AS 2214 DC 24V  Electromagnetic brake Clutch holding for Forklift Stacker Small Electric Wheelchair

Unit Dimension:  φ22*14mm / 0.87 * 0.55 Inch

Working Principle :

When the copper coil of the brake is energized, the copper coil generates a magnetic field, the armature is attracted to the yoke by magnetic force, and the armature is disengaged from the brake disc. At this time, the brake disc is normally rotated by the motor shaft; when the coil is de-energized, the magnetic field disappears and the armature disappears. Pushed by the force of the spring toward the brake disc, it generates friction torque and brakes.

Unit Feature:

Voltage: DC24V

Housing: Carbon Steel with Zinc Coating, Rohs compliance and anti-corrosion , Smooth Surface.

Braking Torque：≥0.02N.m

Power : 16W

Current: 0.67A

Resistance: 36Ω

Response time：≤30ms

Working cycle: 1s on, 9s off

Lifespan: 100,000 cycles

Temperature rise:  Stable

Application:

This series of electromechanical electro-magnetic brakes are electromagnetically energized, and when they are powered off, they are spring-pressurized to realize friction braking. They are mainly used for miniature motor, servo motor, stepper motor, electric forklift motor and other small and light motors. Applicable to metallurgy, construction, chemical industry, food, machine tools, packaging, stage, elevators, ships and other machinery, to achieve fast parking, accurate positioning, safe braking and other purposes.

2.This series of brakes consists of a yoke body, excitation coils, springs, brake discs, armature, spline sleeves, and manual release devices. Installed on the rear end of the motor, adjust the mounting screw to make the air gap to the specified value; the splined sleeve is fixed on the shaft; the brake disc can slide axially on the splined sleeve and generate braking torque when braking.

Working Principle of Smart Door Lock

The smart door lock consists of two parts: the solenoid valve and the lock body. The solenoid valve generates a strong electromagnetic force when the current passing through the solenoid coil, pushing the iron core ( plunger ) to move linearly, and pushing the lock tongue to the door frame to achieve the extension and retraction control of the smart lock . When the power is off, the magnetic force on the solenoid valve disappears, and the lock tongue will return to its original working position by the force of spring.  

Due to different designs, electromagnetic door locks are also divided into two types, normally open and normally closed style.

The normally open electromagnetic lock, also known as the power-off unlocking electromagnetic lock, opens when the solenoid valve is powered on. When the solenoid valve is out of power, the lock body is closed.

The normally closed electromagnetic lock, also known as the power-off locking electromagnetic lock, closes when the solenoid valve is powered on. When the solenoid valve is out of power, the lock body is opened.

Both types can be implemented in practical applications and can be set according to actual needs.

• Working voltage: it usually works on DC12V or 24V DC, low power consumption design (current about 200-500mA).
• Action time: extremely fast response speed (<50ms), suitable for instant unlocking needs.

 Design

The three-level conversion of electrical energy → magnetic energy → mechanical energy depends on the coordinated optimization of coil turns, current intensity and core material (such as soft magnetic alloy).

 What is an air core inductor?

Air core inductors represent a fascinating class of electronic components that are unique in their design and functionality. The key to air core inductors (literally) is the avoidance of using magnetic material in the center region of the inductor coil. Instead, it uses free space – air – as the magnetic core. Since air is classified as a non-magnetic material, this puts air core inductors firmly in the category of non-magnetic core inductors.

Unique design and principle

The defining characteristic of an air-core inductor is its construction. Unlike magnetic core inductors, which are able to store and amplify magnetic flux, air-core inductors rely on the inherent inductive properties of the coil itself and the air around it. A magnetic field is generated when current flows through the coil, but without the influence of the magnetic core, that field behaves significantly differently. This fundamental design choice determines its performance attributes and application scenarios.

Performance characteristics

One of the most significant advantages of air-core inductors is their lack of core losses. Hysteresis losses (which occur when a magnetic material is repeatedly magnetized and demagnetized, dissipating energy in the process) and eddy current losses (which occur when current circulates inside the magnetic core) are absent in air-core inductors. No losses means higher efficiency, especially in high-frequency applications.

