Earphone Speaker NdFeB Magnet
Material: Neodymium / NdFeB
Grade: N30-N54
Type: Sintered
Surface Treatment: Nickle coated or Znic coated or Black Epoxy (customized)
Size: Customized
Shape: Customized
Magnetization Direction: Axial or Diametrical
Package: Carton + Pallet
Delivery time: 7-15 days
Application: 5G Mobile Phone, Audio, Artwork, Electric tools, Automobile, Motor, Refrigerator, MRI, VCM, Printer, Separator etc.
Description: Earphone Speaker NdFeB Magnet, are superior to other type permanent magnets for its high strength and performance. So neodymium magnet widely used in Hospital MRI machines, airplanes, boats, cars, speaker system and earplugs and earphone.
Earphone Speaker NdFeB Magnet
Characteristics Of Sintered NdFeB Magnet Under 23℃+/-2℃
Performance Remanence Induction Intensity (Br) Magnetic Coercive Force (Hcb) Intrinsic Coercivity (Hcj) Maximum Energy Product Squareness Factors Maximum Working Temperature
(BH)max (Hk/Hcj) Tw L/D = 0.7
Grade Min Min Min Range Min
T kGs kA/m kOe kA/m kOe kA/m³ MGOe % °c
N28ZH 1.04 10.4 772 9.7 3184 40 207~239 26~30 90 250
N44AH 1.3 13 971 12.2 2786 35 326~358 41~45 90 230
N42AH 1.29 12.9 963 12.1 2786 35 318~350 40~44 90 230
N40AH 1.26 12.6 939 11.8 2786 35 302~334 38~42 90 230
N35AH 1.17 11.7 868 10.9 2786 35 263~295 33~37 90 230
N30AH 1.08 10.8 804 10.1 2786 35 223~255 28~32 90 230
N42TH 1.29 12.9 957 11.8 2627 33 318 ~ 342 43 ~ 46 90 220
N40TH 1.26 12.6 930 11.5 2627 33 302 ~ 326 40 ~ 43 90 220
N38TH 1.23 12.3 910 11.1 2627 33 287 ~ 310 38 ~ 41 90 220
N35TH 1.18 11.8 876 11 2786 35 263 ~ 287 36 ~ 39 90 220
N33TH 1.13 11.3 844 10.6 2786 35 247 ~ 270 33 ~ 36 90 220
N30TH 1.1 11 796 10 2786 35 223 ~ 247 31 ~ 33 90 220
N28TH 1.05 10.5 756 9.5 2786 35 207 ~ 230 25 ~ 29 90 220
N45EH 1.33 13.3 995 12.5 2308 29 342 ~ 366 45 ~ 49 90 200
N42EH 1.29 12.9 957 11.8 2308 29 318 ~ 342 43 ~ 46 90 200
N40EH 1.26 12.6 930 11.5 2388 30 302 ~ 326 40 ~ 43 90 200
N38EH 1.23 12.3 910 11.1 2388 30 287 ~ 310 38 ~ 41 90 200
N35EH 1.18 11.8 876 11 2388 30 263 ~ 287 36 ~ 39 90 200
N33EH 1.13 11.3 844 10.6 2388 30 247 ~ 270 33 ~ 36 90 200
N30EH 1.1 11 796 10 2388 30 223 ~ 247 31 ~ 33 90 200
N28EH 1.05 10.5 756 9.5 2388 30 207 ~ 230 25 ~ 29 90 200
N52UH 1.42 14.2 1018 12.8 1911 24 390 ~ 422 49 ~ 53 90 180
N50UH 1.39 13.9 1018 12.8 1911 24 374 ~ 406 47 ~ 51 90 180
N48UH 1.37 13.7 1018 12.8 1911 24 358 ~ 390 45 ~ 49 90 180
N45UH 1.33 13.3 995 12.5 1911 24 342 ~ 366 45 ~ 49 90 180
N42UH 1.29 12.9 957 11.8 1990 25 318 ~ 342 43 ~ 46 90 180
N40UH 1.26 12.6 930 11.5 1990 25 302 ~ 326 40 ~ 43 90 180
N38UH 1.23 12.3 910 11.1 1990 25 287 ~ 310 38 ~ 41 90 180
N35UH 1.18 11.8 876 11 1990 25 263 ~ 287 36 ~ 39 90 180
N33UH 1.13 11.3 844 10.6 1990 25 247 ~ 270 33 ~ 36 90 180
N30UH 1.1 11 796 10 1990 25 223 ~ 247 31 ~ 33 90 180
N28UH 1.05 10.5 756 9.5 1990 25 207 ~ 230 28 ~ 31 90 180
N52SH 1.42 14.2 1018 12.8 1512 19 390 ~ 422 49 ~ 53 90 150
N50SH 1.39 13.9 1018 12.8 1512 19 374 ~ 406 47 ~ 51 90 150
N48SH 1.37 13.7 1018 12.8 1512 19 358 ~ 390 45 ~ 49 90 150
N45SH 1.33 13.3 995 12.5 1592 20 342 ~ 366 45 ~ 49 90 150
N42SH 1.29 12.9 957 11.8 1592 20 318 ~ 342 43 ~ 46 90 150
N40SH 1.26 12.6 930 11.5 1592 20 302 ~ 326 40 ~ 43 90 150
N38SH 1.23 12.3 910 11.1 1592 20 287 ~ 310 38 ~ 41 90 150
N35SH 1.18 11.8 876 11 1592 20 263 ~ 287 36 ~ 39 90 150
N33SH 1.13 11.3 844 10.6 1592 20 247 ~ 270 33 ~ 36 90 150
N30SH 1.1 11 796 10 1592 20 223 ~ 247 31 ~ 33 90 150
N28SH 1.05 10.5 756 9.5 1592 20 207 ~ 230 28 ~ 31 95 150
N55H 1.45 14.5 1035 13 1274 16 406 ~ 438 53 ~ 56 95 120
N52H 1.42 14.2 1035 13 1274 16 390 ~ 422 49 ~ 53 95 120
N50H 1.39 13.9 1035 13 1274 16 374 ~ 406 47 ~ 51 95 120
N48H 1.37 13.7 1018 12.8 1274 16 358 ~ 390 45 ~ 49 95 120
N45H 1.33 13.3 995 12.5 1353 17 342 ~ 366 45 ~ 49 95 120
N42H 1.29 12.9 957 12 1353 17 318 ~ 342 43 ~ 46 95 120
