Questions tagged [induction]

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51 views

Electric toothbrush: Role of spring in contact-less charging

I accidentally dropped our electric toothbrush on the floor and the bottom lid came undone. I want to fix the toothbrush and make it watertight again. I would glue the lid back on, but this is impeded ...
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2answers
1k views

Are induction stoves considered inductive loads?

I know a washing machine and a coffee grinder are considered inductive loads so when doing math for wiring you would multiply wattage by 2x to be on the safe side. Just one plate of my inductive stove,...
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1answer
26 views

SPIM Rated Torque

What determines the rated torque of an induction motor? Is it purely limited to max continuous current adherent to heat dissipation requirements, or is there more to it? From what I understand, motors ...
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1answer
56 views

What causes an induction cooker to lower heat level by itself [closed]

It's more than 5 years old. It is difficult to cook in high temperature because the minus sensor appears to be activated all the time. I end up going from 1600 to 400 every time. What must be the ...
3
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1answer
76 views

I need help understanding the dynamics of this oscillator [duplicate]

I'm a beginner at circuits (I'm a high school student interested in electronics), and I'm currently working on a school project about a Magnetostriction Oscillator. The circuit construction is as ...
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0answers
30 views

Battery-less Self-charging Graphics Tablet Pens - EMI

This is a hardware related question. A lot of the new graphics tablets have self-charging, battery-less pens. I assume the charging is inductive, either off the screen surface or from an antenna ...
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0answers
80 views

What're the differences between Eddy Current, Current generated in electric power generator and inductive crosstalk generated between adjacent lines?

I am studying the operation of Q3D, and found the terminology Mutual Resistance used in Q3D. From the Help document, it describes loss due to Eddy Current is modeled in Mutual Resistance. Combined ...
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1answer
46 views

How to determine poles?

I designed an induction generator in the Maxwell program for wind turbine, it worked. I selected 4 poles for stator and rotor and 12 slots for both. Is the number of Poles enough for 1500 rpm speed ...
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0answers
39 views

Wireless charging with metal plate on back of phone: eddy currents wasting energy and heating up?

I just got a car mount for my phone which uses a small magnet stuck to the back of my phone. I'm not sure the material, but I'm guessing it's conductive. My concern is with wirelessly charging my ...
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2answers
83 views

Can induction go through metal with holes?

I admit that I have already made this question in physics SE, but after a month of no answers, I realized engineering might be better suited to everyday applications. I intend to use (Qi) wireless ...
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1answer
49 views

What happens when I overload an induction generator

I am trying to generate power with a small induction generator. The RPM is constant. What will hapen when the rated input torque is exceeded?
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1answer
82 views

Is the current in the correct direction in this image describing a one phase generator?

The dot on the left is current going towards us according to the image. But if the magnet is rotating counter clockwise while the conductor is stationary (which is same as magnet being stationary ...
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3answers
88 views

Please clarify something about electrical transformers

Please have a look at the following picture and tell me what I am not seeing properly. This is a core type transformer. However, I don't quite understand "One-half low voltage winding and one-...
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1answer
73 views

White paste and strong plastic smell on induction stove [closed]

My induction hob, when in use for several minutes on high heat is producing a very heavy plastic smell. The hob is working properly besides this smell. I opened the back of the hob and noticed this ...
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1answer
139 views

Remagnetizing a generator?

https://www.hunker.com/12606720/how-to-remagnetize-an-electric-generator Seems plausible (though I’m still skeptical) for a permanent magnet drill motor. But is it true? And if it is, would it also ...
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1answer
65 views

Could I transfer data over an induction coupled wireless power system

I’m looking to create a battery powered sealed sensor device. Battery recharge would be via inductive coils. Is it possible to use the wireless power transfer as a data transfer link simultaneously?
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1answer
54 views

Powering a small generator with a contactless rotating plate

My goal is to contactlessly power a small generator by rotating a steel plate underneath it. Specifically, I have mounted 6 permanent magnets (rectangular shaped) on a shaft, which is mounted on ball ...
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1answer
63 views

Is a “magneto-dynamic” pickup possible?

I'm trying to imagine a fancy electronic circuit for an electric guitar with lots of customization options. Is it possible to design a guitar pickup analogous to an electro-dynamic speaker? Ie. using ...
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3answers
192 views

Intuitive way of “visualizing” how the energy is stored in an inductor?

I've been trying to more or less understand intuitively how energy is stored in an inductor, but I don't seem to get anywhere decent. In a capacitor I understand, I believe: an external battery pushes ...
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0answers
57 views

Why would an induction cooker periodically click when idle?

A typical induction cooker has output power adjustment which is usually implemented in two fashions. Higher power settings are "continuous" - the cooker outputs say 1200 watts all the time ...
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1answer
87 views

A misunderstanding with Faraday's experiment with iron ring

I am learning about electricity and magnetism, and have got some misunderstanding about Faraday's experiments with iron ring. If iron can conduct electricity, why is electricity inducted only while ...
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0answers
46 views

Induction heating directly from AC wall power

I am working on a project converting a 220 volt resistance heating kiln into an induction heating crucible furnace for melting black sand concentrates from a precious metals mine, which are comprised ...
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1answer
79 views

The coaxial cable is claimed to show the highest common inductance (M) relative to any other cable configuration?

