Questions tagged [solenoid]

An electromagnet combined with an actuator to convert electrical energy into linear physical motion.

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42 views

Short circuit of solenoid's windings

I wanted to short a solenoid, so I just touched the wire of two adjacent loops at a point somewhere in between of solenoid, but now I wanted to know what changes occur in its inductance and ...
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33 views

AC LC Filter for a Solenoid - Unexpected Behavior

I've been working on a circuit that uses a microcontroller and an H-bridge with 34VDC supply to control a variety of low voltage loads including 24VAC solenoids at 50/60Hz (SHEPWM waveform to knock ...
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What would happen to the magnetic fields of a solenoid if it were wrapped around a hollow ferromagnetic core?

I'm well aware that a solenoid wrapped around a solid ferromagnetic core produces a stronger magnetic field, but what about a hollow ferromagnetic core? Would the fields farther from the center near ...
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1answer
28 views

Suitable amplifier for relay controlling solenoid valve

I have a vacuum gauge with on board relays that trip at set pressures. They have a rating of 30 VDC, 1 A. The solenoid valve I need to control is 50 VDC with max current 3A (also is inductive load of ...
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1answer
37 views

Will This Solenoid Driver Circuit Draw Any Current When Control Input is Disconnected?

I'm working on a battery powered circuit board to drive a small solenoid motor, simple TIP120 as a voltage controlled switch grounding one of the motor terminals. I'm wondering whether or not I need ...
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28 views

Does the solenoid force formula apply to electromagnets?

Related questions: How to calculate the repulsion force between two electromagnets With what force can a solenoid pull? What assumptions does the solenoid force equation make? I am trying to design ...
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43 views

What voltage do I need for my solenoid magnet?

I am looking to buy a suitable solenoid magnet for an experiment. The experiment is quite primitive but I do need the right magnet although my knowledge of electromagnetism or electrical engineering ...
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1answer
92 views

How does a washing machine intake solenoid valve control flow rate? [closed]

Our washing machine, an AEG L69480VFL ( seen here ) has a pair of solenoid valves on its water intake looking like this: (One controls the flow to a tube running to a detergent compartment, the ...
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1answer
45 views

Jumping ring demonstration

In demonstration of jumping ring if we assume dc source connected to solenoid, according to most of books, when we place a metallic ring over the solenoid and as soon as we turned on current, due to ...
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1answer
45 views

Circuit giving values on both AC and DC

I have a generator stopper which works on 220 volt AC (in India 220 volt AC is normal supply) and has an electromagnet which pulls up a lever and the generator is stopped. It works perfectly when the ...
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3answers
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How critical is winding a solenoid/electromagnet neatly?

We've all seen the expensive toroidal winding machines on YouTube, and manufactured solenoids are always so neat in construction - as in: Each winding is neatly packed to its previous, without ...
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62 views

How to use a proximity sensor with a solenoid

Could you please help me with the following issue. It is a basic problem but I need help anyway. Please refer to the picture below. . In fact, I would like to use a proximity sensor in order to ...
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24 views

Solenoid flyback considerations in this pFET/nFET inversion circuit

I am trying to combine FETs, where logic permits, to reduce the size of a pcb. Is it poor practice to have the pFET's gate and nFET's drain shared by an inductive load that will usually be grounded ...
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1answer
29 views

Adding an LED through a FET circuit that currently drives a solenoid

I would like to save space on a layout by consolidating a FET or two, where feasible, on an existing board. One of the FETs used, a coolMOS P7 series (IPA60R280P7SXKSA1), seems to have the drain ...
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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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2answers
37 views

How do I determine how long I can keep my solenoid powered, for safety sake and before ordering it?

