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&lt;/script&gt;</html><description>One electromotor serviceman who worked in a small workshop needed an ac power supply with 100HZ frequency. He knew that in synchronous generator, if the magnetic flux of the field system is distributed perfectly sinusoidal around the air gap, then e.m.f generated in each full-pitched armature coil will be sinusoidal completely. He had an old &hellip;  &#x627;&#x62F;&#x627;&#x645;&#x647; &#xBB;</description></oembed>