However, there are some drawbacks to this design. Since the magnetic permeability of air is very low compared to magnetic materials, the inductance value of air core inductors is usually relatively low. In order to compensate and obtain a larger inductance, it is usually necessary to increase the number of turns of the inductor coil. This in turn requires a higher magnetomotive force (MMF) to drive the current through the increased number of turns.

Circuit Symbols

The circuit symbol for air-core inductors, shown in Figure 1, visually demonstrates their uniqueness in electrical schematics. This symbol helps engineers and designers quickly identify air-core inductors and incorporate them into circuit designs, thereby facilitating the creation of innovative and efficient electrical systems.

Unit Size: Diameter 23 * 48 mm 

Application of the copper coils

The magnet Copper coils are wildly used by industries throughout the world for heating (induction) and cooling, Radio-Frequency (RF), and many more purpose. Custom copper coils are commonly utilized within RF or RF-Match applications where copper tubing and copper wire are required to transmit liquids, air, or other media to cool or help induce energy of various types of equipment.

Product Features:

1 Magnet cooper Wire ( 0.7mm 10m Copper Wire) , Coil Winding for Transformer Inductance Coil Inductor.
2 It is made of pure copper inside, with insulating paint and polyester patent leather on the surface.
3 It is easy to use and easy to understand.
4 It has high smoothness and good color.
5It has high temperature resistance, good hardness and is not easy to break.
6Specifications;  .Work Temperature:-25℃~ 185℃  Work Humidity:5%~95%RH

About Our Service;

Dr Solenoid is your trusted source for custom magnet copper coils. We value all our customers and will work with you to create custom copper coils that are designed to your project’s exact specifications.  Our Short-Production Run(s) and test fit prototyping custom copper coils are created with the materials required from your coil design information. Therefore, our custom copper coils are created using various form of copper, such as copper tube, copper rods/bars and copper wires AWG 2-42. When you work with HBR, you can count on receiving exceptional customer support both during the quoting process and after sale service. 

Key function of starter solenoid:

No car works without the initial electrical jolt to crank the engine over. To get it delivered, you need a starter solenoid, a critical electromagnet that starts the chain reaction leading to internal combustion. When your car doesn't start, it may be that you need a replacement starter solenoid. Dr solenoid can help you find the best starter and starter system for your vehicle's make and model in no time at all.

The feature of starter solenoid:

Unit Dimension:  84 mm * 55 mm * 65 mm / 3.3 * 2.16*2.56 Inch 
The starter solenoid relay is made of high-quality copper coil inside, and the surface of the external contact is galvanized, which has strong anti-corrosion and aging resistance with durability, and the solenoid valve gasket has good heat dissipation.

4-terminal design, battery terminal 5/16-24,motor terminal 5/16-24,switch terminal 10-32 post, relay terminal 10-32 post.12 volts. Also with grounded base, ensure the stability and safety of the relay in the working process, improve the anti-interference ability of each electronic component.

Starter solenoids are vital components for automobiles. In short, starter solenoids are electromagnets that actuate or engage the starter motor for your vehicle's internal combustion engine. Starter solenoids are attached directly to starter motors, and they control starter motors throughout vehicle operations.

Modern vehicles of all makes and models use starter solenoids to move the first or starter pinions so they properly engage with engine ring gears. Without  the starter solenoid, your vehicle would not start up properly when you turned the key in your ignition.

Working Principle of a Starter Solenoid:  
 
The role of automotive solenoid relays is very important, because once the solenoid  relay fails, it will cause the car to be immobile. Therefore, some matters need to be paid attention to when using A solenoid relays, such as changes in ambient temperature and heating of the relay itself will cause changes in the coil resistance value, thereby affecting the working stability of the relay.  

