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Working principle of transformer
Category： Industry dynamics
2023-12-11
The working principle of the transformer is to use the principle of electromagnetic induction. When the primary coil of the transformer is connected to the AC power supply, the iron core generates an alternating magnetic field, and the secondary coil generates an induced electromotive force. The primary and secondary windings of the transformer are independent and are not wound around each other. When no load, the current in the primary coil is zero, the magnetic field is all concentrated in the iron core, and the relative permeability of the iron core is close to vacuum, close to 1. According to the principle of electromagnetic induction, electric potential cannot be generated when there is no current in the secondary coil, and there is no magnetic field without electric potential. When the secondary coil is loaded, the secondary coil and the iron core form a closed loop, and there will be magnetic flux in the iron core. Through, the current of the primary coil is proportional to the magnetic flux, that is, the current in the primary coil will change with the change of the magnetic flux. When the magnetic flux increases, the current will increase, and when the magnetic flux decreases, the current will decrease. Due to the change of the current, an induced electromotive force is generated in the secondary coil. From the fact that the magnitude of the induced electromotive force is proportional to the rate of change of the magnetic flux, it can be seen that the faster the change of the magnetic flux, the larger the induced electromotive force. Therefore, when the input AC frequency increases, the magnetic flux change rate in the core of the transformer increases, the induced electromotive force in the secondary coil is higher, and the current is stronger. In this way, the transformer can change the alternating current into the same frequency of the alternating current output.
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RELATED INFORMATION
What is the role and working principle of the transformer?
Usually used in machine tools, machinery and equipment as electrical control lighting and indicator power.
View Details2023/09/06
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