Why is air gap crucial for magnetic circuit?
Why is air gap crucial for magnetic circuit?
Air-gap is one of the most crucial part of magnetic circuits, especially in high power inductors. It significantly modifies parameters of magnetic devices by increasing of saturation current, linearizes B-H curve of magnetic circuit and causes decreasing of the inductance.
How would an air gap in magnetic path affect the performance of the transformer?
In the case of a transformer or inductor, the air gap only reduces the slope of the B/H loop, reducing permeability and inductance, and hence increasing the magnetizing current in the primary. Thus, in the transformer example, the gap is used to reduce the inductance (perhaps for resonant applications).
What is the value of air gap permeability?
Values for some common materials
| Medium | Relative permeability, max. , μ/μ0 | Permeability, μ (H/m) |
|---|---|---|
| Aluminum | 1.000022 | 1.256665×10−6 |
| Wood | 1.00000043 | 1.25663760×10−6 |
| Air | 1.00000037 | 1.25663753×10−6 |
| Concrete (dry) | 1 |
What is the function of air gap?
When installed and maintained properly, the air gap works as described above, and prevents drain water from the sink from backing up into the dishwasher, possibly contaminating dishes.
Why do we need air gap?
An air gap is a simple way to make certain wastewater and contaminants never re-enter your clean water supply. There is enough distance between the mouth of the faucet and the sink’s rim to ensure that dirty water will never backflow into your kitchen faucet and pollute the clean water supply.
Why does the energy storage in a magnetic material occur mainly in the air gap?
If a high permeability material is used, then very little energy will be stored in the magnetic core. However, the air gap has an advantage of discontinuity and due to its low permeability stores significant amount of magnetic energy, as compared to the same volume of magnetic core before the saturation.
What is air gap in electrical?
The air gap refers to an actual physical gap in an electric motor that separates the moving rotor and the stator core. This gap is a necessary part of motor design and the size of the air gap is one of the keys to motor performance and reliability.
How should the air gaps be present in the magnetic circuit according to length and cross section?
How should the air gaps be present in the magnetic circuit according to length and cross section? Explanation: The air gaps should be present in the magnetic circuit in the low length. The air gap should have maximum cross section to reduce the reluctance.
How does the implementation of air-gap in a magnetic circuit affect parameters?
Implementation of air-gap in a magnetic circuit influences the parameters of magnetic inductor. Additional reluctance of air in the magnetic circuit changes B-H curve, decreasing inductance and increasing saturation current of magnetic inductor.
What is the effect of air gap on inductor?
Inductors, used in power electronic applications, are very often designed with air- gapped magnetic core. Implementation of air-gap influences on the shape of B-H curve of magnetic circuit, decreasing the effective inductance and increasing saturation current of an inductor.
What is the relationship between air gap and flux fringing?
Related pages. The largest is the air gap, the more is the flux fringing and vice versa. A magnetic circuit resembles as a “conductor” so that the magnetic field can put along the desired path. If a high permeability material is used, then very little energy will be stored in the magnetic core.
What happens when the air gap fails in a transformer?
But sometimes in transformer the air gap fails to prevent saturation caused by excessive AC voltage polarization. Air is a non-magnetic part of a magnetic circuit that connects serially and magnetically all the other parts in the circuit to make the flux to flow through the gap.
