CAJ | 학술논문

建立了可变磁通永磁记忆电机永磁体连续去磁和重新充磁的磁化模型,给出了去磁时的回复线方程和充磁时的局部磁滞回线方程,采用有限元法对电机施加不同定子直轴电流时的磁通分布和永磁体内的磁通密度变化进行了分析,据此计算了电机永磁体在不同磁化状态时的气隙磁通密度、相磁链、相反电动势、每极气隙磁通等参数。文中给出了记忆电机连续去磁与充磁的有限元分析流程。设计制作了一台样机进行了实验验证,实验结果与有限元计算结果吻合较好。有限元计算与实验结果同时表明,记忆电机能实现连续近似线性去磁,但增磁特性呈非线性;永磁体的充磁比去磁困难,饱和充磁电流大约是完全去磁电流的4倍。
건립료가변자통영자기억전궤영자체련속거자화중신충자적자화모형,급출료거자시적회복선방정화충자시적국부자체회선방정,채용유한원법대전궤시가불동정자직축전류시적자통분포화영자체내적자통밀도변화진행료분석,거차계산료전궤영자체재불동자화상태시적기극자통밀도、상자련、상반전동세、매겁기극자통등삼수。문중급출료기억전궤련속거자여충자적유한원분석류정。설계제작료일태양궤진행료실험험증,실험결과여유한원계산결과문합교호。유한원계산여실험결과동시표명,기억전궤능실현련속근사선성거자,단증자특성정비선성;영자체적충자비거자곤난,포화충자전류대약시완전거자전류적4배。
In this paper,permanent magnet（PM） magnetization model of a variable flux PM memory motor（VFMM） under continuous de-and remagnetization is built,and recoil line equation under demagnetization and local hysteresis curve equation under remagnetization are given.Flux density variation in PM and flux distributions of VFMM under the role of different stator d-axis currents are analyzed by finite element（FE） method incorporating with the magnetization model.No-load air-gap flux density waveforms,phase flux-linkages,phase back EMFs and air-gap flux per pole are calculated at different PM magnetization states.The FE analysis flowchart of PM continuous de and remagnetization is given in this paper.A prototype machine is designed and tested.Good agreement between calculated and measured results is achieved.It shows that the continuous demagnetization of VFMM is approximately linear,but the re-magnetization performance is nonlinear.Compared with the PM demagnetization,the remagnetization of PM is more difficult.About 4 times the full de-magnetizing current is required to achieve the full remagnetization of PM.