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联系人:赵礼春  先生 (商务部  经理)
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江苏春晨电缆有限公司生产供应电机引接线电机绕组线电机引出线,线圈里磁通量发生变化的原因不同,就表现有不同形式的电磁感应现象。本文所讲的自感及后下节中的互感都是中药的电磁感应现象。
The changes in the flux in the coil are different, and there are different forms of electromagnetic induction. The mutual inductance in the self inductance and the following section of this article is the electromagnetic induction of Chinese medicine.
定义
Definition

通过前面两节课的学习我们已经知道,如果通过闭合回路所包围面积内的磁通量发生变化,回路中必然产生感应电动势。因此:
By learning from the preceding two sessions, we have known that if the magnetic flux in the area around the closed loop changes, the induced electromotive force is inevitable in the loop. Therefore:
当通过线圈回路中的电流发生变化时,此电流在线圈回路内所产生的磁通也必然发生变化,那么,这一变化的磁通也将在线圈回路中产生感应电动势。这种由线圈回路自身电流变化引起的电磁感应现象称为自感现象,由自感现象所产生的感应电动势称为自感电动势。
When the current in the coil loop changes, the flux produced by the current loop will also change. Then, the flux will also induce the induction electromotive force in the loop circuit. The electromagnetic induction phenomenon caused by the self current change of the coil loop is called self inductance phenomenon. The induced electromotive force induced by self inductance phenomenon is called self induction electromotive force.
自感电动势
Self inductance electromotive force

自感电动势跟其他感应电动势一样,是跟穿过线圈的磁通量的变化率磁通变化率公式(△代表变化量)成正比的。我们知道,在均匀磁场中,磁通量Φ跟电磁感应强度B成正比,B又跟产生这个磁场的电流成正比。Φ跟I成正比,△Φ跟△I也成正比。由此可知自感电动势跟成正比,即:
Electromotive force with other electromotive force, with magnetic flux through the coil of the magnetic flux change rate (change rate formula is proportional to the quantity of the representative). We know that in a uniform magnetic field, the magnetic flux is proportional to the electromagnetic induction intensity B, and B is directly proportional to the current that produces the magnetic field. Is proportional to I, delta phi Delta and are proportional to I. It can be seen that the self electromotive force is proportional to it, that is:
自感电动势公式
Self inductance electromotive force formula
上述公式中各参数含义:
The meaning of each parameter in the above formula:
L:表示自感系数,单位:亨利(H);
L: the self inductance coefficient, unit: Henry (H);
△I:表示线圈中电流变化量(A);
I said: in the coil current variation (A);
△t:表示电流变化△I所经历时间(S);
T said: the current variation of I values through time (S);
eL:表示自感电动势(V)
EL: self inductance electromotive force (V)
上面的自感电动势中的负号表示自感电动势的方向总是与回路中电流方向相反。当线圈电流增大时,自感电动势所产生的自感电流要阻碍电流I增大。因此与I反方向,而当线圈电流减少时,自感电动势所产生的自感电流要阻碍线圈电流I减小,因此与I同向。
Electromotive force above the minus sign indicates the direction of self inductance electromotive force always and loop current in the opposite direction. When the current of the coil increases, the self inductance current produced by the self inductance emf will impede the increase of the current I. Therefore, when the I is in the opposite direction, when the current of the coil is reduced, the self inductance current produced by the self inductance emf will prevent the coil current I to decrease, so that it is in the same direction as the I.
自感系数
Self inductance coefficient

上面的公式中的比例恒量L叫做线圈的自感系数,简称自感或电感。它是表示线圈所固有的一种物理属性。在电路图种常用符号“电路中自感系数符号”表示。自感L的大小是有线圈本身的特性决定的。线圈越长,单位长度上匝数越多,截面积越大,他的自感系数就越大。另外,有铁心的线圈的自感系数,比没有铁心时要大得多,对于一个现成的线圈来说,自感系数是一定的。
The above formula in the proportion of the constant L is called self inductance coil, inductance inductance or short. It is a physical attribute that is inherent in a coil. In the circuit diagram, the common symbol, "the self inductance coefficient symbol in the circuit", is expressed. The size of the self - sensing L is determined by the characteristics of the coil itself. The longer the coil, the more the number of turns on the unit length, the larger the section area, the greater the self inductance. In addition, the self inductance of a coil with an iron core is much larger than that in the absence of an iron core. For a ready made coil, the self inductance coefficient is certain.
通常自感用符号L表示,其单位是亨利,简称亨,国际符号是H。如果通过线圈的电流强度在1秒钟内改变1安培时产生的自感电动势是1 伏,这个线圈的自感就是1亨。所以:
Usually, the self sense is represented by the symbol L, whose unit is Henry, abbreviated as Henry, and the international symbol is H. If the current intensity of the coil is changed by 1 amperes within 1 second, the self induced electromotive force is 1 volts, and the self inductance of this coil is 1 h. So:
1亨=1伏·秒/安
1 =1 Vol. sec / an
常用的较小单位有毫亨(mH)和微亨(μH)他们之间的单位换算关系为:
The commonly used units are mH and micron (mu H), and the unit conversion relation between them is:
1毫亨(mH)=10-3亨(H)
1 milli (mH) =10-3 Henry (H)
1微亨(μH)=10-6亨(H)
1 microsatellite (mu H) =10-6 H (H)
自感现象演示电路图
Demonstration circuit diagram of self inductance phenomenon

为了加深大家对自感现象的理解,我们可以从右图的实验来观察和分析:
In order to deepen our understanding of the phenomenon of self perception, we can observe and analyze from the experiment on the right.
自感现象右图的电路中,A、B两灯泡规格相同,A与电阻R串联,B与带铁心的线圈L串联,R与L的电阻值相等,当和尚开关K后,可以看到电阻R串联的灯泡A立即正常发光,而与有铁心的线圈L串联的灯泡B却是逐渐亮起来,这便是自感现象的表现结果。因为,在接通电路的瞬间,电路中的电流是从零开始增大,穿过线圈L的磁通量也随着增加。供应电机引接线电机绕组线电机引出线
The circuit self inductance phenomenon in A B two, the same lighting specifications, A and resistance R series, B series and L coil with iron core, R and L resistance are equal, when the monk K switch, A resistor R series bulb can see immediately the normal light, and a series of core and coil L the light bulb B is gradually light up, this is the self inductance phenomenon results. For the moment in which the circuit is connected, the current in the circuit begins to increase from zero, and the flux through the coil L increases.
根据电磁感应定律,线圈中必然会产生感应电动势,这个电影电动势阻碍线圈中电流的增大、灯泡B只能逐渐亮起来。供应电机引接线电机绕组线电机引出线
According to the law of electromagnetic induction, the induction electromotive force is inevitable in the coil. The film electromotive force hinders the increase of the current in the coil, and the bulb B can only light up gradually.

  • 品牌
    春晨
  • 型号
    JFEM
  • 规格
    50
  • 材质
    黄铜
  • 适用范围
    500