Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [induction]

The tag has no usage guidance.

6
votes
3answers
585 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
votes
1answer
33 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
votes
1answer
58 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 ...
1
vote
0answers
44 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
votes
1answer
61 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 ...
1
vote
2answers
45 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
vote
1answer
31 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 ...
0
votes
0answers
28 views

Linear induction motor back plate

In a single-sided linear induction motor, there needs to be an iron back plate behind the reaction plate(of Aluminium). Is it necessary to generate force and if it is necessary what is the reason?
2
votes
0answers
140 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 ...
0
votes
1answer
98 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
votes
1answer
69 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
votes
4answers
62 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 ...
0
votes
0answers
69 views

Induction heating coil - copper tubing or litz wire?

I have a 1000 W 48 V Mean Well power supply and a ZVS 12-48V 20A 1000W High Frequency Induction Heating Machine Module. Running the induction heater with a copper heating coil (tube): 5 mm outer dia....
2
votes
1answer
68 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 ...
0
votes
2answers
89 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
votes
1answer
71 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
votes
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 ...
1
vote
0answers
56 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 ...
0
votes
0answers
87 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 ...
0
votes
0answers
32 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 ...
0
votes
0answers
55 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
votes
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 ?
-2
votes
1answer
100 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
votes
3answers
55 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
votes
0answers
44 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 ...
0
votes
3answers
110 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 ...
7
votes
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
votes
3answers
940 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
votes
0answers
54 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
votes
1answer
53 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
votes
3answers
108 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
votes
1answer
55 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
votes
3answers
104 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
votes
1answer
92 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
votes
2answers
59 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
309 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
vote
3answers
110 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
votes
3answers
485 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
votes
1answer
59 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
votes
2answers
124 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
votes
2answers
3k 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 ...
0
votes
2answers
78 views

Multiple induction coils in series (phone charging)

I'm doing a DIY project of sorts, and I'm trying to create an array of about sixteen coils in series in a sort of square. The goal of this is to make a larger charging surface than just a small pad, ...
2
votes
0answers
39 views

Selecting a stable operating point in a core loss vs temperature graph

Not a native english speaker so please bear with me. I want to build an Inductivity of 10uH for a sinewave current (50kHz, 0.5A RMS) and calculate the magnetic resistance . Magnetic Flux should stay ...
1
vote
1answer
285 views

What is polarity of self induced emf?

This is what i've drawn...assume that switch is working rapidly.the first figure shows the direction of magnetic field due to current from battery. Which is proper.but i get confused about second ...
0
votes
1answer
130 views

Could I make the strength of a magnetic field oscillate up and down, by having the voltage increase and decrease while current remains the same? [closed]

I know that because of v=ldi/dt, that if I repeatedly lower and raise the dc current of an inductor at high frequencies, the magnetic field generated will be weaker, so If i instead raised and lowered ...
0
votes
3answers
189 views

Does the formula v=Ldi/dt apply to materials with zero resistence, such as superconductors?

I've been trying to find information about the formula \$ v = L \cdot \frac{di}{dt} \$, it seem to have something to do with voltage drop, and I know voltage drop is caused by resistance, so would a ...
0
votes
1answer
60 views

Why do these types of inverters produce different output power?

In induction heating we generaly use single-switch, half-bridge and full-bridge inverters to generate power. Why is it that they can't all produce the same average power? Single-switch: Half-bridge: ...
9
votes
3answers
4k views

How does a DC clamp meter measure current?

I understand that for AC clamp meters, a changing magnetic field induces a voltage/current in a wire loop and therefore it is possible to measure AC currents by induction. But how does a DC clamp ...
2
votes
1answer
342 views

transformer primary/secondary resistance don't behave by rules for me

I've got an RLC meter which I can set so it's a fixed AC voltage amplitude source. I'm using a planar coil of 25 turns and in theory, when a secondary resistance increases, so should the primary. But ...
0
votes
0answers
98 views

machines 3 phase induction motor

The full load torque of a 3 phase 400 V, 50 Hz,4 pole induction motor is 48 Nm. The motor draws a phase current of 6.61 A. The rotor resistance per phase is referred to stator is 5 ohm. Neglecting ...