 A Δ/Y Speed: 2870 ...
1
vote
1answer
353 views

Can the primary coil of a Tesla coil be inside the secondary coil?

I'm building a Tesla coil and the secondary coil (about 800 turns of 0.85 mm diameter enameled copper wire) is wrapped around a cardboard tube (about 8 cm diameter and about 1 m long). I was planning ...
1
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3answers
116 views

HF signal in a null experiment. What is the exact mechanism?

Since I've tried to experiment with electronics, I am faced with the problem of HF noise and signals bypassing almost anything I try to stop them. This begun with my attempts to filter the noise of a ...
2
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3answers
638 views

Safe use of Coiled Cable [duplicate]

So we have this machine at work, a strapping machine, and it has a long power lead which is left loose on the ground, and it's getting gradually destroyed - accident waiting to happen. I know that ...
0
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1answer
66 views

Thermostat for induction heater with small coil

I bought a ZVS 1000w induction heater I would like to control it with a thermostat in order to control the temperature of my steel piece. I hold the piece with a clamp and I don't want to put a ...
0
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2answers
133 views

With Flyback Diode, still have spike.

I have the above circuit on a breadboard, where my PWM is coming form a microcontroller with its own current limited power supply. the motor is being powered from another output of my power supply. So ...
0
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2answers
4k views

PI Metal Detector Amplification Circuit

I've been research metal detector designs for a few days now and I can't quite wrap my head around the amplification they are using for the first stage right out of the coil. Below is an example ...