What is an electromagnetic drive? What is an electric drive

When the magnetic field moves, the conductor is driven to move together, and this action is called "electromagnetic drive". When the magnet rotates, let the N pole of the magnet be at the radius Oa of the metal disc at a certain time, and according to Lenz's law, an eddy current will be generated on the disc as shown in the figure, and an induced current flowing from A to O will be formed at this radius. This induced current is in a rotating magnetic field and will be subjected to the force of the magnetic field.

This force creates a moment that causes the metal disc to rotate in the direction of rotation of the magnetic field. At this time, the torque generated by the force of the induced current generated from the S pole of the magnet also causes the metal disc to rotate in the direction of the rotation of the magnetic field. As a result, the metal disc rotates in the direction of rotation of the magnetic field.

However, if the rotation speed of the disc is the same as that of the magnetic field, the relative velocity of the two is zero, and the induced current is not generated, and the electromagnetic driving effect disappears. Therefore, under the action of electromagnetic drive, the speed of the metal disc is always smaller than the speed of the magnet or the magnetic field, or the speed of the two is always asynchronous. Induction asynchronous motors are made according to this principle.

Electromagnetic actuation can be used to make meters that measure rotational speed, which are often referred to as magnetic tachometers. We know that in the generator in order to guarantee the alternating current generated at a frequency f 50 seconds-1, it is necessary to control the rotational speed of the rotor. In other cases, in order to get the most out of the machine and use it correctly, it is often necessary to measure its rotational speed and then further control and adjust it.

When measuring speed with a magnetic tachometer, the shaft of the machine under test is connected to the shaft of the permanent magnet in the tachometer through connectors and transmission mechanisms, and the permanent magnet is generally made of a magnet filled with four poles, which forms a rotating magnetic field. On the top of the permanent magnet there is a metal disc called the induction piece. There is a small air gap between the sensor and the permanent magnet, and the two do not touch each other.

When the permanent magnet rotates with the machine's rotating shaft, eddy currents are generated on the sensing chip. This eddy current, in turn, is subjected to the force of the rotating magnetic field, and as a result, the sensor is driven to move in the direction of rotation of the permanent magnet. The rotation of the induction piece will drive the spring connected to the shaft of the induction piece and tighten it, resulting in elastic recovery torque.

Finally, when the sensor is turned at a certain angle, the torque generated by the electromagnetic drive just cancels out the torque recovered by elasticity, and a temporary equilibrium state is reached. The faster the rotation speed of the permanent magnet driven by the machine, the greater the torque generated by the electromagnetic drive of the sensing piece, and thus the greater the deflection angle of the pointer. In this way, the speed of the machine can be displayed by the deflection angle of the pointer.

Electromagnetic drive: the magnet is close to the closed aluminum ring, and the aluminum ring retreats; The magnet is withdrawn, and the aluminum ring follows. Do you know what the reason is?

An electric drive is a drive system with an electric motor as the power source. Including motors, motor controllers, and transmission mechanisms.

The electric drive system is the main core of the electric vehicle and must be well maintained in normal use, because it is related to the use of the electric vehicle and the safety of the driver.

Features of the electric drive system.

1.High energy conversion efficiency.

2.No pollution, zero emission, environmental protection.

3.Flexible and convenient control of the working status.

4.The working state of the system will not be affected by the external environment.

5. No noise, no impact on the environment.

The characteristics of the electric drive, regardless of the driving speed, are very efficient. This is precisely the complementary relationship with the piston internal combustion engine - the electric motor works at low speeds, the electric motor and the piston internal combustion engine work together or independently at medium speeds, and the piston internal combustion engine works independently at high speeds.

In this way, no matter whether the speed of the car is high or low, it is in the best working condition of the sub-power system and achieves the highest work efficiency.

Millions of car purchase subsidies.

When a current flows through a wire, a magnetic field is generated on the outside of the wire, and according to the "right-hand spiral rule", if the thumb points in the direction of the current flow, then the other four fingers point in the direction of the magnetic field. Wrap this wire around a paper tube (non-ferromagnetic material tube), the magnetic field generated by the current-carrying wire will be superimposed, and then according to the right-hand spiral rule, if the four fingers point to the direction of current flow, then the thumb pointing is the direction of the magnetic field line of the magnetic field, and the outflow direction of the magnetic field line is N (magnetic north pole) and the inflow direction is S (magnetic south pole). Experiments have shown that ferromagnetic materials are affected by magnetic fields (think of the attraction of magnets to iron keys).

Now back to the problem, the solenoid valve has a non-metallic skeleton with wires wrapped around it (the metal skeleton will produce eddy currents, causing magnetic loss), there is a ferromagnetic material rod in the skeleton, when there is an electric current (DC) in the wire, a magnetic field will be generated, and this magnetic field will move with the ferromagnetic material rod (as long as there is sufficient current intensity), one end of the material rod is connected with the plunger of the valve, and the action of the magnetic field will change the state of the valve, and the change of this state will be the "opening" and "closing" of the valve 。

RCDB series dry electromagnetic iron remover is an iron removal device used to remove tramp iron in powdery or bulk non-magnetic materials. The dry electromagnetic iron remover can remove kilograms of ferromagnetic materials mixed with non-magnetic materials.