The main parameters
The main parameters of the induct土費or are inductance, allowable deviatio和書n, quality factor, distrib街木uted capacitance and ra唱說ted current.
Inductance
The inductance is also called the se空拿lf-inductance coefficient, which is a p少事hysical quantity indicating that the 吃愛inductor generates s開門elf-inductance.
The amount of inductance 化關of the inductor depends mainly on the紙我 number of turns of the coil (nu姐購mber of turns), the winding met廠外hod, the presence or absence of t船員he core and the core material. Ge暗廠nerally, the more coi老的l turns, the denser the wound少水 coil, and the greater the induc醫書tance. A coil with a core has a l光通arger inductance than a coil withou我現t a core; a coil with a larger magnet遠車ic permeability has a larger induc聽但tance.
The basic unit of inductance is Henry 哥照(referred to as Henr媽化y), which is represented by the le區哥tter "H". Commonly used u做在nits are millihenry (mH) and mi窗藍crohenry (μH). The relationship betw數頻een them is:
1H=1000mH
1mH=1000μH
Allowable deviation
The allowable deviation is the allowa那個ble error between the nominal indu著歌ctance and the actual inductance on 厭窗the inductor.
Generally, inductors 報近used in circuits such商術 as oscillation or filtering requir刀日e high precision, and the allowable de得那viation is ±0.2%~±0.5%. T話家he accuracy of coils for 外聽coupling and high-frequency chok體自e is not high; the allowable deviation 行做is ±10. %~15%.
The quality factor, also known 為對as the Q value or the figure of m城冷erit, is the main parameter for 是跳measuring the qualit樂聽y of the inductor.
It refers to the ratio of th暗街e inductive reactance exhib明報ited by the inductor 山現to its equivalent los中光s resistance when operating at亮嗎 an AC voltage of a certain freq會照uency. The higher the Q value of the靜謝 inductor, the smaller the loss and 在場the higher the efficienc你書y.
The quality factor of 吧家the inductor is relat坐光ed to the DC resistance of the coil w看舊ire, the dielectric loss of the 腦校coil bobbin, and the loss caused by th民事e core and the shield.
The distributed capacitance refers t到區o the capacitance be又花tween the turns and turns of th兵個e coil, between the coil and the睡樂 core, between the coil and the ground畫醫, and between the co舊飛il and the metal. The sm西日aller the distributed capacitance of t還海he inductor, the better its stabi村暗lity. The distributed離空 capacitance can make the equivale間能nt energy dissipation resistance larg也書er and the quality f睡也actor becomes larger. Reduce商畫 the distributed capacitan時頻ce commonly used wire wra話船pped wire or stranded enameled朋輛 wire, sometimes also 微音using cellular winding method.
Rated current
The rated current is t見數he maximum current that湖嗎 the inductor can withstand信車 under the allowable working envi銀子ronment. If the operating curre哥暗nt exceeds the rated curre間飛nt, the inductor will change its per會近formance parameters due to 算日heat generation, and eve照綠n burn out due to over著裡current.
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