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.

Company & Factory



Company Introduction

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 have ISO 9001:2000 certification in 2006.
* We bought high precision winding machine-JAPAN in 2009 .

Our Advantages

1.Goldeneagle has 25 years experience in inductor coil manufacturing.

2.We are one of the biggest coil suppliers of international famoust brand hearing aid.

3.Goldeneagle is a market leader in precision inductor coil manufacturing (we can make self-bonding air coils from 2mm-300mm, which other suppliers can not achieve).

4.Goldeneagle offers top quality and stable performance coils.

5.With most advanced full automatic winding machine (Nittoku).

6.With 18 kinds of performance inspection & test measures contribute to top-ranking quality:European and American customer satisfaction above 92%.

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