Function Of Ignition Coil
ignition coil plays a crucial role in the car, let's take a look at what the characteristics and structure of the ignition coil. Ignition coil is the role of the power of 12V low voltage into 15 ~ 20kV high voltage. Ignition coil with or without additional resistance can be divided into additional resistance type and without additional resistance type. By core shape can be divided into open magnetic circuit and closed magnetic circuit. According to functional differences, divided into ordinary type and high-energy type. 1. Open magnetic circuit ignition coil Traditional open magnetic circuit ignition coil, mainly by the core, winding, bakelite cover, porcelain cup and other components. (1) The iron core is made of laminated silicon steel insulated from each other. The plates are separated by oxide oil layer or coated insulation family. The outer sleeve is sleeved with insulating sleeve to enhance the magnetic flux. (2) the primary winding with wire diameter of 0.5 ~ 1.0mm enameled wire wound around the outer layer of the primary winding, to facilitate cooling, the primary winding of 230 to 370 turns. There are several layers of insulation paper on the outside to enhance the insulation. Winding around the vacuum immersed in a mixture of paraffin and rosin to further enhance the insulation. The role of the primary winding is the use of current changes in the winding to achieve electromagnetic induction. (3) the secondary winding with wire diameter of 0.06 ~ 0.10mm enameled wire wound around the core insulation sleeve, about 11000 ~ 26000 turns. To enhance insulation and avoid mechanical damage, each layer of wire is separated by insulating paper, the outermost layer of insulating paper is more, or put a cardboard sleeve. Its role is to produce mutual induced electromotive force. (4) Between the primary winding of the steel sleeve and the shell there is a steel sleeve for the permeability. Magnetic steel roll into a cylinder, forming part of the magnetic circuit, the core to form a semi-closed magnetic circuit to reduce magnetic flux leakage. (5) Filler In order to strengthen the insulation and prevent the infiltration of moisture, fill the casing with bitumen or transformer oil. When filling the transformer oil, the coil has better heat dissipation, lower temperature rise and good insulation. In recent years, gas-insulated SF6 or other plastic molded insulation has also been used. (6) Additional resistance The three-wire ignition cylinder shell is equipped with an additional resistor on the outside. The two ends of the additional resistor are connected to the "+" and "switch" posts on the bakelite cover to improve the ignition performance. There are no additional resistors for the two ignition coils, and an additional resistor is connected between the ignition switch and ignition coil "+". The role of additional resistors is to improve the ignition performance.2. Closed magnetic circuit ignition coil Traditional open magnetic circuit ignition coil, the secondary winding in the core of the flux through the magnetic steel sleeve loop, the magnetic line of the upper and lower part of the air through the magnetic resistance Large, leakage of magnetic flux and more, so the magnetic loss, conversion efficiency is low (about 60%). Closed magnetic circuit Ignition coil iron core is "Yue" shape or "mouth" shape, the core around the primary winding, the secondary winding outside the primary winding, the core constitutes a closed magnetic circuit, the magnetic circuit is only provided A tiny air gap. Closed magnetic ignition coil less magnetic leakage, magnetic reluctance, energy loss, energy conversion efficiency (about 75%). In addition, the closed magnetic circuit ignition coil structure is simple, small size, light weight, the increasingly widespread application.
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