Questions tagged [induction]

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28 views

Transistor circuit swap out motor for crude induction coil

I have a motor, which is the fan from inside a computer, is controlled by a BC237 transistor as in the diagram. The transistor is controlled by a signal from an Arduino. The signal comes on for 5 ...
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3answers
583 views

Can two voltmeters connected to the same terminals show different values? Circuit with induced EMF

The circuit shown below consists of two resistors connected in series that form a closed loop. No electrical sources are in that loop.Let’s assume that the resistance of the wires that connect the ...
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0answers
53 views

Induction coil/furnace specifications for heating small Pt crucible to 1400 °C

We are exploring the idea of using induction to heat up a small platinum crucible (height x diameter x wall thickness is 20mm x 6mm x 1mm) to 1400 °C in vacuum. The Pt crucible will be placed in an ...
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2answers
45 views

When building a Tesla coil, is it possible to use the primary and secondary coils of a second transformer in place of the usual coils?

I am trying to build a Tesla coil. I have a neon sign transformer and a couple of microwave oven transformers. I am trying to understand why using the coils of an additional transformer to act as the ...
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1answer
45 views

Induction cooker power receiver

While building some small (single digit wattage) inductive power transmission systems, I wondered if a larger one could be build using an induction cooker as transmitter. What would be the mandatory ...
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1answer
56 views

Mutual induction

I need to find the mutual induction between two coils. simulate this circuit – Schematic created using CircuitLab The circuit look more or less like the one I have linked. I don't know how to ...
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1answer
45 views

Transformers and switching converters [closed]

I have been reading about the concept of flyback transformers and converters, which has led to various misunderstandings concerning the basic operation of a transformer. Firstly, dc current don't ...
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0answers
16 views

Solenoid Actuator (Linear) Force Calculation

what is the simplest form of law to calculate Solenoid electromagnetic force. i.e. a relation between force and electric current knowing that i'm given a Force constant with measuring unit N/A^2 (...
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1answer
52 views

Unknown induction motor wiring?

I just took apart an old dishwasher for parts. The large motor I got from it seems to be an induction motor. It has 4 wires. Green, yellow, red, and blue. I know for a fact that the green one is ...
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2answers
40 views

Motional Emf confusion

I know that in motional emf V=Blv where B,l,and v are perpendicular to each other. When one of them isn't, then there would be no emf. What formula supports this?(mathematical evidence) Can anyone ...
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2answers
55 views

Does a turbine experience a countering electromagnetic force while it induces a voltage? [closed]

I am assuming yes, because of the law of conservation of energy. A certain amount of energy is required to turn a turbine. So if we want a turbine to spin as well as induce a voltage, then more energy ...
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2answers
56 views

Why are inductive loads an issue for the power grid?

I understand from Power = V_rms * I_rms * cos(phi) Being phi the phase difference between current and voltage. The power consumed by the a circuit is reduced in the case of having inductive or ...
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2answers
73 views

RCA shocking myste [closed]

I got a zap from the shield of a RCA cable from my TV to DVD player(both TV and DVD do not have a ground terminal on the outlet plug). I measured the metal case to ground and I got a reading of 50V. ...
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2answers
109 views

Induction Oven Circuit

I’ve been trying to build an induction cooktop, my inspiration was this post: https://www.instructables.com/id/Powerful-yet-simple-induction-heater/ And after some help , I’ve built a circuit ...
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0answers
59 views

Flat induction cooktop coil reshaping to cylindrical

Ten years ago I acquired a Salton (ID-1081) induction cooktop featured with some flat 55 mm (I.D.) x 170 mm (O.D.) 21 turns coil made of AWG #12 stranded wire. Acceptable IH workloads needed to be at ...
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0answers
136 views

Low or high side switching for ZVS Mazzilli induction circuit?

I'm trying to teach myself electrical engineering as a hobby and have been studying zero voltage switching induction heating circuits. I'm learning about electronics and designing a circuit as I go ...
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1answer
50 views

Mr. Smeow's loud, annoying robot dog [closed]

I bought my cat a robot dog for Xmas. He loves it! I currently have taken it apart to clean some accumulated hair out from around some of the rotating parts. It plays music that is kind of loud and ...
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1answer
30 views

Is the resultant field of a three phase wound stator always two pole?

Suppose I have a stator, where I've allocated one coil for each phase and I supply a balanced three-phase supply. So the fields, $$B_r = B_{max}\cos(\theta_{mech})\cos(\theta_{elec}) \\ B_y = B_{max}...
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3answers
177 views

What happens to parts of induction cooker magnetic field not covered with the pan?

An induction cooker works like this. There's a flat coil of wire under the cooker surface which is connected to a source of high frequency AC and it produces an oscillating magnetic field with field ...
3
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1answer
81 views

How does this RPM sensor work? – Induction in an open circut

I'm looking for explanation of some basic induction concepts. It's common to see an RPM sensor for small two and four stroke engines where an open-ended wire is coiled around the spark plug's ...
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2answers
96 views

If the self-induced EMF in an inductor is 180° out of phase with source voltage, shouldn't they cancel out and net voltage should become zero?

I know that inductor opposes the change in magnetic flux linked with it. In case of an ac sinusoidal voltage applied across a pure inductor, the emf induced across the inductor is equal and opposite ...
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1answer
62 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
66 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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2answers
57 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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2answers
257 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
28 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
143 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
101 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
119 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
89 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
103 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
73 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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45 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
73 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
43 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
54 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
51 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
70 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
303 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
260 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
127 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
60 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
591 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
86 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
223 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
153 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
125 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
131 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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