Speed regulation and torque control of electrical machine for vehicle testing

摘要

The procedure involves setting the current of the electrical machine so that it creates a shaft moment, via the air gap moment of the machine, which corresponds to the required positive or negative limiting moment of an overlaid speed control, or the target moment of the selective torque control. A switch (6) selects as input either a value calculated from the target speed and existing speed of the machine (12), or the output of a circuit which generates a target torque. The output of the switch (6) is processed by an adder (3.2) and a torque calculator (10). This takes into account the frictional losses of the machine and its flux to generate the appropriate armature current in the machine (12) via a divider (7) and a current regulator (11).