Efficiency and operating point of DC and AC standard motors

The motor constant makes it possible to design the nominal point of DC motors corresponding to the process requirements.
However the efficiency of AC motors is better (> 55 kW: approx. 1 ... 4 % depending on cooling method).
DC motors are often utilized according to insulation class H. Standard AC motors are used to be utilized according to insulation
class B. This results in a possible higher efficency with AC motors.

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