The names of motor meters are well known, and these meters consist of a small motor. Different types of motors are used in these energy meters. Some energy meters use mercury motors, commutator motors, and induction motors. Mercury motor energy meters are only used for DC circuits, induction motor energy meters are only used for AC circuits, and commutator motor energy meters are used for AC circuits and DC circuits.

Electricity meters for DC circuits provide readings in ampere hours or watt hours. In this reading mechanism, the motion system continuously rotates. The speed of rotation is proportional to the current. The rotating system is controlled by permanent magnets, which are almost placed in the moving system and generate eddy currents in some parts of the rotating system.

Ampere hour mercury motor energy meter

It consists of a copper disk mounted on the main shaft. The disc rotates between a pair of permanent magnets, and the free space is filled with mercury. One of the magnets is used for braking to rotate the disc.

The working principle of Anshi mercury automobile electric energy meter

The working principle of the ampere-hour mercury motor energy meter is that the measurement current is introduced into the disc through mercury and flows radially to the center of the disc, and then passed to the external circuit through the main shaft and its bearings. Current only flows on the right side of the disc. The magnetic field of the permanent magnet M2 will exert a force on the right side of the disk, which force carries the current. The direction of force can be found by Fleming's left-hand law (F = Bil Newton). The driving torque Td is generated by this force. It cuts off the magnetic field of the left magnet M1 and generates eddy currents in it.

Watt-hour mercury electric energy meter

If the permanent magnet M2 of the ampere hour meter is replaced with a wound electromagnet and connected to a power source, an energy meter energy meter will be generated. The excitation current of the electromagnet is proportional to the voltage. The disc has radial slots.

Commutator motor energy meter

These meters are called watt-hour meters/watt-hour meters. According to its working principle, these instruments are also called Elihu Thomson instruments. These meters are composed of coreless motors, which are composed of wound armatures and commutators.

The working principle of commutator meter

The working principle of the electric motor energy meter is to place two fixed coils (C1 and C2) on the left and right sides of the armature. Each coil consists of a few turns of thick copper wire in series with the power supply. These two coils are connected to the main power supply in the circuit. An electromagnetic field is generated in these two coils. This electromagnetic field is proportional to the current to be measured. The armature rotates by this electromagnetic field. The armature coil generates an electric current therein and supplies the electric current on its commutator. This current is proportional to the power supply voltage. Due to the reaction between the electromagnetic field and the armature coil, a running torque is generated. The braking torque is generated due to the eddy current generated in the disk fixed on the same armature main shaft between two braking magnets (permanent magnets). When the speed of the disk reaches its stable position, the braking torque and working torque will become equal to each other, and the rotation of the disk is proportional to the total energy in the circuit.

Inductive single-phase electric energy meter/single-phase electric energy meter

Inductive meters, single-phase meters are most commonly used as AC meters in home and industrial installations. These energy meters measure electrical energy in kilowatt hours. These induction motor meters are designed for single-phase circuits. In these electric meters, the brake magnet generates an eddy current on the magnetic disk, and the eddy current continuously rotates through a part of the change.

construction

The structure of the electric energy meter is that it is composed of two electromagnets M1 and M2, and a magnet M1 is excited by a line current, which is called a series magnet. The electromagnet generates alternating magnetic flux φ1. This flux is proportional to the line current and phase, and the second magnet M2 is called a parallel magnet. The electromagnet is connected to the power line, its current is proportional to the power supply voltage and generates a lagging magnetic flux φ2, most of the magnetic flux is useless, a small amount of the magnetic flux is useful and flows through the disk D

Working principle of single-phase electricity meter

The working principle of the induction type single-phase electricity meter is that the two magnetic fluxes φ1 and φ2 of the electromagnets M1 and M2 induce electromotive force in the disc, thereby generating eddy current in the disc. These two fluxes and eddy currents react with each other and generate driving torque on the disc. The braking torque is generated by electromagnets M1 and M2. When the driving torque and braking torque become equal, the disc reaches a stable speed,
The total number of uprisings in a given period is proportional to (the power consumed).

Electrolytic energy meter

The electrolytic energy meter is an ampere-hour energy meter and is only used in DC circuits. When these meters are used for other voltage readings, their readings are incorrect. These meters cannot be used on AC circuits. By using small rectifier units in them, these instruments can be used in AC circuits. These meters work according to Faraday's law of electrolysis. These meters are simple, cheap, and accurate under small loads. These energy meters are not affected by stray magnetic fields and friction errors.

Application of electric meter

Energy meters are widely used in the household field to measure the power consumed by users, and these energy meters are generally used in the industrial field to control the power of various machines based on their readings and to measure power.

Zhejiang Tepsung Electric Meter Co., Ltd. is a manufacturer and supplier of single-phase,    three phase meter   , electric energy meters and    Electromechanical KWh Meter   . We have established a mature and professional team in the design, production and sales of electric meters. https://www.yhddb.com/product/electromechanical-kwh-meter/