A dc series motor drives a fan-type load. At rated current, the motor speed is 600 rpm. If a resistance equal to 0.25 of the field resistance shunts the field winding, what is the approximate motor speed?
What will be an ideal response?
This problem is under specified; significant additional data is required to solve the
problem correctly. We can solve the problem by making some simplifying
assumptions. (Full credit is given in the grading for any reasonable work done.)
Let the current for the case where there is no resistance in parallel with the field
be Ia1 and let the new current be Ia2. Since the current is fan-type,
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What will be an ideal response?
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