When the electric energy meter is connected to the circuit under test, alternating current flows through the current coil and the voltage coil, and these two alternating currents respectively generate alternating magnetic flux in their iron cores; the alternating magnetic flux penetrates Passing the aluminum plate, the eddy current is induced in the aluminum plate; the eddy current is subjected to force in the magnetic field, so that the aluminum plate obtains the torque (primary torque) and rotates. The greater the power consumed by the load, the greater the current passing through the current coil, the greater the eddy current induced in the aluminum disk, and the greater the torque that makes the aluminum disk rotate. That is, the magnitude of torque is proportional to the power consumed by the load. The greater the power, the greater the torque, and the faster the aluminum plate will rotate. When the aluminum disc rotates, it is acted by the braking torque generated by the permanent magnet. The braking torque is opposite to the main torque; the braking torque is proportional to the rotation speed of the aluminum disc. The faster the aluminum disc rotates, the braking torque is also Bigger. When the main torque and braking torque reach a temporary balance, the aluminum disc will rotate at a constant speed. The electrical energy consumed by the load is proportional to the number of revolutions of the aluminum plate. When the aluminum plate rotates, it drives the counter to indicate the power consumption. This is the simple process of the electric energy meter.
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