I got a solenoid recently, a DSOS-0416-24D from DigiKey, but it gets pretty hot after only 2 seconds of engaging it. How can I know ahead of time what kind of heat a solenoid can withstand, and how ...
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2answers
44 views

How to trigger 50v solenoid with 120v AC

I have an old clock with an analog circuit and the timing sync mechanism gets triggered by a solenoid that likely requires 40-50v. The only power input into the circuit is 120v AC. Ideally I'd like ...
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24 views

Optocupler-Mosfet output for various output

I'm designing a board equipped with a MCU (atmega4809) that need to control different type of industrial graded equipment at 24VDC. These will be mainly a relay or a solenoid coil for pneumatic valve. ...
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1answer
53 views

Running AC solenoid vibration pump with DC voltage

Ulka e series solenoid vibration pump works with Ac voltage directly connected to main power. They are rated at 220, 110, 24 voltage 50-60 Hz. These pumps use an internal diode for removing half cycle ...
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1answer
39 views

Circuit to control 24VAC OR 24VDC solenoids

Is there a circuit out there that could control both 24VDC or 24VAC solenoids from a 24VDC power supply? I am working on a sprinkler control board that I would like to be able to use both on. The ...
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3answers
285 views

Emergency Backup Battery Supply

I am building a NodeMCU controlled 12v solenoid. I am hoping to add an emergency backup battery supply, but the emergency backup supply should not power anything but the solenoid. In other words, if ...
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4answers
982 views

How to build a programmable sticky button

I'm trying to build a button that can exist in two modes. Either it springs back after being pressed, or it stays pressed. I want to switch between these two modes using some complex logic, controlled ...
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2answers
42 views

Micro-controller drives solenoid 12 volt through interposing relay 5 volt issue

Purpose of attached circuit: driving a solenoid (cabinet lock) from microcontroller through relay with a 5 volt coil. Components: ATMEGA8 Relay 5 volt with NO Contact Solenoid 12 volt power supply ...
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1answer
74 views

Need a solenoid to pull a Nerf Gun trigger

I'm looking for a solenoid that be used to pull the trigger of a Nerf gun. Using a strain gauge I determined that you need about 1 kg of force to pull the trigger, and the travel of the trigger is ...
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2answers
86 views

Solenoid Getting Hot and Not Functioning Properly

Please forgive my ignorance on this schematic. I am new to using relays and solenoids so my diagram may be a bit inaccurate. I am attempting to control a DC solenoid with the GPIO pins from a ...
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2answers
391 views

Best MOSFET to control small 12v load with NodeMCU? [closed]

I am pretty familiar with Arduino, and I will be using a NodeMCU for an upcoming project I'm doing. I have never used a NodeMCU before. I am using it along with a few sensors to turn on and off some ...
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1answer
48 views

What assumptions does the solenoid force equation make?

$$F = (N⋅I)^2⋅uA/(2g^2)$$ F = Force I = Current N = Number of turns g = Length of the gap between the solenoid and the magnetizable metal A = Area Does it assume a solenoid of zero length and does ...
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1answer
54 views

Solenoid Simulated Recoil

I have the body of an old Airsoft M4A1 and I had the idea of making it have simulated recoil through a solenoid. I realize that I can't make something with the kick of a real gun but at least ...
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2answers
133 views

Why does the measured back-emf decrease when R is shorted in this circuit?

In the following circuit I move an iron rod back and forth inside a solenoid (represented by Rsol and Lsol) and measure voltage fluctuations across the terminals. I do this under two scenarios: with ...
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2answers
85 views

How can I create a controllable solenoid array?

So to briefly summarize my situation, I am trying to create a programmable solenoid array that will be used to raise and lower pins for a braille display. Considering that each braille character has 6 ...
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1answer
55 views

Attempting to switch on and off a 4.5v solenoid with a transistor. using push button to control input

I have a very simple setup powered by a 9v battery. The lock solenoid when connected directly to the battery works great. I have built a test circuit using a push button and a transistor in an ...
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1answer
107 views

Solenoid and mechanical damping, options for ways to minimize

I have an iron rod supported by a coil spring that vibrates vertically within a solenoid coil. The solenoid has a 5 ohm dc resistance. There is no physical contact between the coil and rod. As I ...
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1answer
69 views

MOSFET for PWM control on a solenoid

I’m currently working on a project where I am utilizing PWM on an Arduino to control a solenoid proportionally. I am designing a device that will play the piano. I would like it to mimic hand ...
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2answers
151 views

What drives the increase in current in LR circuit?

