Questions tagged [induction]

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2answers
32 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
73 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
92 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
40 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
42 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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1answer
96 views

What is dynamic stability in an induction motor?

What does dynamic stability mean in terms of a 3 phase induction motor when evaluating a slip/torque curve?
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4answers
54 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
84 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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0answers
38 views

What kind of monophasic induction motor is this?

About 15 Years ago I bought an induction motor from a junk yard. It have 6 leads being that 2 are the same lead, so 5. The guy who sold me had no idea from what machine it came. And I don't quite ...
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3answers
120 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
64 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
60 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
115 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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3answers
2k views

Confusion with the nameplate of an induction motor

Regarding the below nameplate of an induction motor: What is meant by?: Δ/Y 220/380 Does that mean if delta connected the line to line voltage must be 220V? Im confused also because isnt 220 ...
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2answers
96 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
88 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
160 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
46 views

Induction Motor Switching Surge

I would like to ask a question related with induction motor Whenever I switch ON & OFF a motor, a small voltage (3-8 V) produced at the metal surface where the motor is attached. I figure out ...
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1answer
153 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
57 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
140 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
58 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
214 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
45 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
32 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
123 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
61 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
65 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
647 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
126 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
89 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
55 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 ...
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1answer
77 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
58 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
63 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
524 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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0answers
192 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 ...
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1answer
166 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, ...
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4answers
85 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
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1answer
85 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
98 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. ...
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1answer
86 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 ...
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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
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
89 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.
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1answer
49 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
142 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 ...
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3answers
103 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 ...
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0answers
63 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 ...