Question

The electromagnet is the main component of driving system of energy meter.

Hint:

The driving torque in an induction-type energy meter is proportional to the product of the shunt and series electromagnet fluxes: $$T_d \propto \Phi_{sh} \Phi_{se} \sin \alpha \propto V \cdot I \cdot \cos \phi = \text{Active Power (W)}$$

Answer 1

Step 1: Understanding the Driving System of an Energy Meter:
The driving system of a classic induction-type energy meter is responsible for generating the rotational force that turns the aluminum disc.

Step 2: Identifying Key Structural Parts:
This system consists of two key electromagnets:

• Shunt Electromagnet (Voltage Coil): Wound with many turns of fine wire and connected across the mains supply, producing an alternating magnetic flux proportional to the applied voltage.
• Series Electromagnet (Current Coil): Wound with a few turns of thick wire and connected in series with the load, producing an alternating magnetic flux proportional to the load current.

These electromagnets generate phase-shifted magnetic fluxes that induce eddy currents in the rotating aluminum disc, producing the torque that drives the register system.

Step 3: Conclusion:
Because these electromagnets are the core components of the driving system, the statement is True.