engineering recuitment UPCL AE (E&M) 2021 Mock Test Electrical Machines Single Phase Motor and Special Machines
As per double field revolving theory, a sinusoidally alternating flux can be looked upon as the combination of two revolving fluxes:
1
equal in magnitude to that of the alternating flux, rotating at synchronous speed in the same direction
2
of half the magnitude to that of the alternating flux, rotating at synchronous speed in the same direction
3
equal in magnitude to that of the alternating flux, rotating at synchronous speed in the opposite direction
4
of half the magnitude to that of the alternating flux, rotating at synchronous speed in the opposite direction