退磁曲线

用X射线衍射仪、光学金相显微镜、透射电镜和扫描电镜研究了磁体的结构；用磁强自动记录仪测量了磁体的退磁曲线。

The structure of the magnet was investigated by XRD , optical microscope , TEM and SEM , and its demagnetization curve was tested by magnetograph .

Nd-Fe-B磁体退磁曲线方形度与烧结过程的关系

Variation of the Demagnetization Curve Rectangularity of Nd-Fe-B Magnets With Sintering Process

影响烧结Nd-Fe-B磁体退磁曲线方形度的因素

The Factors Affecting the M-H Loop Squareness of Sintered Nd-Fe-B Magnets

对退磁曲线线性度较好的磁体，提出一种用数学方法计算磁体B＝f（H）关系和磁通损失数学表达式的方法。

The method of calculation of demagnetizing curve and magnetic flux loss based on magnets with good linearity of demagnetizing curve have been showed in this paper .

结果表明，适量Ga元素的添加能有效提高磁体退磁曲线的方形度，进而提高磁体的最大磁能积。

The results suggest that adding proper gallium could improve the squareness of the demagnetization curve and increase the maximum energy product of the magnets .

烧结Nd-Fe-B磁体的富氧表层导致在磁体的退磁曲线上表现出明显的台阶特征。

The oxygen-rich layer of Nd-Fe-B sintered magnet is responsible for the typical step of the demagnetization curve of the magnet .

Fe-Mn-Ti合金在冷加工后于540℃左右高温回火可以得到较高的磁矫顽力。本研究用退磁曲线测量；

The cold worked Fe-Mn-Ti alloy after tempering at ~ 540 ℃ can get relatively high value of coercive force .

定量描述了Nd-Fe-B磁体J-H退磁曲线方形度与烧结过程的关系，分析了相对密度、晶粒尺寸及其分布对磁体J-H退磁曲线方形度的影响规律。

A quantitative description of variation of the demagnetization curve rectangularity of Nd-Fe-B magnets with sintering process and a study of the effect of relative density , grain size and its distribution on the demagnetization curve rectangularity of Nd-Fe-B magnets are presented in this paper .

磁体的B-H退磁曲线在500℃时保持为直线，内禀矫顽力温度系数β（25℃~500℃）为–0.16%/℃，最高使用温度达到533℃。

The B-H demagnetization curve maintained at a straight line at 500 ℃, the intrinsic coercivity coefficient β ( 25 ℃ ~ 500 ℃) was - 0.16 % / ℃, and the maximum operating temperature was up to 533 ℃ .

稀土永磁材料退磁曲线的计算及应用

Calculation of Demagnetizing Curve of Rare Earth Permanent Magnets and its applications

永磁材料退磁曲线的几何作图法

An approximate graphic method to construct the demagnetization curve for permanent magnetic materials

退磁曲线具有理想的方形度。

The Demagnetization curve has a perfect squareness .

退磁曲线法和磁导法的磁力泵耦合器转矩分析

Analysis on Torque of Magnetic-force Pump Coupler Based on Demagnetization Curve and Magnet Conductivity Methodology

纳米复合磁体退磁曲线的计算

The calculation of nanocomposite magnets

提高相对密度、减小平均晶粒尺寸并使晶粒尺寸分布均匀，是磁体J-H退磁曲线具有良好方形度的必要条件。

It is necessary to enhance relative density , reduce grain size and narrow its distribution for Nd-Fe-B magnets to have excellent demagnetization curve rectangularity .

在一定温度下，永磁体退磁曲线上拐点位置的高低不但影响着永磁体用量，还直接影响着电机运行的可靠性。

On definite temperature , the knee point of pm material affects not only the volume of material but also the reliability of pm machine .

当相对密度低于约98.5%时，相对密度对磁体J-H退磁曲线方形度的变化起主要作用；

If relative density is less than 98.5 % , the relative density value is a decisive factor for the improvement of the demagnetization curve rectangularity of Nd-Fe-B magnets ;

利用通过退磁曲线法获得的磁力泵耦合器能量通用公式，导出了内磁转子在周向偏离平衡点时所产生的周向传动转矩的计算方法；

An universal energy equation of magnetic-force pump coupler was educed by analysis of demagnetization curve and ways of calculating circumferential torque were introduced according to the equation when inside magnet rotor had circumferential moment .

在前面测试基础上，结合永磁体的磁性参数之间的关系以及退磁曲线与内禀矫顽力曲线的性质，分析推导出影响热稳定性的两个主要参数拐点位置和温度系数的计算公式。

Basing on the measurement results before and combined with the relationship of magnetic parameters of permanent magnet and the character of demagnetization curve , calculating formulas of the position of knee point and temperature coefficient were analyzed and given .

研究发现，常温25℃下磁体只有起始最低工作点低于其退磁曲线拐点时才会发生失磁现象，且随着磁场交变频率的升高，磁体失磁程度逐渐增大。

At normal temperatures ( 25 ℃), the loss of excitation occurs only when the initial excitation is below the inflexion of the demagnetization curve of the Nd-Fe-B material and higher alternating magnetic field frequencies cause the Nd-Fe-B material to more rapidly lose its excitation .

从退磁过程半对数曲线的斜率可以求得平均flip-flop时间。自旋扩散系数可以由此估算。

The average flip-flop time can be deduced from the slope of the semilogarithm curve of depolarization , and the spin diffusion coefficient can thus be estimated .