Unit Features: 
Unit Dimension: 86 mm * 65 mm * 60 mm/ 3.38 * 2.56 * 2.36 Inch 
4-pole battery isolation solenoid valve: 
Voltage 12V DC; 
Resistance: 14Ω;  
Rating Capacity: 10.2W; 
Maximum transient flash current: 300Amp; but Continuous Working Current recommend under 150 Amp,Bracket: Straight; Bracket mounting: 
Holes 5/16 x 19/32 2-13/64 on center
4 Terminal Max 300A 12 Volt With 2 Copper Point Continuous Duty Solenoid Relay , The electromagnetic relay adopts high-quality components, Coil Roll is using 180℃ copper wire, unit housing is Nickel-Plating, Meet Environmental Plating Requirement.  
Replaces Part Number: This Continuous Duty Solenoid Relay Replacement For 70-111224, 3635820, 1114208, 1114218, 1114223, 1114534, 1114547 

When using A SOLENOID relays:
First, do not use relays with other power source, because automotive relays are driven by batteries, and the power supply voltage will decrease when a large load is connected, affecting the service life of the relay. 
Secondly, it is necessary to pay attention to the insulation level, because the coil will apply the maximum continuous voltage, which not only affects the stability of the relay operation, but also is limited by the insulation performance of the enameled wire. 
Finally, do not exceed the rated relay, because the rated voltage is the guarantee of the reliability of the relay operation. If the coil voltage exceeds the maximum operating voltage, it will cause the coil insulation to drop, short circuit between turns, and burn out.

In short, automotive solenoid relays play a vital key in automotive circuits, and some precautions need to be taken when using a solenoid relay and extend the solenoid relay service life.

The function of a starter solenoid:

A starter solenoid serves the crucial purpose of connecting the battery to the starter the motor in an automotive electrical system. When the ignition key is turned to the start position, an electrical signal is sent to the solenoid. The solenoid then mechanically engages the starter motor's drive gear with the engine's flywheel and electrically closes the contacts to allow a large current to flow from the battery to the starter motor, initiating the engine's cranking process. This ensures a reliable and controlled transfer of electrical power to start the engine.

Unit Features: 
Solve the problem of farm tractor starting, help the farm tractor to return to normal work, replace this starter solenoid relay, can solve the problem of the drive has been rotating or can not start after the engine starts

Unit Dimension: 82 mm * 74 mm* 80 mm/ 3.23 *2.91 *3.15 Inches   
Voltage: 12V, Number of Terminals: 3, Inrush Current :200A
Fitting: This Starter Solenoid Switch Relay fits for Golf Cart. Please check the product details carefully before purchasing.
Package Included : 1x Starter Relay Solenoid, 4 x Nuts, 4 x Washers. Do not to over tighten the nut/terminal during installation.

REPLACE PART NUMBER:  8N11450, SFD6025, 8N-11450, SW218, SW355, 10-FO218-12V, 7-1023-12V, 240-14008. Used for Ford starters on models 2N 8N & 9N farm tractor applications
PREMIUM QUALITY:- Starter solenoid relay is made of high-quality carbon steel housing and pure copper coil inside, which is durable, rust resistant and has 100,000 life cycles. Easy to install and stable performance.
 
Easy to install. Just a few minutes. No cutting, no drilling, no tool requirements. Replacing old or broken solenoid relay can improve the operation of the machine

Understanding Massager Solenoids: The Heart of  Therapy Devices Introduction

Massage devices have become a staple in fitness recovery in 2025, the massager product can offer deep tissue relief and muscle relaxation. The core of these devices is a crucial component, the massager solenoid. Here, we’ll explore what a massager solenoid is, how it works in massage device, and why it’s essential for effective  massager therapy.

What is a massager solenoid?

A massager solenoid is an electromechanical device that converts electrical energy into linear up and down motion. It included a solenoid coil around a movable metal core (plunger). When an electric current goes through the solenoid coil, it generates a magnetic field that moves the plunger up and down, creating a mechanical force.

In massage device, solenoids are responsible for generating the rapid back-and-forth motion that delivers powerful percussive therapy to muscles.

How Does a Massager Solenoid Work?

Electrical Activation – When the massage device is turned on, an electric current flows through the solenoid’s coil.

Magnetic Field Generation – The current creates a magnetic field, pulling the plunger inward.

Impact & Return – The plunger strikes a mechanism (often a spring-loaded mass), creating a percussive force. A return spring or reverse current then pulls it back.

