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klmnopq
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why in electrical machines we says that magnetic field transfer energy in air gap
but isn't there electric field also in air gap !
but isn't there electric field also in air gap !
If you look at the geometry of a motor, you'll see that the air gap exists between the steel poles of the stator and the steel of the rotor. These steel faces are at ground potential; there is not much potential difference across that gap.klmnopq said:why in electrical machines we says that magnetic field transfer energy in air gap
but isn't there electric field also in air gap !
hxtasy said:no, electric field is generated when a magnetic field moves across an inductor.
for example, two sides of a transformer are separated by a gap, there is magnetic induced, but there is no electrons being transferred.
NascentOxygen said:If you look at the geometry of a motor, you'll see that the air gap exists between the steel poles of the stator and the steel of the rotor. These steel faces are at ground potential; there is not much potential difference across that gap.
gerbi said:(Thread title) We take care about electric field in electric machines. It's alayzed to provide sufficent degree of protection - by the means of electrical insulation. Insulation system is one of the most important ones - it limits machine design a lot.
Why magnetic and not electric field in the air gap ? First of all, it's electromagnetic field (combination of both electric and magnetic).
What is the puroouse of this whole magnetic core in machine design? Why magnetic core is so much connected to the power of machine (generally, bigger machine=bigger core)? Power is transferred between stator and rotor coils by magnetic flux. Air gap is just one of the elements in this 3D magnetic circuit. Magnetic coupling of coils (or magnets etc.) combined with rotation makes this all a working mechanism.
klmnopq said:why and how the surfaces grounded??
klmnopq said:I didn't understand u
I'am asking about why the electric field doesn't play a role in machines not the insulation
why magnetic flux not electric field
gerbi said:Magnetic coupling of coils (or magnets etc.) combined with rotation makes this all a working mechanism.
klmnopq said:so, electric field doesn't contribute in energy transfer or what??
that I'm asking about
The main reason for this is because electric machines, such as motors and generators, rely on the interaction between magnetic fields and electric currents to generate motion or electricity. The magnetic field is responsible for creating a force on the electric current, which then produces the desired effect. In contrast, the electric field only plays a secondary role in the operation of these machines.
The strength and direction of the magnetic field directly impact the efficiency and power output of electric machines. A stronger magnetic field can produce a greater force on the electric current, resulting in more efficient operation. Additionally, the direction of the magnetic field can determine the direction of motion or flow of electricity in the machine.
In certain types of electric machines, such as capacitors and transformers, the electric field is a crucial factor in their design and operation. These devices rely on the electric field to store and transfer energy, and therefore the electric field must be carefully considered and controlled in their construction.
No, the electric and magnetic fields are inherently linked in electric machines. This is due to the fundamental laws of electromagnetism, which state that a changing magnetic field will induce an electric field, and vice versa. Therefore, the two fields cannot be considered separately in the operation of electric machines.
The strength of the magnetic field in electric machines is typically controlled by the amount and direction of the electric current flowing through the machine's coils. By adjusting the current, the strength of the magnetic field can be varied to suit the desired function of the machine. Other factors, such as the number of turns in the coil and the material used for the core, can also affect the strength of the magnetic field.