Mutual inductance and self inductance definitions and their phenomena, etc

If the current in an energized coil changes, it will cause the magnetic field generated by the coil to also change, and in turn, the changed magnetic field will induce electromotive force in the coil, which is called self-inductance due to the change of current in the coil. Self-induction is a special electromagnetic induction phenomenon. The phenomenon of self-induction follows both Faraday's law of electromagnetic induction and Lenz's law.

Because the rate of change of the magnetic flux in the self-inductive coil is proportional to the rate of change of the current in the coil, the faster the current changes, the greater the self-induced electromotive force, that is, the self-induced electromotive force is proportional to the rate of change of the current.

According to Lenz's law, it can be seen that the self-induced electromotive force always hinders the current change in the circuit where the self-inductance coil is located, that is, if the current in the self-inductance coil increases, the direction of the self-inductive electromotive force is opposite to the current direction. If the current in the self-inductance coil decreases, the direction of the self-inductive electromotive force is the same as the direction of the current.

The mutual inductance phenomenon is a common electromagnetic induction phenomenon, as long as the current change of coil A will cause the change of magnetic flux in coil B and the induced current in B, the magnetic field generated by the induced current will also cause the change of magnetic flux in coil A, so the magnetic flux of the two coils of A and B is affected by each other, and as long as the current in one of the coils in the two coils close to each other changes, the phenomenon of mutual inductance will occur. Oh.

Self-inductance: The electromagnetic induction phenomenon caused by the change of the current of the conductor itself is called the self-inductance phenomenon.

Mutual inductance: When the current in the coil changes, an induced electromotive force is generated in another coil that is nearby, which is called mutual inductance. Mutual inductance is a common electromagnetic induction phenomenon that occurs not only between two coils wound around the same core, but also between any two circuits that are in close proximity to each other.

Self-Sensory Effects:Benefits: Self-inductance is widely used in electrotechnical radio technology.

The self-inductance coil is a basic element in AC circuits or radio equipment, and its combination with capacitors can form a resonant circuit or filter, and the current of the circuit can be stabilized by using the coil's characteristics of resisting current changes.

Disadvantages: The self-inductance phenomenon is sometimes very harmful, for example, when the circuit with a large self-inductance coil is disconnected, due to the rapid change of current, a large self-inductance electromotive force will be generated, resulting in the breakdown of the insulation protection of the coil, or a strong arc in the gap between the electric switch is disconnected, which may burn out the electric switch if there are a large number of flammable dust particles or gases in the surrounding air. These should be avoided.

The above content reference:

The coil's own inherent resistance to changes in magnetic flux is self-induction. The interaction between two coils through magnetic flux is mutual inductance. Let the coil and the resistor (resistance r) be connected in series, and an alternating current is introduced at both ends of this circuit with a frequency of f,, and the voltage U1 at both ends of the inductor and the voltage U2 at both ends of the resistor are measured, and the equivalent resistance r of the inductor is calculated.

According to r=2*pi*f*l, l is self-inductance.

Self-inductance and mutual inductance are defined as follows:

1. Self-feeling. Self-inductance refers to the phenomenon of electromagnetic induction around the conductor when the current passes through the conductor and the current changes in the state, which is called the self-inductance phenomenon.

The generation and magnitude of self-inductance are affected by four factors: magnetic flux turns, self-inductance coefficient, self-inductance magnetic energy, and self-inductance voltage. Self-inductance is widely used in electrician, electrical and radio technology, such as our common contactor coils, solenoid valves, inductive components, electric locks, etc.

2. Mutual inductance. When a coil produces a current change, the adjacent coil also produces a voltage and current change. People call this way of magnetic conversion the phenomenon of wanton mutual inductance.

The generation and magnitude of the mutual inductance will be affected by the self-inductance coefficient and the mutual inductance coefficient (the geometry, size, and relative position of the two coils) of the single coil. Through the phenomenon of mutual inductance, energy can be transferred from the primary coil to the secondary coil. Such as our common transformers, induction coils, voltage regulators, etc.

The difference between self-inductance and mutual inductance

1. Self-inductance is single-coil electromagnetic induction, and mutual inductance is double-coil electromagnetic induction. There are two different ways of energy conversion, but both are based on the principle of electromagnetic induction.

2. Self-inductance is the performance mode of converting electrical energy into magnetic energy, and mutual inductance can realize the conversion of one voltage and current to another.

3. Self-inductance is its own electromagnetic induction, and mutual inductance will change due to the influence of self-inductance.

4. The two induction methods are connected with other electrical components in electronics and electrical appliances, and the functions realized are quite different. Generally, self-inductance is used for frequency modulation, resonance, electromagnetic induction, etc. Mutual inductance is used for circuit transformers, voltage and current regulation, power supply regulation and other purposes.

1. Mutual inductance. When the current changes in one coil, the changing magnetic field it produces will create an induced electromotive force in the other coil, a phenomenon called mutual inductance. The induced electromotive force generated in the phenomenon of mutual inductance is called mutual inductance electromotive force.

2. Self-feeling. A phenomenon of electromagnetic induction due to a change in the current of the conductor itself.

The direction of the self-induced electromotive force follows Lenz's law, and since in the self-inductance phenomenon, the cause of the change in the magnetic flux through the coil is the change of the current in the coil itself, so the direction of the self-induced electromotive force that can be obtained according to Lenz's law always "hinders" the change of the current that causes the self-induced electromotive force.

Mutual inductance. 1. When the current changes in one coil, the phenomenon of induced electromotive force in the other coil is called mutual inductance. The induced electromotive force generated in the phenomenon of mutual inductance is called mutual inductance electromotive force.

2. The mutual inductance phenomenon not only occurs between two coils wound on the same core, but also can occur between any two circuits close to each other.

3. The mutual inductance phenomenon can be used to transfer energy from one coil to another. Therefore, the phenomenon of mutual inductance has a wide range of applications in electrotechnical and electronic technology.

<> self-sensing phenomenon. 1. The electromagnetic induction phenomenon caused by the change of the current of the conductor itself is called the self-inductance phenomenon.

2. The electromotive force generated in the self-inductance phenomenon is called the self-inductive electromotive force of the potato bumper.