QUESTION 4
(a) Derive the emf equation for the double wound transformer. [5 marks]
(b) Describe the principle of operation of the D.C machines operating on motor mode.
[5 marks]
1
Expert's answer
2021-10-12T01:54:07-0400
Induced emf according to Lenz’s lawe=−Ndtdϕe−Induced emfN−Turns of conductorsϕ−magnetic fluxt−timeϕ=ϕmsin2πfte=−Ndtd(ϕmsin2πft)e=−2πfNϕmcos2πftemax=2πfNϕmerms=2emaxerms=22πfNϕmerms=4.44fNϕm
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