1) magnetic anomaly
弱磁性异常
2) field weakening
弱磁
1.
Based on the analysis of the field weakening operation of asynchronous motor, a maximum torque control method was proposed for the field weakening of asynchronous motor to satisfy the higher torque output of motor driven system in electric vehicle.
对异步电机的弱磁运行作了深入分析,给出了弱磁运行时最大转矩控制的实现方法,可满足电动汽车对电机驱动系统的高转矩输出要求,实现方法简单可靠。
2.
A novel field weakening scheme for electric vehicles induction motor drive system is presented, which gives a solution to torque decreasing problem during field weakening region.
针对弱磁阶段电机转矩下降的问题,在弱磁阶段电压控制策略的基础上,通过适当的选择漏感,提出了一种简化的电压控制策略。
3) low intensity magnetic
弱磁
1.
Through the research,the dephosphorizing process of low intensity magnetic-high intensity magnetic-shacking table separation was selected.
通过工艺研究,最后选择弱磁—强磁—摇床精选的工艺流程,加强矿物的细磨,是铁矿降磷和提高精矿指标的重要措施。
2.
By the research,the dephosphorizing process of low intensity magnetic-high intensity magnetic shacking table separation is selected.
通过工艺研究,最后选择弱磁-强磁-摇床精选的工艺流程,加强矿物细磨是铁矿降磷和提高精矿指标的重要措施。
4) Flux-weakening
弱磁
1.
Parameter influence on flux-weakening performance of IPM;
永磁电机的弱磁性能与电机参数的关系
2.
Permanent magnet brushless DC motors (PM BLDCM)have narrow flux-weakening operation region,which restrict to use for high speed applications and traction systems.
分析了造成永磁无刷直流电机弱磁运行区间过窄的一个关键因素——逆变电路环流;提出了一种新型驱动拓扑电路,此新型电路结构在传统三相逆变桥的基础上,在每个半桥臂下方反向串联一个相同的功率器件,同步控制其通断,达到消除逆变环流的效果。
3.
Considering the flux-weakening application, effect of the d-axis inductance is described, whilst the influence of the rotor pole height and width on the d-axis inductance and flux-weakening capability is analyzed with finite element method (FEM).
介绍了三相6/5极永磁开关磁链电机的结构特点和运行原理,并在弱磁扩速原理的基础上说明了直轴电感在电机弱磁扩速中的作用,通过有限元分析研究了不同转子齿高、齿宽对电机直轴电感和弱磁能力等性能的影响。
5) field-weakening
弱磁
1.
In vector-controlled PM brushless ac drives, the d-axis and q-axis currents are controlled according to optimal current profiles derived from a mathematical model, usually for maximum torque per ampere in the constant torque operating range and maximum power in the field-weakening range.
在矢量控制的永磁同步电机控制系统中,d轴和q轴电流的控制一般是根据电机数学模型推导的最佳性能轨迹,如恒力矩区的每安培电流最大力矩控制和弱磁区的最大功率控制。
2.
In addition,the field-weakening method is proposed.
介绍了间接转矩控制的基本原理,通过一种新型的全阶状态观测器能同时准确观测定子磁链和转子磁链,并加入弱磁控制算法,将间接转矩控制扩展到全速度范围。
3.
A novel field-weakening scheme for brushless DC motors based on instantaneous reactive power theory is introduced in this paper.
介绍了一种基于瞬时无功功率理论的永磁无刷直流电动机弱磁调速新策略,通过控制无功分量s/ω达到弱磁的效果。
6) flux weakening
弱磁
1.
Flux Weakening Technology Study on Permanent Magnet Brushless D.C.Motor;
永磁无刷直流电机弱磁技术研究
2.
The structural characteristic of permanent magnet synchronous motor that adapted for flux weakening operation was analyzed.
分析了适合弱磁运行的永磁同步电动机的结构特点,从本体和控制两个方面介绍了永磁同步电动机的弱磁方法,指出各种方法的优缺点。
3.
A permanent magnet synchronous motor (PMSM) with controllable exciting magnetic flux is presented which provides a new approach for solving the problem of flux weakening for PMSM.
为解决永磁同步电动机弱磁问题,提出了一种能够跟随转速自动调节励磁磁阻的新型永磁同步电动机。
参考词条
补充资料:磁性材料2.薄膜磁性材料
磁性材料2.薄膜磁性材料
Magnetie Materials 2.Thin Film
在一定外加磁场作用下,其反磁化畴(磁矩取向与外磁场方向相反的畴)变为圆柱形磁畴。从膜面上看,这些柱形畴好像浮着的一群圆泡,故称磁泡或叫泡踌(另见磁性材料2.昨晶态磁性材料)。在特定的电路图形、电流方向和一定磁场情况下,可做到控制材料中磁泡的产生、传翰和消失,实现信息的储存和逻辑运算的功能。磁泡的直径在微米量级(0 .5~5协m),每个磁泡的迁移率在1 .26~12.6em八s·A/m)〔 102一i03cm八s·oe)〕,因而可制成存储密度为兆位/cmZ(Mbit/cmZ)和数据处理速率为兆位/s(M肠t/s)的运算器件。磁泡器件经过近20年研究和开发,已取得广泛的实际应用。 对磁泡材料的主要要求是:(l)各向异性常数凡>粤斌,磁化强度从>外磁场强度H;(2)杂质缺陷小,2一~”~’.J泌~-一‘产’~~一~一’、~尹一~~~’J”均匀性好。目前研究得比较清楚的有铁氧体单晶薄膜和稀土一过渡金属薄膜。从制备工艺和性能稳定、器件开发等情况看,以铁氧体磁泡材料比较成熟,早期是用钙钦石型铁氧体单晶片来作磁泡材料,后为YIG单晶薄膜所取代。它是用液相外延法在Gd3Ga5OI:(简称GGO)基片上生成的单晶薄膜,其厚为微米量级。表4为稀土石榴石R3FesolZ的磁性;表5为一些磁泡材料的基本特性数值。农4稀土石抽石R.Fe‘ol,的磁性┌───────────┬────┬────┬────┬────┬────┬────┬────┬────┬─────┬────┬────┐│R │Y │Sm │EU │Gd │Tb │Dy │、Ho │Er │T】11 │Yb │Lu │├───────────┼────┼────┼────┼────┼────┼────┼────┼────┼─────┼────┼────┤│补偿温度,~p,K │ 560 │ 560 │ 570 │ 290 │ 246 │ 220 │ 136 │ 84│4
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