An electromagnetic drive "is a physical phenomenon in which when a magnetic field moves relative to a conductor, it creates induced currents in the conductor, which are acted upon by an amperage force," causing the conductor to move. This action is often referred to as electromagnetic drive.

Basic principles of electromagnetic drive

The basic principle of electromagnetic drive is based on Faraday's law of electromagnetic induction "and Lenz's law". When the magnetic field moves relative to the conductor, eddy currents are generated in the conductor. These eddy currents are acted upon by forces in the rotating magnetic field, which in turn produces a torque that causes the conductor to rotate in the direction of the magnetic field. For example, when a magnet "turns, through the coil" the magnetic flux changes, and according to Lenz's law, an induced current is generated in the coil to hinder the flux change, causing the coil to rotate with the magnet.

Application examples of electromagnetic drive

1. Energy meter ": The energy meter commonly used in the family usually adopts the principle of electromagnetic drive. When the current in the circuit passes through the coil of the watt-hour meter, the coil moves in the magnetic field to turn the dial, thus measuring the consumption of electricity.

2. Electromagnetic speedometer: This speedometer is usually used in automobiles to show the speed of the vehicle by measuring the rotational speed of the rotor. The rotor rotates under the action of amperage force in the magnetic field. The higher the rotational speed, the greater the deflection Angle of the pointer.

3. Induction motor ": Induction motor also uses the principle of electromagnetic drive. When the magnetic field rotates, the induced current in the conductor is rotated by the ampere force, which drives the motor.