There are three speed control methods in a shunt DC motor -(adsbygoogle = window.adsbygoogle || []).push({});

Field resistance control

Terminal voltage control

Armature resistance control

In the field/flux control method induced torque decreases and speed increases due to decrease in flux, that is why power remains constant. This is what I got from the book.

I want to know if there is any other explanation about why the output power remains constant or is there any mathematical proof?

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# Homework Help: Why is maximum output power constant in field resistance control method?

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