Why transformer is constant flux machine?
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When a load is connected to a transformer current, for example 12, flows through the secondary coil and an M.M.F. N212 is produced, this produces the secondary flux. This reduces the main flux induced and the E.M.F.E1 in the primary.
As a consequence more current is drawn from the supply. Additional current is drawn due to the load component 12'. This is anti-phase with 12. 12' sets a flux which opposes the secondary flux and helps the main flux.
The secondary flux produced by 12 is neutralized by the load component flux. N212 is balanced by the M.M.F. N112'. So the net flux is always at a constant level. The core loss is constant for all loads.
Therefore, a transformer is a constant flux machine.
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