Question
Download Solution PDFA 3 – phase semi-converter is feeding a separately excited dc motor at constant field current. The motor can operate in the following condition:
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
3ϕ semi converter fed separately excited dc motor:
Voltage equation of 3ϕ semi converter fed separately excited dc motor
\({E_a}\left( α \right) = \frac{{3\sqrt 3 \;{E_m}}}{{2\pi }}\left( {1 + cosα } \right)\)
Where
Ea = output voltage
α = Firing angle
A separately excited dc motor operating in the first quadrant is fed form 3 - φ semi-converter, the free-wheeling diode is open-circuited.
If the freewheel diode is open-circuited, in the output voltage waveform there is some portion of negative voltage so the motor operates in first and second quadrants.
The diagram of 3ϕ semi converter fed DC motor and waveform given below:
Last updated on Jul 2, 2025
-> ESE Mains 2025 exam date has been released. As per the schedule, UPSC IES Mains exam 2025 will be conducted on August 10.
-> UPSC ESE result 2025 has been released. Candidates can download the ESE prelims result PDF from here.
-> UPSC ESE admit card 2025 for the prelims exam has been released.
-> The UPSC IES Prelims 2025 will be held on 8th June 2025.
-> The selection process includes a Prelims and a Mains Examination, followed by a Personality Test/Interview.
-> Candidates should attempt the UPSC IES mock tests to increase their efficiency. The UPSC IES previous year papers can be downloaded here.