Electromagnetic terminology

- Nov 03, 2017 -

1. Magnetic domains: the so-called magnetic domain means that each region within the magnetic material contains atoms, the magnetic moment of the atoms are like neatly arranged magnets, adjacent to different regions


2. Magnetization: strong magnetic material after leaving the magnetic field, itself also with a magnetic field, this situation is the magnetization. 7j0` + A & K # c


3. magnetic saturation: ferromagnetic material or ferrimagnetic material in the magnetic polarization or magnetization intensity does not increase with increasing magnetic field intensity significantly


4. Magnetization curve: the curve of material magnetization or magnetic flux density dependent on magnetic field strength.


5. the coercive force: so that magnetization to saturation of the permanent magnet magnetic induction as low as zero required reverse magnetic field strength known as the magnetic coercivity, with the intrinsic magnetic induction UoM or Mr required to reduce to zero Reverse magnetic field strength is called the intrinsic coercivity $ ~ 2H4O! D; g9] 0J


6. Hysteresis: Ferromagnetic or ferrimagnetic material, magnetic induction or magnetization intensity changes with the magnetic field occurred, and the rate of change has nothing to do with the irreversible change. 4O0 @ 4c $ b6B7F $ C (_


7. Hysteresis loop: When the intensity of the magnetic field changes periodically, indicating the closed magnetization curve of ferromagnetic material or ferrimagnetic hysteresis phenomenon.

8. soft magnetic material: When the magnetization occurs in Hc is not greater than 1000A / m, such material is called soft magnet. The typical soft magnetic material, with a minimum of external magnetic field to achieve maximum magnetization. 7y6s7l ^! G% ^: g


9. hard magnetic material: hard magnetic material is not easy to demagnetization after magnetization and can retain long-term magnetic material, also known as permanent magnetic materials


10. the moment of the magnetic material: the hysteresis loop rectangularness with remanence ratio Rr = Br / Bm or square coefficient Rs = B (-Hm / 2) / B (Hm) to represent. 8_ + A4]; _- z

11. the magnetic circuit: mainly composed of magnetic materials, in a given area to form a closed magnetic flux channel media combination. 2j + E'S6n: f-c6j


12. the main flux: the magnetic flux path through the part of the predetermined path.


13, the leakage flux: When the load current flows through the transformer, it will produce magnetic flux around the winding in the winding by the load current flux leakage flux, $ P "c, B8R / G. @


14. iron loss: iron loss including magnetic hysteresis loss and eddy current loss and residual loss, in units of W / kg (W / kg). "j" k! C4Q + X + N) w


15. hysteresis loss: ferromagnetic material in the magnetization process caused by hysteresis energy loss. ; {D0e: f! M "D & h'o


16. eddy current: When the current in the coil changes with time, due to electromagnetic induction, induction coil will be generated in the vicinity of the current.


17. eddy current loss: power loss due to eddy current. $ q "b9c) O! e ']


18. to reduce the eddy current and loss measures: the core with insulating sheets or filaments stacked, and the use of higher resistivity materials such as silicon steel sheet or iron core pressed into the core. On the other hand, the use of eddy current can be made into some induction heating equipment. ) S% A, h6P & a6T1? "R; s8B8i5H


19. DC electromagnet: It includes iron core, armature mechanism, excitation coil, excitation coil wound on the iron core, characterized in that: the excitation coil is connected in series with the positive temperature coefficient thermistor and the direct current power supply (DCV). & xR-H1?, H $ M, \ 8ox3H


20. AC electromagnet: AC electromagnet used to generate AC magnetic field. The AC electromagnet increases the excitation capacity of the hollow AC coil, making the high frequency and high magnetic field an effective experimental platform. 6O; g6B5A # G.r% L


21. Resonance :: When the frequency of excitation in the circuit is equal to the natural frequency of the circuit, the amplitude of the electromagnetic oscillation of the circuit will also peak. In fact, resonance and resonance express the same phenomenon.


22. Series Resonance (Voltage Resonance) Conditions: In an AC circuit with resistive, inductive, and capacitive components, the voltage across the circuit is generally different from the phase of the current in the circuit. $ n9a0E3w'h $ N; _ # d


23. the series circuit: current through each component circuit in turn.The basic characteristics of the series circuit is only one branch


Article from NdFeB Industry Network

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