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根据CAI系统的特点,阐述了将CAI引入电机学实验教学的性,并简要介绍了电机学实验CAI系统的总体构思和设计方法。 相似文献
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"电机学"课程具有概念多、理论性强等特点,历来是学生学习的难点.结合笔者在教学实践中对教学方法的创新和探索,介绍了模块式、问题式、类比式、铺垫式、换位式等教学方法及其效果. 相似文献
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建构主义学习理论强调:人类知识不是纯客观的;学习者的知识不是由教师传授得到的,而是自己建构的;知识不是独自形成的,而是在与外部环境的交互过程中形成的;学习者是学习的主体,而不是被灌输的对象等认知理论观点。因而,建构主义学习理论指导下的课堂教学设计研究的重点应是以学生为中心,着重强调对学生的"课堂氛围"、"思维技能"、"协作学习"以及"先行组织者"等进行分析和构造,以激发学生原有的相关经验,激活学生高水平的思维活动,促进新旧知识经验的相互作用,从而让新知识在原有经验的基础上"生长"起来,促进学生完成意义建构。 相似文献
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建构主义学习理论在课堂教学设计中的应用 总被引:1,自引:1,他引:1
建构主义学习理论强调:人类知识不是纯客观的;学习者的知识不是由教师传授得到的,而是自己建构的;知识不是独自形成的,而是在与外部环境的交互过程中形成的;学习者是学习的主体,而不是被灌输的对象等认知理论观点。因而,建构主义学习理论指导下的课堂教学设计研究的重点应是以学生为中心,着重强调对学生的"课堂氛围"、"思维技能"、"协作学习"以及"先行组织者"等进行分析和构造,以激发学生原有的相关经验,激活学生高水平的思维活动,促进新旧知识经验的相互作用,从而让新知识在原有经验的基础上"生长"起来,促进学生完成意义建构。 相似文献
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本文在分析了传统"电机学"教学存在的问题的基础上,提出了提高教学质量的途径,并从教材、理论教学、实践教学和考核制度四个方面介绍了提高教学质量的措施. 相似文献
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针对"电机学"课程的教学,结合多个实例简述在教材选择、课堂教学、实践教学环节中应该注意的问题,以及应该采取的方法和手段.实践表明,采用这些方法和手段有利于提高"电机学"课程的教学质量. 相似文献
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电机电磁计算中的各种磁导率 总被引:2,自引:0,他引:2
本文讨论电机中铁磁材料的各种不同的磁导率,介绍了典型的凸极同步电机转子材料增量磁导率的测量结果,并给出了电机定,转子铁心典型材料的各种磁导率,文章最后还给出了应用不同磁导率计算变频器供民的同步电机运算电感的实例。 相似文献
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ABSTRACT The effect of sinttinq in permanent magnet electric machines differs from that in wound field ones. An analytically extended field model for slotted permanent magnet machines is presented in this paper. By using the model, the Carter's coefficient for permanent magnet machines can be easily deduced from the Carter's classical formula. The closed-form solution to the problem at hand is exact and much simpler than that of previously approximate methods. 相似文献
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ABSTRACT To predict the fringing flux distribution along the axial length of a permanent magnet electric machine, a segmented permanent magnet model, in which magnets face a slotted and infinitely permeable boundary, is presented in this paper. By using the model and the method of Fourier expansion, the analytical solution to the fringing field problem can be easily determined. With the aid of the analytical results, the effective armature length for permanent magnet electric machines due to the axial extension of the magnet may be obtained. 相似文献
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发展高效节能电机是节约能源和保护环境的客观要求,是科学技术进步的必然趋势,同时也是三相交流电动机的发展方向。 相似文献
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The design procedure for electric drives operating in a zone of large overloads or having the motor with unconventional rotor design is presented. The calculation of the magnetic system is based on the finite-element method. In addition, the settings for the phase currents come from the control system. To reduce the time of calculation, an algorithm for parallelizing the calculations by the criterion of maximum acceleration was developed. A determination of the possibilities of design procedures depending on the number of processors and the nature of the problem to be solved is presented. It is shown that, if an electric drive has small overloads and they are in the tolerance zone, then it is more appropriate to give a preference to simplified design models and the parameters of an electric machine can be replaced by lumped ones. If an asynchronous electric drive operates with larger overloads (with an impact character of the torque of resistance or when frequent starting-brake operating modes with relatively large dynamic torque), it is appropriate to use refined design procedures. Electric drives with a complicated configuration of the magnetic system—for example, drives with a synchronous reluctance machine—require taking the distributed nature of the motor magnetic system into account. Moreover, there are electric-drive operating modes in the zone of large overloads by torque and with angles β < 30°, when higher demands are placed on the initial data of the design model. 相似文献
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本文综述电机绝缘老化后剩余寿命的试验及理论预测方法(包括非破坏性参数法;运行经历预测剩余寿命的方法;热电综合老化预测法及破坏性试验预测法等)。最后的实例分析计算得出极为满意的结果。 相似文献