Demagnetizing Effects and Correction in Permeameter Measurements of Soft Magnetic Cylinders
| Autor: | Du-Xing Chen |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Physics Condensed matter physics Oscillation Demagnetizing field Type (model theory) Coercivity Magnetic hysteresis 01 natural sciences Electronic Optical and Magnetic Materials Cylinder (engine) law.invention law Significant error 0103 physical sciences Electrical and Electronic Engineering Permeameter |
| Zdroj: | IEEE Transactions on Magnetics. 55:1-10 |
| ISSN: | 1941-0069 0018-9464 |
| Popis: | The demagnetizing field $H_{d}$ produced by local magnetic poles around the ends of soft magnetic cylinders magnetized in International Electrotechnical Commission type-B permeameter is studied experimentally along the major hysteresis loop $M(H)$ . The usual relation of $H_{d}=-N_{p}M$ is shown to be valid with a positive demagnetizing factor $N_{p} , but at $H\sim \pm H_{cJ}$ , the intrinsic coercivity, the action of $H_{d}$ is anomalously characterized by an oscillation of $N_{p}$ from $-\infty $ to $\infty $ at $H=\pm H_{cJ}$ with increasing $\vert H\vert $ , owing to a local decrease of differential reluctance in the cylinder around where the maximum differential susceptibility occurs. These unusual demagnetizing effects make the $M(H)$ measured at high $\vert H\vert $ be rather accurate with often presented significant error at $H\sim \pm H_{cJ}$ . Having an over-large measured $H_{cJ}$ , this error is systematic, and it may be corrected with a shift in $H_{cJ}$ and a residual demagnetizing factor $\Delta N_{p} , if compared to demagnetizing corrected solenoid measurements of the same cylinders of large length-to-diameter ratio. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|