共查询到16条相似文献,搜索用时 78 毫秒
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设计了一种基于LM3S615微控制器的开环变频调速系统。论述了变频调速系统软硬件的设计方案,对整个系统的主回路、驱动电路、保护电路、控制电路及软件系统进行了系统的阐述。主电路部分给出了整流、滤波、逆变器、开关管驱动电路等外围器件的参数计算。控制电路以LM3S615实现SPWM信号的输出。设计时基于对系统安全性的考虑,加入了系统的保护电路。该交流小功率变频器不仅具有功耗低、成本低的特点,而且具有结构简单、运行可靠等优点。 相似文献
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早期的永磁材料性能不佳,绝大部分电机不得不采用电激磁形式.生产中所用的电机及电工学中所讲的电机,只有少数微特电机是永磁式的.目前.在研制和生产领域中,这种局面正在发生变化.由于近年来永磁材料的性能指标大幅度提高.使用永磁体时.电机气隙中形成的磁场已可超过感应电机的气隙磁场,同时电机的效率和功率因数等性能指标也可提高,于是各类永磁电机异军突起,不用说微特电机, 相似文献
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根据永磁电动机的结构特点,在基本假设的基础上,建立了永磁电动机转子二维温度场求解模型。通过温度场微分方程的建立以及各类边界条件的给定,特别是相应的损耗、散热系数的确定。采用有限元法对永磁电动机转子二维温度场进行数值求解,并将数值计算结果和实验数据进行了对比研究,佐证了本研究所采用的研究方法的合理性以及求解域确定的正确性。 相似文献
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永磁电机具有效率高、功率密度高以及可靠性高等优点,目前已成为我校运动控制课程的重要教学内容之一。区别于传统的直流电机或者感应电机教学实验平台,永磁电机控制系统要求位置、转速和电流的闭环控制系统。为适用实验教学的要求,设计开发了一套基于数字信号处理器(DSP)的永磁电机实验教学平台,并给出了实验项目实例。该实验平台为相关专业学生提供良好的实践环境。 相似文献
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宋建萍 《南通职业大学学报》2003,17(1):65-68
A3977是Allegro公司推出的一种新型的步进电机驱动集成电路。本结合其内部结构讨论其功耗低、电流输出大、有效的电流控制、简便的转换接口等特点。中还指出了应用中应注意的问题。 相似文献
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永磁直线同步电机磁阻力优化的设计 总被引:1,自引:0,他引:1
The detent force of a permanent magnet linear synchronous motor (PMLSM) is analyzed and the corresponding optimization methods are presented to reduce it. The detent force, which is divided into two components, i.e. resulting from the end effect and resulting from the slotting effect, can be analyzed respectively by the finite element method (FEM). To reduce the detent force arising from the end effect, several optimal design techniques are utilized, namely, adopting the suitable length and end shape of the primary armature. The detent force resulting from the slotting effect is reduced by means of skewing and adjusting the width of the magnets mounted on the secondary armature, and adopting the fractional slots of the primary armature. The validity of the analytical detent force predictions and the effectiveness of the detent force reduction techniques are verified by the experimental measurements. 相似文献
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A novel elevator door driven by tubular permanent magnet linear synchronous motor (TPMLSM) is presented. This TPMLSM applies axial magnet array topology of the secondary rod, air-cored armature windings and slotless structure of the forcer to improve the stability of the thrust. The influence of two major dimensions, the pitch and radius of the permanent magnet (PM), on magnetic field was studied and the best values were given by the finite element analysis (FEA). The magnetic field, back EMF and thrust of the motor were analyzed and the PM size was optimized to reduce the harmonic components of the magnetic field and improve the performance of the motor. Predicted results are validated by the experiment. It is shown that the performance of the motor and the novel elevator door system is satisfying. 相似文献
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倪红 《福建工程学院学报》2016,(6):581-586
分析电动汽车轮毂电机特性,给出一种电动汽车轮毂电机场路耦合分析法,将电磁场有限元模型和外部电路直接耦合到一起,场路耦合分析模型充分考虑到外电路中电流谐波的影响,分析结果更符合实际情况。仿真分析了轮毂电机气隙磁密、负载感应电势等特性,轮毂电机空载起动、加载和卸载等工况,并通过样机试验验证,实验测试结果与场路耦合法计算结果能够较好的吻合。 相似文献
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We propose a novel kind of compound permanent magnet synchronous machine (CPMSM), which is applicable in low-speed and high-torque situations. We first explain the structure of the CPMSM. Based on theoretically deducing the calculation formulae of the CPMSM electromagnetic parameters, we analyze the operating characteristics of the CPMSM, and obtain the power-angle curves and working curves. The no-load magnetic field distribution and the cogging torque are analyzed by applying the finite element method of three-dimensional (3D) magnetic fields, to determine the no-load leakage coefficient and the wave0form of the cogging torque. Furthermore, the optimal parameters of the permanent magnet for reducing the cogging torque are determined. An important application target of the CPMSM is in direct-drive pumping units. We have installed and tested a directdrive pumping unit in an existing oil well. Test results show that the power consumption of the direct-drive pumping unit driven by CPMSM is 6 1. 1% of that of the beam-pumping unit, and that the floor space and weight are only 50% of those of a beam-pumping unit. The noise output does not exceed 58 dB in a range of 1 m around the machine when the machine is 1.5 m from the ground. 相似文献