# 电机引接线电机绕组线电机引出线

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• 有效期至：2021年1月1日
• 所 在 地： 江苏 淮安

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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.

Definition

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:

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.

Self inductance electromotive force

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:

Self inductance electromotive force formula

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)

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.

Self inductance coefficient

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.

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

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)

Demonstration circuit diagram of self inductance phenomenon

In order to deepen our understanding of the phenomenon of self perception, we can observe and analyze from the experiment on the right.

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.

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