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【简答题】
一台磁路不饱和的四极它励直流发电机，P N =11千瓦，U N =230伏，n N =1450转/分｡电枢绕组为，总导体数N=620根，电枢回路总电阻（包括电刷接触电阻）为0.38欧，求： ⑴满载运行时的每极磁通和电磁转矩； ⑵如果负载电阻､转速及励磁电流保持不变，将电刷向某个方向移动后，负载电流增加了10%，问此时磁通如何变化？原因是什么？改变后的数值是多少？
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