Yuav ua li cas tiv thaiv Demagnetization ntawm U Shaped Magnets nyob rau hauv high-kub ib puag ncig

U-shaped neodymium hlau nplaumxa cov khoom sib nqus tsis sib xws - kom txog thaum tshav kub kub. Hauv kev siv xws li motors, sensors, lossis industrial machinery ua haujlwm siab tshaj 80 ° C, irreversible demagnetization tuaj yeem ua rau tsis zoo. Thaum U-magnet poob tsuas yog 10% ntawm nws cov flux, qhov chaw ua haujlwm nyob rau hauv nws qhov sib txawv, ua rau lub cev tsis ua haujlwm. Nov yog yuav ua li cas tiv thaiv koj cov qauv:

Vim Li Cas Kub Kills U Magnets Faster

Neodymium hlau nplaum demagnetize thaum thermal zog cuam tshuam lawv cov atomic alignment. U-shapes ntsib cov kev pheej hmoo tshwj xeeb:

• Geometric Stress: Khoov tsim cov ntsiab lus nro sab hauv uas yooj yim rau thermal expansion.
• Flux Concentration: High field density in the gap accelerates zog poob ntawm siab temps.
• Asymmetric Failure: Ib ceg demagnetizing ua ntej lwm qhov tsis sib npaug ntawm cov hlau nplaum.

5-Point Defense Strategy

1. Kev xaiv cov khoom siv: Pib nrog qib zoo

Tsis yog tag nrho NdFeB sib npaug. Ua ntej cov qib high-coercivity (H series):

2. Thermal Shielding: Txhaum Txoj Kev Kub Kub

Case Study: Lub tshuab hluav taws xob servo txo ​​qis U-magnet tsis ua haujlwm los ntawm 92% tom qab ntxiv 0.5mm mica spacers ntawm coils thiab hlau nplaum.

3. Sib nqus Circuit Court Design: Outsmart Thermodynamics

• Flux Keepers: Hlau daim hlau hla U-gap tswj txoj kev flux thaum lub sij hawm thermal shock.
• Ib nrab Magnetization: Khiav cov hlau nplaum ntawm 70-80% ntawm tag nrho saturation kom tawm "headroom" rau thermal drift.
• Kaw-Loop Designs: Embed U-magnets nyob rau hauv steel vaj tse kom txo tau cov huab cua raug thiab stabilize flux.

"Tus neeg saib xyuas tsim tau zoo txo ​​qhov kev pheej hmoo demagnetization los ntawm 40% ntawm 150 ° C vs. liab qab U-magnets."
- IEEE Kev Lag Luam ntawm Magnetics

4. Kev tiv thaiv kev ua haujlwm

• Derating Curves: Tsis txhob tshaj qhov ntsuas kub tshwj xeeb (saib daim duab hauv qab).
• Thermal Monitoring: Embed sensors ze U-legs rau lub sijhawm ceeb toom.
• Tsis txhob Cycling: Cov cua kub ceev / txias ua rau microcracks → demagnetization sai dua.

Derating Curve Piv txwv (N40SH Qib):

Br Loss │ 0% │ 8% │ 15% │ 30% *

5. Advanced Coatings & Bonding

• Epoxy Reinforcements: Sau microcracks los ntawm thermal expansion.
• High-Temp Coatings: Parylene HT (≥400 ° C) outperforms txheem NiCuNi plating saum 200 ° C.
• Kev xaiv Adhesive: Siv cov iav uas muaj epoxies (kev pabcuam kub> 180 ° C) los tiv thaiv cov hlau nplaum detachment.

Red Flags: Puas yog koj lub Magnet ua tsis tiav?

Tshawb xyuas cov theem pib demagnetization:

1. Teb Asymmetry:> 10% flux sib txawv ntawm U-ceg ( ntsuas nrog Hall sojntsuam).
2. Temperature Creep: Magnet xav tias kub dua li ib puag ncig - qhia txog qhov poob tam sim no.
3. Kev Ua Tau Zoo: Cov motors poob torque, sensors qhia drift, separators nco ferrous paug.

Thaum Kev Tiv Thaiv Tsis Ua Haujlwm: Salvage Tactics

1. Re-magnetization: Ua tau yog tias cov khoom tsis raug puas tsuaj (yuav tsum tau> 3T pulse teb).
2. Re-coating: Sawb corroded plating, rov siv cov txheej kub kub.
3. Hloov Cov Txheej Txheem: Sib pauv nrog qib SH / UH + kev hloov kho thermal.

Txoj Cai Yeej

Qib siab Hci + Thermal Buffering + Smart Circuit Design = Kub-Resistant U Magnets

U-shaped neodymium hlau nplaum zoo nyob rau hauv ib puag ncig hnyav thaum koj:

1. Xaiv SH/UH qib kev ntseeg rau> 120 ° C daim ntawv thov
2. Cais tawm los ntawm qhov chaw cua sov nrog cua / ceramic thaiv
3. Stabilize flux nrog cov tuav los yog vaj tse
4. Saib xyuas qhov kub ntawm qhov sib txawv