Working Principle Of Electric Energy Meter

When the electric energy meter is connected to the circuit under test, alternating current flows through the current coil and voltage coil, and the two alternating currents generate alternating magnetic flux in their iron core respectively; Alternating magnetic flux passes through the aluminum plate and induces eddy current in the aluminum plate; The eddy current is subjected to force in the magnetic field, So that the aluminum disc can obtain torque (active torque). The greater the power consumed by the load, the greater the current through the current coil, the greater the eddy current induced in the aluminum disk, and the greater the torque for the rotation of the aluminum disk. That is, the torque is directly proportional to the power consumed by the load. The greater the power, the greater the torque, and the faster the rotation of the aluminum disk. When the aluminum disk rotates, it is affected by the braking torque generated by the permanent magnet The braking torque is opposite to the active torque; The braking torque is directly proportional to the speed of the aluminum disc. The faster the aluminum disc rotates, the greater the braking torque. When the active torque and braking torque reach a temporary balance, the aluminum disc will rotate at a uniform speed. The electric energy consumed by the load is directly proportional to the number of revolutions of the aluminum disk. When the aluminum disk rotates, it drives the counter to indicate the consumed electric energy. This is the simple process of electric energy meter.