N40H 1.26 12.6 930 117 1353 17 302 ~ 326 40 ~ 43 95 120
N38H 1.23 12.3 910 11.4 1353 17 287 ~ 310 38 ~ 41 95 120
N35H 1.18 11.8 876 11 1353 17 263 ~ 287 36 ~ 39 95 120
N33H 1.13 11.3 844 10.6 1353 17 247 ~ 270 33 ~ 36 95 120
N30H 1.1 11 796 10 1353 17 223 ~ 247 31 ~ 33 95 120
N28H 1.05 10.5 756 9.5 1353 17 207 ~ 230 28 ~ 31 95 120
N55M 1.45 14.5 995 12.5 1035 13 406 ~ 438 51 ~ 55 95 100
N52M 1.42 14.2 995 12.5 1035 13 390 ~ 422 49 ~ 53 95 100
N50M 1.39 13.9 1035 13 1114 14 374 ~ 406 47 ~ 51 95 100
N48M 1.37 13.7 1012 12.7 1114 14 358 ~ 390 45 ~ 49 95 100
N45M 1.33 13.3 971 12.2 1114 14 342 ~ 366 43 ~ 46 95 100
N42M 1.29 12.9 938 11.8 1114 14 318 ~ 342 40 ~ 43 95 100
N40M 1.26 12.6 910 11.4 1114 14 302 ~ 326 38 ~ 41 95 100
N38M 1.23 12.3 876 11 1114 14 287 ~ 310 36 ~ 39 95 100
N35M 1.18 11.8 860 10.8 1114 14 263 ~ 287 33 ~ 36 95 100
N33M 1.13 11.3 796 10 1114 14 247 ~ 270 31 ~ 33 95 100
N30M 1.1 11 796 10 1114 14 223 ~ 247 28 ~ 31 95 100
N28M 1.05 10.5 756 9.5 1114 14 207 ~ 230 26 ~ 29 95 100
N55 1.45 14.5 836 10.5 875 11 406 ~ 438 51 ~ 55 95 80
N54 1.45 14.5 836 10.5 876 11 406 ~ 438 51 ~ 55 95 80
N52 1.42 14.2 860 10.8 960 12 390 ~ 422 49 ~ 53 95 80
N50 1.39 13.9 860 10.8 960 12 374 ~ 406 47 ~ 51 95 80
N48 1.37 13.7 860 10.8 960 12 358 ~ 390 45 ~ 49 95 80
N45 1.33 13.3 836 10.5 960 12 342 ~ 366 43 ~ 46 95 80
N42 1.29 12.9 836 10.5 960 12 318 ~ 342 40 ~ 43 95 80
N40 1.26 12.6 836 10.5 960 12 302 ~ 326 38 ~ 41 95 80
N38 1.23 12.3 836 10.5 960 12 287 ~ 310 36 ~ 39 95 80
N35 1.18 11.8 836 10.5 960 12 263 ~ 287 33 ~ 36 95 80
N33 1.13 11.3 796 10 960 12 247 ~ 270 31 ~ 34 95 80
The use of Neodymium-Iron-Boron (NdFeB) magnets in earphone and headphone drivers represents a significant advancement in electroacoustic transducer technology. These magnets serve as the core component of the motor structure, which is responsible for converting electrical audio signals into mechanical motion.
In a standard dynamic earphone driver, the transducer operates on the principle of electromagnetic induction. An electrical signal, represented as an alternating current (I), flows through a voice coil suspended within a static magnetic field (B) generated by the NdFeB magnet. The interaction between the current and the magnetic field produces a Lorentz force (F), which is defined by the equation:F=B⋅I⋅L where L represents the length of the wire in the voice coil. This force causes the voice coil and the attached diaphragm to oscillate, thereby creating the sound waves perceived by the human ear. The adoption of NdFeB magnets, which are rare-earth materials, has allowed for a dramatic reduction in the size and weight of these components compared to traditional ferrite or ceramic magnets.Because NdFeB magnets possess a much higher magnetic energy density—often 5 to 10 times stronger than ferrite magnets of equivalent volume—they enable the design of ultra-compact drivers suitable for in-ear monitors and earbuds without sacrificing sensitivity or sound pressure levels.
Beyond size reduction, the high magnetic flux density provided by NdFeB magnets improves the efficiency of the transducer, allowing for higher output with lower power consumption, which is particularly critical for portable battery-operated devices. Furthermore, the superior magnetic strength allows for a more precise control of the diaphragm’s movement, leading to improved transient response and reduced distortion, which are essential characteristics for high-fidelity audio reproduction. While these magnets are sensitive to thermal fluctuations, modern manufacturing techniques, including specialized coatings like nickel or resilient plastics, are employed to protect the alloy from corrosion and ensure long-term stability in the demanding environment of personal audio equipment.
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