A robot manipulator with a dc, separately excited motor on the driving end has ratings similar to these given in Problem 6.11. The motor is running at full load and is used to drill holes in solid material. If the field current is decreased to 80% of the rated value by using a solid-state converter in the field circuit, what is the percentage change in its speed?
What will be an ideal response?
Since the load is a drilling machine,
At full load and rated speed,
When flux is reduced to 80% of the rated value:
We also have,
Solving the quadratic equation and ignoring the very small value of speed,
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