Home > Products > 9. Antenna RFID Coil > New type RFID Antenna Coil for AM Radios
New type RFID Antenna Coil for AM Radios
- 5000 Piece / Pieces per Month
- FOB ShenZhen or Negotiation
- T/T L/C D/P D/A Credit Card
Product Details
Place of Origin: | Guangdong, China | Brand Name: | GECOIL |
Packaging Details
plastic tray and carton box
Product Description
Specifications
1.Safety and stability2.Quick and easy installation
3.ISO certification
petitive price
5.Eco-friendly
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Work Principle
1.Induction coil working principle: 1. An induction coil consists of two coils of insulated copper wire wound around a common iron core. One coil, called the primary winding, is made from relatively few (tens or hundreds) turns of coarse wire. The other coil, the secondary winding, typically consists of many (thousands) turns of fine wire.
2. An electric current is passed through the primary, creating a magnetic field. Because of the common core, most of the primary's magnetic field couples with the secondary winding. The primary behaves as an inductor, storing energy in the associated magnetic field. When the primary current is suddenly interrupted, the magnetic field rapidly collapses. This causes a high voltage pulse to be developed across the secondary terminals through electromagnetic induction. Because of the large number of turns in the secondary coil, the secondary voltage pulse is typically many thousands of volts. This voltage is often sufficient to cause an electric spark, to jump across an air gap separating the secondary's output terminals. For this reason, induction coils were called spark coils.
3. The size of induction coils was usually specified by the length of spark it could produce; a '4 inch' (10 cm) induction coil was one that could produce a 4 inch arc.
4. To operate the coil continuously, the DC supply current must be broken repeatedly to create the magnetic field changes needed for induction. Induction coils use a magnetically activated vibrating arm called an interrupter or break to rapidly connect and break the current flowing into the primary coil. The interrupter is mounted on the end of the coil next to the iron core. When the power is turned on, the magnetic field of the core created by the current flowing in the primary attracts the interrupter's iron armature attached to the springy arm, opening a pair of contacts in the primary circuit. When the magnetic field then collapses, the arm springs away, closing the contacts again and turning on the current again. This cycle is repeated many times per second.
5. Opposite potentials are induced in the secondary when the interrupter 'breaks' the circuit and 'closes' the circuit. However, the current change in the primary is much more abrupt when the interrupter 'breaks'. When the contacts close, the current builds up slowly in the primary because the supply voltage has a limited ability to force current through the coil's inductance. In contrast, when the interrupter contacts open, the current falls to zero suddenly. So the pulse of voltage induced in the secondary at 'break' is much larger than the pulse induced at 'close', it is the 'break' that generates the coil's high voltage output. A "snubber" capacitor of 0.5 to 15 μF is used across the contacts to quench the arc on the 'break', which causes much faster switching and higher voltages. So the open circuit output waveform of an induction coil is a series of alternating positive and negative pulses, but with one polarity much larger than the other.
6. To prevent the high voltages generated in the coil from breaking down the thin insulation and arcing between the secondary wires, the secondary coil uses special construction so as to avoid having wires carrying large voltage differences lying next to each other. In one widely used technique, the secondary coil is wound in many thin flat pancake-shaped sections (called "pies"), connected in series. The primary coil is first wound on the iron core, and insulated from the secondary with a thick paper or rubber coating. Then each secondary subcoil is connected to the coil next to it, and slid onto the iron core, insulated from adjoining coils with waxed cardboard disks. The voltage developed in each subcoil isn't large enough to jump between the wires in the subcoil. Large voltages are only developed across many subcoils in series, which are too widely separated to arc over. To give the entire coil a final insulating coating, it is immersed in melted paraffin wax or rosin, and the air evacuated to ensure there are no air bubbles left inside, and the paraffin allowed to solidify, so the entire coil is encased in wax.
7. To prevent eddy currents, which cause energy losses, the iron core is made of a bundle of parallel iron wires, individually coated with shellac to insulate them electrically. The eddy currents, which flow in loops in the core perpendicular to the magnetic axis, are blocked by the layers of insulation. The ends of the insulated primary coil often protruded several inches from either end of the secondary coil, to prevent arcs from the secondary to the primary or the core.
