Does the aluminum disc of a single phase AC energy meter rotate?

There is still a bit of a difference between the rotation principle of the electric energy meter and the DC motor.

The electric energy meter generates an alternating magnetic field in the electromagnet through alternating current, and the alternating magnetic field will induce eddy currents in the aluminum disk, which is the force of this eddy current in the magnetic field to make the aluminum disk rotate.

The stator of the DC motor is a permanent magnet, and the magnetic field generated by the coil through the DC current repels the magnet to make the motor rotate.

The motor model you mentioned does have a dead center, and it does not rotate after being energized. But in fact, the applied DC motor has at least 3 sets of coils, so that there will be no dead center, the rotor stops at any position, and it will turn when it is energized.

The aluminum disc of the single-phase AC energy meter will rotate. It is an inductive instrument consisting of a voltage coil and a current coil wound around an iron core.

The watt-hour meter uses the eddy current generated by the voltage and current coil on the aluminum disc to interact with the alternating magnetic flux to generate electromagnetic force, so that the aluminum disc rotates, and at the same time introduces the braking torque, so that the speed of the aluminum disc is proportional to the load power, and the electric energy is measured by the axial gear transmission and the number of revolutions of the turntable is calculated by the meter. Therefore, the main structure of the watt-hour meter is composed of voltage coil, current coil, turntable, rotating shaft, brake magnet, gear, meter, etc. According to the principle of the energy meter, changing the current, voltage, and phase of the input energy meter, as well as changing the speed of the energy meter and the gear ratio, can achieve the purpose of stealing electricity.

The following is divided into two aspects: changing the electrical parameters (current, voltage, phase) and mechanical parameters of the electric meter, speed and gear ratio, and the common methods of electricity theft are analyzed.

1. When the electric energy meter is connected to the circuit under test, there is an alternating current flowing through the current coil and the electric buried voltage coil.

2. These two alternating current bending pins produce alternating magnetic flux in their cores.

3. The alternating magnetic flux passes through the aluminum disk, and the eddy current is induced in the aluminum disk, and the eddy current is affected by the force in the magnetic field, so that the aluminum disk gets torque and rotates.

4. To sum up, this is the reason why the aluminum disc of the electric energy meter rotates.

1. When the electric energy meter is connected to the circuit under test, there is alternating current flowing through the current coil and the voltage coil.

2. These two alternating currents produce alternating magnetic flux in their cores.

3. The alternating flux passes through the aluminum disk, and the eddy current is induced in the aluminum disk, and the eddy current is affected by the force in the magnetic field, so that the aluminum disk gets torque and rotates.

4. To sum up, this is the reason why the aluminum disc of the electric energy meter rotates. With such as.

Atoms and magnetism are very abstract, you just need to understand the general principle, if you are not engaged in research, there is no need to make it clear. We just need to know that there is such a thing as the left-handed law and the right-hand law, and no one can say why this is the case. It's the law of experimentation.

The results of countless experiments are not humanly figured out.

The principle of the electric energy meter is, simply put, that is: when there is no current in the current coil, only the magnetic field lines of the compression coil act on the aluminum disc, and it will not rotate here. When the current coil has an electric current, it also generates a magnetic field acting on the aluminum disc.

The action of the two magnetic fields causes the aluminum disc to rotate.

You said: "This is a model of a DC motor, the rotor and magnetic flux are perpendicular to the flux at first, and when the rotor is connected to direct current, the rotor should not rotate." "Yes, the rotor in the model (that rectangular coil) doesn't rotate when it's in a certain position.

But in practice, there are many rotors and many turns of coils, so that most of the coils have current and magnetic field lines pass through it at any time. Ensure that the motor has enough rotational torque, and the rotor also has a certain degree of inertia, when a group of coils are subjected to the action of magnetic force to produce rotation. When it rotates to a position where there are no magnetic field lines, due to inertia, it will rotate at a certain angle again, so that it is in the position of magnetic field lines again, and the moment is regenerated.

The watt-hour meter uses the eddy current generated by the voltage and current coil on the aluminum disc to interact with the alternating magnetic flux to generate electromagnetic force, so that the aluminum disc rotates, and at the same time introduces the braking torque, so that the speed of the aluminum disc is proportional to the load power, and the electric energy is measured by the axial gear transmission and the number of revolutions of the turntable is calculated by the meter.

1. When the electrical load is in the disconnected position, that is, the electrical equipment does not use electricity at all, there is only voltage in the electric energy meter, and there is no current, and the turntable of the mechanical electric energy meter is still rotating.

2. Latent is a failure of the mechanical electric energy meter in the past, and there is a problem with the meter, which should be replaced and treated.