{"id":1978,"date":"2018-03-13T14:04:37","date_gmt":"2018-03-13T06:04:37","guid":{"rendered":"http:\/\/dh.boyo.org.tw\/rctlee\/?p=1978"},"modified":"2018-03-13T14:04:37","modified_gmt":"2018-03-13T06:04:37","slug":"%e6%95%99%e8%82%b2%e5%b0%88%e6%ac%84-107-%e4%bb%bb%e4%bd%95%e5%ad%a9%e5%ad%90%e9%83%bd%e5%8f%af%e4%bb%a5%e6%95%99%e5%a5%bd%e7%9a%84","status":"publish","type":"post","link":"https:\/\/doc.boyo.org.tw\/rctlee\/?p=1978","title":{"rendered":"\u6559\u80b2\u5c08\u6b04 (107) \u4efb\u4f55\u5b69\u5b50\u90fd\u53ef\u4ee5\u6559\u597d\u7684"},"content":{"rendered":"

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\n

Consider Fig. 6-1.  In Fig. 6-1, there are a number of permanent magnets around a circle and a coil with current flowing in the middle.  The rotor is the coil.<\/p>\n

\u8003\u616e\u57166-1\u3002 \u5728\u57166-1\u4e2d\uff0c\u5713\u5468\u570d\u6709\u8a31\u591a\u6c38\u4e45\u78c1\u9435\u548c\u4e2d\u9593\u6709\u96fb\u6d41\u7684\u7dda\u5708\u3002 \u8f49\u5b50\u662f\u7dda\u5708\u3002<\/p>\n

\"\"<\/p>\n

Fig. 6-1  An AC motor with the coil as the rotor<\/p>\n

 <\/p>\n

Suppose the current flowing through the coil is such that the top of the coil is of the N magnetic polarity.  Then this will cause the rotor to rotate.  But as soon as the rotor meets the second permanent magnet, it will stop as can be seen in Fig. 6-2.<\/p>\n

\u5047\u8a2d\u6d41\u904e\u7dda\u5708\u7684\u96fb\u6d41\u4f7f\u5f97\u7dda\u5708\u7684\u9802\u90e8\u5177\u6709N\u500b\u78c1\u6975\u6027\u3002 \u90a3\u9ebc\u9019\u5c07\u5c0e\u81f4\u8f49\u5b50\u65cb\u8f49\u3002 \u4f46\u662f\uff0c\u4e00\u65e6\u8f49\u5b50\u8207\u7b2c\u4e8c\u500b\u6c38\u4e45\u78c1\u9435\u76f8\u9047\uff0c\u5b83\u5c07\u505c\u6b62\uff0c\u5982\u57166-2\u6240\u793a\u3002<\/p>\n

\"\"<\/p>\n

Fig. 6-2 The state when the rotor meets the second permanent magnet<\/p>\n

 <\/p>\n

If as soon as the rotates to meet the second permanent magnet, the magnetic polarity of the coil is changed as shown in Fig. 6-3.  Then the rotor will continue to rotate as long as the magnetic polarities of the rotor keep changing appropriately.<\/p>\n

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\"\"<\/p>\n

Fig. 6-3 The changing of the polarity of the coil<\/p>\n

 <\/p>\n

The question is:  How can we change the polarities of the coil continuously?  Note that the magnetic polarities of a coil are determined by the direction of the current flowing through it.  Thus we may use the alternating current (AC) which changes its direction continuously.<\/p>\n

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Consider Fig. 6-4. <\/p>\n

\"\"<\/p>\n

Fig. 6-4  Alternating current<\/p>\n

In Fig. 6-4, we can see that the current is sometimes positive and sometimes negative as shown in Fig. 6-5.  In an alternating current, the direction of the current is changed continuously.<\/p>\n

\u5728\u57166-4\u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u770b\u51fa\uff0c\u96fb\u6d41\u6709\u6642\u662f\u6b63\u7684\uff0c\u6709\u6642\u662f\u8ca0\u7684\uff0c\u5982\u57166-5\u6240\u793a\u3002 \u5728\u4ea4\u6d41\u96fb\u4e2d\uff0c\u96fb\u6d41\u65b9\u5411\u9023\u7e8c\u8b8a\u5316\u3002<\/p>\n

\"\"<\/p>\n

Fig. 6-5  The direction of current<\/p>\n

 <\/p>\n

If we supply an AC current into the coil as shown in Fig. 6-6.<\/p>\n

\"\"<\/p>\n

Fig. 6-6  AC supplied to the coil<\/p>\n

 <\/p>\n

Since the direction of the current flowing through the coil changes continuously, the polarities of the coil change continuously.  This is how we may achieve the state when the coil meets the second permanent magnet as shown in Fig. 6-7.<\/p>\n

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\"\"<\/p>\n

Fig. 6-7  The changing of the polarities of the coil due to the AC current<\/p>\n","protected":false},"excerpt":{"rendered":"

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