I have a question regarding the famous statement regarding DC series motors, that is: DC series motors have the highest torque as torque is proportional to armature current squared.
I have read in a nice book that this is actually meaningless as if we are to compare two machines of the similar torque, they will have almost the same size and cost (I can send the ebook).
So, do you believe that this statement is actually expressing an advantage of DC series motors?
Two machines can have same size and cost, but they may not have same efficiency, voltage and current ratings. A dc motor uses very less power, has good torque-speed characteristics, uses dc power (biggest advantage) and so on...
It also has easy speed control techniques as well as easy starting methods.
DC motors of series excitation really have the highest torque, it is not for nothing that these types of motors were previously used in propulsion systems on ships. The only drawback of these types of motors is the "runaway" mode due to the low load on the shaft.
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