Magnetic Foundation Permanent magnet magnetic field lines distribution __ Inductance

distribution of magnetic lines of permanent magnets http://www.bjlink.com/article.php?id=75Beijing Ying Ke Hongye Technology Co., Ltd./2011-07-21 [big] [medium] [small]

Date: 2011-1-3 excerpt from: read: 381

1. Magnetic field lines of a single magnet 2. Distribution of magnetic field lines of a single magnet in the vicinity of Ferromagnetic objects 3. Two magnets with different polarity of magnetic field lines distribution 4. Two magnets the distribution of magnetic field lines with the same polarity 5. Two magnets with different polarity and distribution of magnetic field lines 6. Two magnets with same polarity and distribution of magnetic lines in parallel 7. Two magnets with additional iron shells the distribution of magnetic lines in different polarity is 8. Distribution of magnetic field lines of adsorbed magnets attached to iron shells

introduction of magnetic induction intensityBeijing Ying Ke Hongye Technology Co., Ltd./2011-07-21 [big] [medium] [small]

Date: 2009-12-5 excerpt from: read: 355

Magnetic induction Magnetic Induction A basic physical quantity describing the strength and direction of a magnetic field. is a vector, commonly used symbol B. Magnetic induction is also referred to as magnetic flux density or flux density. In physics, magnetic susceptibility (also called magnetic induction intensity) is used to indicate that the magnetic susceptibility is strong, and the magnetic sense intensity is small, and the magnetic susceptibility is weak. This physical quantity is called magnetic induction, but not the intensity of the field, because the term "magnetic field strength" has been used to indicate another physical quantity. A point charge q is affected by force F when Velocity v is moving in a magnetic field. Under the given condition of the magnetic field, the size of F is related to the direction of the charge motion. When V is in a particular direction or in reverse, the force is zero, and when V is perpendicular to this particular direction, the force is the largest, and is FM. FM is proportional to |q| and V, and the ratio is independent of the motion charge, reflecting the nature of the magnetic field itself, defined as the size of magnetic induction. The direction of B is defined as the direction in which the right hand spirals forward when the direction of the maximum Force FM of the positive charge shifts to the direction of the charge motion. After the definition of B, the force of the motion charge in the magnetic field B can be shown as F = QVXB, which is the Lorentz force formula. In addition to the use of Lorentz force definition B, can also be based on the current element Idl in the magnetic field by the Ampere force DF=IDLXB to define B, or according to the magnetic moment m in the magnetic field by the moment m=mxb to define B, three definitions, the same method, completely equivalent. In SI, the unit of magnetic induction is Tesla [1], referred to as Special (T). In the Gauss unit of units, the intensity is Gaussian (Gs), and the 1t=10kgs equals 10 of the four square Gauss. For historical reasons, the basic physical quantities of the magnetic field corresponding to the electric field intensity e are referred to as magnetic induction intensity B, while the other auxiliary quantity is called magnetic field strength H, which is inconsistent with the name and is easily confused. Usually the so-called magnetic field, all refers to B. b in the numerical value is equal to perpendicular to the magnetic field direction length 1 m, the current is 1 a the conductor is subjected to the magnetic field force the size b= F/il The size of some magnetic induction (unit: T) The surface of the nucleus is about 10^12 The surface of neutron star is about 10^8 Current Laboratory value: instantaneous 10^3 constant 37 Interstellar Space 10^ (-10) Human body surface 3*10^ (-10)

What is the magnetic sense line. Beijing Ying Ke Hongye Technology Co., Ltd./2011-07-21 [big] [medium] [small]

