Rotating
magnetic Field due to two phase winding
- Let us consider that the two winding P and Q are placed at 90o with respect to each other.
- We assume that when the two phase supply is given to the winding, flux produces in each winding is purely sinusoidal.
- The waveform of the flux is shown in the figure B.
- The direction of the flux is assumed as positive whereas its opposite sides indicates negative values. The instantaneous value of flux can be given by
FP
= Fm
Sin θ
FQ
= Fm
Sin ( θ – 90o )
Point
1
- FP
= 0 and
- FQ
= – Fm
- Resultant flux F
= √ P2 + Q2 – 2PQCos θ
= √ 0 + ( – Fm
)2 – 0
= Fm
Point
2
- FP
= Fm
/ √ 2 and
- FQ
= – Fm
/
√ 2
- Resultant flux F
= √ P2 + Q2 – 2PQCos θ
= √ Fm2
/
2 + Fm2
/
2 + 0
= Fm
Point
3
- FP
= Fm
and
- FQ
= 0
- Resultant flux F
= √ P2 + Q2 – 2PQCos θ
= √ ( Fm
)2 + 0
= Fm
Point
4
- FP
= – Fm
/ √ 2 and
- FQ
= Fm
/
√ 2
- Resultant flux F
= √ P2 + Q2 – 2PQCos θ
= √ Fm2
/
2 + Fm2
/
2 + 0
= Fm
Conclusion
- The rotating
magnetic field produced by two phase winding is constant in magnitude.
- It rotates at constant
synchronous speed in the clockwise direction
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