Question
Download Solution PDFIn a DC series motor, what is the relationship between speed and armature current?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
DC series motor:
- In DC series motor, armature, and field windings are connected in series.
- Induced EMF in DC series motor is given by:
E = V - IaRa
where E = induced emf
V= terminal voltage
Ia = armature current
Ra = armature resistancence
Explanation:
E = V - IaRa
kϕN = V - IaRa
N = \({V \over kϕ } - {{I_a}{R_a} \over kϕ }\)
In DC series motor, ϕ is proportional to Ia
N = \({V \over kI_a} - {{I_a}{R_a} \over kI_a }\)
N α \( {1\over I_a}\)
So, the speed armature current characteristics will be a rectangular hyperbola.
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