Production Process
Purchase Notice
1,Supply of goods
This product is directly produced and sold in Pingxiang factory.Dongguan has one factory while there are three factories in Pingxiang.There is no standard specification for inductance coils.So before purchasing you should contact the customer service to know whether there are samples, to know related costs of samples and fixtures.
2,About size
Inside and outside tolerance:±1% The size of coils is based on drawings. Ferrite deviation:6%-8%.
3,About color
The color of coil is decided according to different raw material of suppliers.In general it is primary color.But if you need other colors, please communicate with our customer service staff in advance.
4,About aftersales
If you find that there is damage of goods after receipt, please tell our customer service immediately and we will give you a satisfactory answer in 24 hours.
5,About delivery
We deliver goods as per customers' address.If you require a special packing, please tell our customer service in advance. We use default express in principle.If you require a different express, please inform us in advance.
- We provide free design proposalf to customers.
- We have the most advanced production equipment and professional technical engineerings withmany years experience.They can give a professional suggestion for cost saving and create a maximum mutual benefit .
- We can meet customers' request by one stop(from windling,injection moulding and assembling.
- We can produce high precison plastic parts from 0.1G-900G)
>>> Our Company
Since its establishment in 2003.
Golden Eagle Coil & Plastic Ltd has continued to develop creative technology to meet constantly changing and diversifying market needs.
Our major products, are precision and miniature self-bonding air coil, bobbin coil, R-Core coil, Antenna Coil, RFID coil, Access Control Products.
Also we provide IPO service.
* We bought high precision winding machine-JAPAN in 2009.
Company Profile
Dongguan Golden Eagle Coil Co., Ltd. ( Golden Eagle Coil & Plastic Ltd) is established in year 2003, at Dongguan city GuangDong Province.
In year 2008 , and established branch factory at Pingxiang City Jiangxi province.
manufactures inductor coils for access control, radio frequency (RF) products , RI Cut (minitor system and videocon coil, and miniature coils with fine wire winding for hearing aid application and utilizing wet winding process technology.
Our miniature coils, miniature plastic injection & over-mold processes are vertically integrated to provide fast, efficient, and cost effective services to our customers.
Over the past several years, our company has expanded facilities and resources to provide customers with total manufacturing solutions and turnkey project support to enable large cost savings to customers through reduced labor costs, reduced floor space requirements and value added assembly.
We have industrial experience, technical expertise, and our dedicated and experienced engineering team can deliver a variety of innovative solutions to our customers.
Our Cost, Services & Quality are proven by our customers and we believe it is the best in the industry.
Our Vision
At Golden Eagle, our vision is to be a leader in miniature voice coil and miniature plastic injection molding. We aim to achieve our vision through round-the-clock customer service, competitive pricing, defect-free quality products, innovation and flexibility.
Our Mission
We want to delight our customers by reducing costs, improving quality, and providing value added and innovative services.
Benefits to Our Customers
-Round the clock (24-7) sales team support
-We communicate in English both written and spoken
-History of delivering in excess of 20% cost saving to our customers
-Exceptional product quality history
-Innovative solutions delivered to all our customers
-Flexible manufacturing process and staff
-Continuous focus on cost reduction and innovation
Services We offer
-All of your inquiries will be replied you within next day
-Cost reduced (labor and material savings)
-Outsourcing final assembly option so customers can free up floor space for new products
-Miniature plastic injection & over-molding
-Miniature precision voice manufacturing
-Value added assembly
Quality
-Our products are manufactured to the highest quality and reliability
-Our company is ISO9001 certified
-On time SPC program, GR & R & FMEA
-It is our management commitment to put our priority on customers' success, needs and satisfaction by innovation and continuous improvement in the quality of our products and services.
We hope our services will be useful to your organization and we look forward to hearing from you soon.
Contact Us
- Dongguan Golden Eagle Coil Co., Ltd.
- Contact nameYana Yu
- Phone86-769-86720318
- AddressTie Lu Keng Industrial Zone, Qi Shi Town Dongguan,Guangdong
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