Questions tagged [coil]
A coil is an electrical conductor such as a wire in the shape of a coil, spiral or helix. Coils are used in applications where electric currents interact with magnetic fields, in devices such as inductors, electromagnets, transformers, and sensor coils.
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Calculate alternator power from open voltage and short current
A 3-phase BLDC motor, used as an alternator, outputs 3V open-circuit and 5A short-circuit at a given RPM. How can you calculate or at least estimate its useful power at that RPM if we connect it to a ...
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Will this circuit design of a simple slayer exciter circuit work?
I have been looking at different designs for a simple slayer exciter circuit and have attempted to create a circuit diagram for it based on what I have seen from some other designs online. I just ...
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Solenoid coil repairing [closed]
My change over JQX-62F-2Z relay coil burns.
So I want to repair the coil.
Please guide me about wire gauge and turns to repair my relay coil.
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Best method to dampen inductive spiking from pulsing coil with MOSFET?
A simple diode works across the coil to lower the voltage spikes, but I ideally need a way to absorb the inductive spiking as fast as possible. I've heard a Zener diode across the drain and source of ...
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Why does the STM32F030 hang when the solenoid Lock is activated?
The circuit consists of a STM32F030 and several 5 V relays, which are connected to the coil to open the door. The input voltage is from 18 V which is fed from a 220 to 18 V transformer (not switching ...
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Drive up to 64 coils (one at a time)
I want to drive up to 64 (PCB) coils at 5V / 200mA using a PWM signal from a micro controller. I only need to control one coil at a time. So I have two questions:
How can I multiplex the PWM signal?
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How can I calculate how much power an isolation transformer itself consumes if no load is provided?
Isolation transformers usually come with these measures:
Voltamperes
Voltage
Current
In my case, I want to know estimate how much an isolation transformer will consume without a load using these ...
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Turning a microwave transformer into an electromagnet
So I want to turn a microwave transformer into an electromagnet. I've already harvested the transformer, cut through the welds, and removed the coils. I want to know where to position the one coil ...
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Best way to generate a variable clean DC current
On one end I have an amArduino or other microcontroller. On the other end I have a small electromagnet coil with about 20 turns of 1 inch diameter. I need to drive this coil with some precision (say 5-...
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Places to harvest electromagnet coils [closed]
What are some common appliances or electronics that I can harvest a tightly wound coil and core from (like from a transformer for example)? I know about the dangers that come from messing with ...
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Can a coil reversibly modify the field of a permanent magnet?
If I have (say) a rod shaped neodymium magnet and wrap it with a coil, can I use the current in the coil to add to or subtract from the permanent magnet's field in a reversible manner?
Also, would the ...
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Example problem of induced emf in a 100 turn coil by a 100 turn coil which has 90kHz sin wave input voltage
Main Question: Let's say there are two coils each 100 turn and diameter 30 mm, And the second coil is perpendicular to the first coil's magnetic field (placed both coils next to each other; we can see ...
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PCB Coil Inductance Calculation
I am designing (noob electronics engineer) an inductive position sensor using Renesas IPS2200 (https://www.renesas.com/us/en/document/dst/ips2200-datasheet).
The sensor requires a PCB coil (L in the ...
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Example problem of induced emf in a coil rotating in the earth's magnetic field
I just recently learned magnetism-coil-faraday's law and I want to do some real world problem solving.
Question: Let's say a copper wire coil (20 mm dimeter (r=10 mm)) of 3 turns (N=3) is on the ...
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I'd like to make a wireless charging pad
I would like to implement a wireless charging system as my graduation project.
The topology to be used is likely to use the "SS compensation" topology.
The problem is, we have to design the ...
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