Factors affecting the quality of air core coil
Air core coil is a coil made of enamelled wire. It has simple structure, high inductance accuracy, small distributed capacitance, high self harmonic frequency, small temperature coefficient, good stability and strong anti-interference ability. It is an inductor that can be used at high frequency.
Air core coil can usually be used as a current transformer, with wide band, small size, light weight, convenient for digital measurement and microcomputer protection. It is widely used in common mode filter, multi frequency transformer, impedance transformer, balanced and unbalanced conversion transformer, EMI noise suppression of electronic equipment, USB line of personal computer and peripheral equipment, LCD panel, low-voltage differential signal, car remote control key, etc.
Air core coil is widely used in daily electronic products, and its effect on electronic circuits is also very significant. Therefore, its quality problems directly or indirectly affect the life or safe use of electronic equipment. Therefore, it is necessary to control the factors that affect the quality of air core coil. What are the factors affecting the air core coil? We can analyze it from the calculation formula of air core coil inductance:
Load its inductance according to the following formula: coil formula
Calculation formula of air core inductance: l (MH) = (0.08d. D.n.n) / (3D + 9W + 10h)
D ------ coil diameter
N ------ coil turns
D ------ wire diameter
H --- coil height
W --- coil width
The units are mm and MH respectively
It can be seen from the above inductance calculation formula of air core coil that the rational factors affecting the quality of air core coil include coil diameter, coil turns, wire diameter, coil height and coil width. Then, after the design appearance, shape and size of the air core coil are determined, the coil turns, wire diameter and inner diameter of the air core coil directly affect the quality of the air core coil. These factors directly affect whether the electrical parameters of the air core coil meet the inductance application conditions.
In addition to these, from the original state, there are the selection of raw materials for wire and the precision of mechanical equipment. The selection of raw materials is determined according to the application conditions and design schemes, and the quality requirements for raw materials have gradually developed from the previous 10 pinholes to 0 pinholes. This is because the industry and customers have higher and higher requirements for the quality of electronic products. The precision of mechanical equipment directly affects the precision of finished products, including: deformation, disordered winding, scratch, poor shape, convex wire, uneven end face, etc., which not only increases the defective rate of products, but also has potential dangers to qualified finished products, often directly affecting the service life of air core coils and the safety of electronic products. Therefore, it is necessary to make high-quality air core coil products, High precision manufacturing equipment must be used.
