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职业高级中学文史类全一册物理课本中,单相交流电动机一节,共有16行文字,其中有如下问题,学生感到难学,教师觉得难教。 1.单相交流电的磁场,为什么可以看作两个相反方向旋转的磁场; 2.当转子静止时,工作绕组通入单相交流电时,为什么转子不旋转; 3.“拨拨转”,即拨动一下才能转起来,这是什么道量; 4.启动装置是什么?
There are 16 lines of single-phase AC motors in the physics textbooks of the senior and junior high school literature and history class, among which there are the following problems. Students find it difficult to learn and teachers find it difficult to teach. 1. The magnetic field of a single-phase alternating current can be seen as two magnetic fields rotating in opposite directions. 2. When the rotor is stationary, when the working winding is connected to a single-phase alternating current, why does the rotor not rotate? 3. “Dial to turn”, ie What can be done by turning it around? 4. What is the starting device?