The current in LR circuit increases like this, I could understand the math which produces the graph by making sure the voltage sum is zero. But conceptually, I don't know what actually happens in ...
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1answer
37 views

ESP32 is stopping working

I am currently doing a project on automatic water level control. I have a solenoid valve and ultrasonic sensor. The solenoid valve needs 12 Volt to operate. So I have used a relay to connect it and ...
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1answer
61 views

PWM that can handle rapid on and off cycles?

I am working on a prototype project with a large electromagnetic solenoid. I want to be able to vary the strength of the solenoid via a PWM (preferred), or constant current. The issue I’m having is ...
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1answer
41 views

How to use solenoid valve with vacuum pump

I am a software developer working on small pick and place machine. I have bought mini vacuum pump and one solenoid valve. I want to control vacuum pump suction through solenoid so that when from ...
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1answer
68 views

How can I build a circuit to drive a 12V solenoid from a 3V source, so up 3V to 12V by storing in capacitors, charge and discharge cycles?

No electronics background, noob, but I want to drive a small solenoid to cycle it everytime I push a button. I wanted to use 2 AA batteries in series as they fit the size of my project well. I will ...
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2answers
360 views

Flyback Diode for 24V DC Solenoid

I am trying to select a diode to prevent my circuit from being damaged by the collapsing magnetic field from the solenoid in my circuit. Solenoid power will be switched off through the actuation of ...
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0answers
33 views

How to create optimal solenoid actuator

I would like to create a solenoid like this one: It should be powered by 5V and of course I want it to take as little current as possible. I know it will probably still take a current of around 0.75, ...
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1answer
113 views

Door lock solenoid with finger print & Arduino Nano

Update - 22.01.2020 Here is my schematic. I tried to use all of the comments guys below: Should I use a fly-back diode as commented after I cleared the schematic? If yes, where? Is it required to ...
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1answer
48 views

Circuit design and power management in an Arduino project with stepper motors and solonoids

I am working on a design for a Arduino driven project that controls a 1.7A stepper motor and 2 small solenoid valves. I am using a 12v power supply (Meanwell MDR-60-12) to power the stepper motor (...
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0answers
94 views

Is a rotor of an electrical motor charged with electricity?

This might seem to be dumb question, but as far as I understand it: An electrical motor is made of a rotor and a stator. The stator is electrically powered: it has a solenoid and current passing into ...
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1answer
73 views

How strong are eddy current brakes?

I really just need a rough estimation. How strong are eddy current brakes? For example, if I use a solenoid that has 800 turns with up to 2 amps going through it, and I have the not ferromagnetic ...
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156 views

With what force can a solenoid pull?

I am conducting an experiment, and a hugely important part of the experiment is a solenoid and an iron rod. If the solenoid has current going through it, and I place the iron rod so that it is not ...
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41 views

How does Solenoid works? How do I calculate its output power? [duplicate]

Here is a solenoid valve. It is a normally closed, which is mean, it is normally closed the valve. Vice versa, there is also normally open, which is mean, it is normally open the valve until it ...
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28 views

Capacitor to Retract Solenoid with Low Voltage?

So what I'm basically trying to do is have a push-button motor with a solenoid to open when powered but then close and abruptly stop the gears of the motor from turning. The issue right now is that ...
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2answers
233 views

Magnetic field of 2 solenoids

If I wound 2 solenoids with current in opposite direction (wound into each other like in the 1st photo) will I cancel the magnetic field ? Or did I made it stronger ? Is it better having a twister ...
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2answers
61 views

Magnetic force as a function of PWM frequency

Consider an experiement with a DC source feeding an coil with a constant DC current I. The coil with an iron core attracts a magnetic plate with mass m with force F. The force F is higher than Fm and ...
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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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