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【单选题】
在诸多交流调整系统中，以变频调速的性能最好、调整范围大、静态稳定性好、运行效率高。有关变频调速的工作原理分述如下，描述中哪一项是不正确的?( )A.
改变交流电动机的供电频率，可以改变其同步转速，实现调速运行
B.
对于工业中大量使用的异步电动机，进行调速控制时，希望将电动机的主磁通保持为额定值不变，并能按要求进行控制
C.
保持电动机的气隙主磁通不变的目的，是为了保持电动机的负载能力；而按要求对主磁通进行控制则是为了进行恒功率控制
D.
为进行恒功率控制，当电动机由额定频率向上增大时，其主磁通应随之向上增大
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A.
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