Rapid Repetition – This cycle repeats hundreds or thousands of times per minute (measured in percussions per minute, or PPM), delivering deep muscle treatment.

Unit Dimension: 36 x 28 x 26 mm / 1.04 x 1.42 x 1.59 inch (L*W*H); Voltage: 6 V;    Force: 2 N; Current: 0/6 A; Stroke : 6 mm 

Principle of Flapper Solenoid: 

A flapper solenoid is made with a copper coil, moving plunger and a special design flap, When the electric current passes through copper coil, the plunger retracts. When the current stops passing, the plunger goes back to the previous position with the help of a spring.
With this simple mechanism, the solenoid controls the motion of the flap that connects to the plunger. The flapper solenoid, therefore, gets to control the operation of any mechanical devices attached to it, such as gear sets or a cam mechanism. 

Features:

DC Voltage： DC 6.0 V 
Stroke： 6 mm Force：
keep force > 2 N  
Work Mode：knocking 
Insulation class： Class B，F..... 
Noise：<60dB @ no load 
Power Wattage:  7.2 W
Rate Current:  0.5 A
Resistance: 20 Ω
Lifespan Service : ≥100,000 times 
Working Cycle: 0.5s On, 2s Off

Flapper Solenoid Application: 

The common application of flapper solenoids are used in the copy machines, printing machines, massager chair and other massager product, cotter joint devices, etc.  

What we have and what we can do for you. 

Our international and domestic DC solenoids include open frame solenoids, flapper solenoids
Sucker solenoid, tubular solenoids and special & valve solenoids. If a standard solenoid does not fit your existing project, contact our sales expert for custom solenoid solution options. Solenoids can be designed to meet your specs and are guaranteed maximum function and cost efficiency. Our R & D capabilities include design, development, sample production and first article approval with full documentation. All of our products are 100% tested before shipment, our company are a ISO 9001-2015 certified and RoHS Compliant also. 

Unit Dimension: 58*53*71 MM / 2.3*2.1*2.8 Inch 

How is the solenoid relay work?

A solenoid relay can get a large electric current from the car/machine battery and a small electric current from the ignition switch. When the ignition switch is turned on, a small electric current is sent through the starter solenoid. This causes the solenoid relay to close a pair of heavy contacts, thus relaying a large electric current through the starter motor, which in turn sets the engine in motion.
The starter motor is a series, compound, or permanent magnet type electric motor with a solenoid and solenoid operated switch mounted on it. When low-current power from the starting battery is applied to the starter solenoid, usually through a key-operated switch, the solenoid closes high-current contacts for the starter motor and it starts to run. Once the engine starts, the key-operated switch is opened and the solenoid opens the contacts to the starter motor.

Unit Feature: 

Starter solenoid Relay
Volt: 12v/24v ( adjustable according to your specification)
Current: 200A
Duty Cycle: Intermittent
No. Of Terminals: 4. ( M6,1/4M-28 zinc-plated steel stud terminal )
Note: (2) Threaded Tabs with Screws (1) with Ground Lead for Relay Control@ (2) 12 Gauge Wires with Ring Terminals for B+ & S Terminals, Contact Material: Copper.

Our Plastic-Body Continuous-Duty SPST Series Solenoid Relays are available for a wide range of applications, including starting small engines in lawn tractors, golf carts, sweepers, and more and for use in heavy-duty vehicles, hydraulic systems, and machinery.

Commonly referred to as remote-acting switches, the solenoid switch models available in this starter solenoid series feature single-pole, single-throw (SPST) circuitry with normally open contacts and a glass-reinforced-nylon body that is lightweight, durable, and resistant to corrosion.

The available 100 A continuous-duty starter solenoid models feature silver contact surfaces and can be found in configurations with stud coil terminals or blade coil terminals with insulated 12 V coils or 24 V coils. They come with either an L-style or F-style metal bracket.

The heavy-duty, continuous-duty solenoid relays with a 225 A make/break current rating come with either copper or silver contacts and are available with 12 V, 24 V, or 48 V insulated coils with stud contacts. All available heavy-duty solenoid relay models feature an L-style metal bracket.