The coaxial cable is claimed to show the highest common inductance (M) relative to any other cable configuration [Henry W. Ott, (1988), Noise Reduction Techniques in Electronic Systems, 2 Ed., AT&...
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1answer
85 views

What happens if we remove the pan from an induction cooker?

When we remove the pan, the circuit will be shorted, right? Why it don't damage the cooker? Even if we use something like an MCB, it should trip something and someone needs to turn it on. Then how is ...
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2answers
49 views

Permanent magnets inside electric motor create stress

I am trying to do a simple project, a brushed DC motor, in my free time to check what I learn in lessons in real life and I've encountered something I didn't think of before while studying the EMF ...
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3answers
168 views

where can I find high gauge copper wires for an homemade induction heater?

I am looking for something similar to this coil but for the life of me I can't find it "separated" from the circuit which I want to make by myself.
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32 views

Determine plate coil properties

I built a copper plate coil, 100 mm by 0.2 mm, 5 turns, 4 cm in diameter. How to determine its approximate inductance value based on its dimensions? Conductor cross-section is 20 mm square, it should ...
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1answer
234 views

Non-contact voltage tester beeping near anything metal in my house?

Ok this is my first post so apologies if this is inappropriate but I need some solid opinions from guys who know about house earthing So me and my dad just moved into an old house and I was walking ...
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41 views

Induction Oven mosfets overheating

I made this circuit inspired by this website: http://www.electroboom.com/ It seemed to work for a few seconds but the mosfets got really hot, they started to smoke and eventually one of them died. I ...
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0answers
44 views

Location determination in electromagnetic digital pen

I was reading an article that explains how SPen from Samsung works. There is one coil in pen. I think there should be one or multiple coils on the sides of the tablet. I guess other graphic tablets ...
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0answers
54 views

Induction heater mosfet arc

I am building an induction heater and connected everything up. Once I connected the circuit the first time I tripped the breaker. The main breaker was only a 20Amp coming from the wall. I realized I ...
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0answers
274 views

Identifying an SMD diode and an SMD Zener diode

I'm trying to repair an DG96-00216C inverter board from a Samsung appliance. My knowledge in electrical engineering is pretty limited. The board is plugged in to 240VAC with a 25A slow fuse. This ...
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1answer
92 views

Using pull down resistor?

I have made an application with 3 Omron IR LED Photo sensors. This sensor can't be bought anymore, but here is the datasheet. I used a transformer 230 AC - 24 AC. Due to induction? the sensor output ...
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4answers
297 views

Why doesn't the shaft of a running induction motor cause an electric shock?

Source: learnenginering.com Source: learnenginering.com Source: Wikipedia.org Source: Own photo. Here are some parts of an asynchronous induction motor aka squirrel cage type rotor. As clearly ...
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0answers
68 views

Voltage in a ring circuit with induced current [duplicate]

Supposed I have 3 resistor, R1=1 Ohm, R2=2 Ohm, R3=3 Ohm. I connect them with copper wire to form a ring R1-R2-R3-R1 I used a device to generate changing magnetic flux in that ring. So there must be ...
6
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1answer
100 views

Sinusoidally squeezing a capacitor

Assuming no load, how does continuously changing the distance between the plates of a capacitor (in a sinusoidal fashion for simplicity) affect the output voltage? Does electromagnetic induction come ...
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2answers
48 views

How to insert copper coil to output terminal? [closed]

I recently purchased a cheap induction heater circuit from ebay. Upon receiving I tried inserting the copper coil to the output terminals but it’s too small. I tried unscrewing the screws on the top ...
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0answers
35 views

Traveling magnetic field

I'd like to do some experiments with a traveling magnetic field. To start with, I'd like to create a traveling magnetic field with a set of coils and try to propel an aluminum sheet. A basic model of ...
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1answer
56 views

Induction and Monitors

I’ve been noticing that my PC monitor turns off for a second when I turn the light switches on. My electrician said that this was completely normal due to “Induction”. I’d argue otherwise, like the ...
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1answer
54 views

Can you have “directional” wireless power transmission (to power an LED)

I've tried to research this, but the only circuit examples I can find use an "oscillating field". I have a project where I would like to put two differently colored LEDs in an object, and ...
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3answers
724 views

How could you (in theory) run an induction cooker from a DC supply?

What would be the most efficient way in thoery to build an induction cooker (hob) to run from DC power at low (ish?*) voltages? I say in theory, so the answers are not limited by products that exist ...
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0answers
30 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 ...
6
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4answers
1k 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 ...
2
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1answer
82 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
114 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 ...
2
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1answer
57 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
71 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
51 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
97 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 (...
1
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1answer
159 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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