Date: 2009-12-5 excerpt from: read: 427

Let's say the small needle is placed in the magnet's magnetic field, the small magnetic needle is affected by the field, and its poles point to the definite direction when stationary. At different points in the magnetic field, the small needle is not necessarily the same direction when stationary. This fact shows that the magnetic field is directional, we agree, in the magnetic field of any point, the small needle n pole of the force direction, for that point of the magnetic field direction. The concept of a magnetic line was first invented and introduced by a famous physicist Faraday. In the electric field, the magnetic line can describe the electric field direction of each point graphically, in the magnetic field can also be used to describe the direction of the electric field, the magnetic line is in the magnetic field is drawn in the actual absence of some of the direction of the curve, these curves on each point of the tangent direction and this is the same direction of the magnetic field. Let me say the magnetic line of different magnetic fields and the method of judgment: Magnetic sense lines of bar magnets and hoof magnets: relatively simple, outside the magnet, the magnetic line comes out from N Pole, into the S pole, and internally from the South Pole to the North Pole. The magnetic inductance line of the linear current magnetic field: In the magnetic inductance line distribution of the linear current magnetic field, the magnetic inductance line is an infinite concentric circle with the electrified line conductor as the center, and the concentric circle surrounds the electrified wire. The experiment shows that if the direction of the current is changed, the direction of the magnetic field of each point becomes the opposite direction, that is to say, the direction of the magnetic induction line changes with the direction of the current. The relationship between the direction of the line current and the direction of the magnetic line can be determined by Amperding (also known as the right hand spiral rule): Hold the conductor with the right hand, so that the direction of the straight thumb is the same as the direction of the current, and the four fingers are the direction of the magnetic line Magnetic inductance line of annular current magnetic field: the current referred to as the annular conductor is called the ring Current, from the magnetic inductance line of the annular current magnetic field, it can be seen that the magnetic inductance line of the annular current is also some closed curve, these closed curves also surround the electrified wire. The magnetic sensing line direction of the annular current also changes with the direction of the current. When studying the magnetic field of the annular current, we mainly care about the magnetic field direction of the points on the ring axis, which can be judged by the right hand rule: the four fingers that bend the right hand are in the same direction as the annular current, and the direction of the straight thumb is the direction of the magnetic line on the Magnetic inductance line of the magnetic field of the solenoid (similar to a bar magnet): The solenoid is wrapped around a circle by a wire. The wire is coated with an insulating layer, so the current does not jump from one lap to another, and can only flow along the wire, which is called an insulated conductor. The energized solenoid can be seen as a number of electrified ring wires together, and we naturally think that the distribution of the magnetic field must be similar. Actually, indeed. To determine the direction of the magnetic inductance line inside the solenoid, you must know the current direction of the solenoid. Solenoid's current direction with its internal magnetic sense line direction, can also use Amperding to determine: the right hand to hold the solenoid, so that the bending of the four refers to the direction of the current direction of the same, straight thumb refers to the direction of the solenoid internal magnetic sense line direction. The magnetic inductance line outside the solenoid and the magnetic inductance line outside the bar magnet are similar and connected with the inner magnetic inductance line to form a closed curve.

The magnetic line, also known as a magnet, is a curve that graphically depicts the distribution of the magnetic field. The magnetic field is defined as the line which is tangent to the magnetic induction intensity, and the magnetic induction is in the same direction as the magnetic flux, and its size is proportional to the density of the magnetic field lines. Understanding the basic characteristics of the magnetic field lines is the basis of mastering and analyzing them.
Both theory and practice show that the magnetic field lines have the following basic characteristics:
1. The curve of the magnetic field is artificial illusion
2. There are countless lines of magnetic line
3. The magnetic lines are three-dimensional
4. All lines of magnetic field are not crossed
5. The relative density of the magnetic field lines indicates the relative strength of the magnetism, that is, the magnetic field is weaker and the magnetic field is strong.
6. The magnetic field lines always go from the N pole to the nearest S pole and form a closed loop.
Similar to current, the magnetic field lines always take the path of the least reluctance (the most permeability), so the magnetic line is usually straight or curved, there is no right angle of the curve of the magnetic flux.
Any two lines of the same direction are mutually exclusive, so there is no intersecting line of magnetic field.
When the ferromagnetic material is not saturated, the magnetic field lines are always perpendicular to the polar surface of the ferromagnetic material. When ferromagnetic materials are saturated, the behavior of the magnetic field lines in the ferromagnetic material is the same as in non ferromagnetic media (e.g. air, aluminum, copper, etc.).
Because of the basic characteristics of the magnetic field lines, the magnetization of the media depends on the magnetic properties and geometrical shapes of the media. It is obvious that, under normal circumstances, the dielectric is in inhomogeneous magnetization state, which means that the magnetic field lines in the medium are all in a curved state and unevenly distributed; In addition, there is no magnetic insulator (except for superconductors), because there is an electrical insulator in the nature, so the magnetic circuit usually has magnetic flux leakage. The accurate calculation of magnetic circuit is very complicated because of the two characteristics of magnetic flux leakage in inhomogeneous magnetization state and magnetic circuit.


Beijing Ying Ke Hongye Technology Co., Ltd./2011-07-21 [big] [medium] [small]

Date: 2008-11-27 excerpt from: read: 675

Magnetic Quantity Name Magnetic quantity Symbol CGS unit SI unit Conversion ratio (SI unit value multiplied by this number is CGS unit value) Magnetic Pole Strength M Wei (Wb) 108/ Magnetic flux Maxwell () Wei (Wb) 108 Magnetic moment Magnetic moment Ann/M 2 (a/m2) 103 Flux density or magnetic induction intensity B Gauss (GS) Wei/m 2 or Special [La] (wb/m2 or T) 104 magnetic field Strength H OST (Oe) Ann/M (a/m) 1/79.6 Magnetic potential magnetic flux potential ｝ Austrian centimeter (OE cm) Ann Turn (A) /10 magnetization intensity M Gauss (GS) Ann/M (a/m) 10-3 Relative magnetization rate Relative permeability 1 Demagnetization factor N (CGS), D (SI) Vacuum permeability 1 Magnetic resistance (AO cm)/Maxwell Anne Turn/Wei (A/WB) 10-9 Anisotropy Constants of magnetic crystals erg/ KJ/M 3 (J/M3) 10 Magnetic Energy Product (B. H Gao Ol (GOe) KJ/M 3 (J/M3) 109/7.96 Energy density of domain wall erg/ KJ/M 2 (j/m2) 103