Unit 5: Rotating Field Theory Flashcards

(6 cards)

1
Q

What producing a rotating magnetic field?

A

Balanced 3-phase supply with frequency ‘fs’ applied to symmetric 3-phase winding.

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2
Q

Voltages in the 3-phase winding

A

Va = Vmax * sin(ωt)
Vb = Vmax * sin(ωt - 2π/3)
Vc = Vmax * sin(ωt + 2π/3)

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3
Q

Summed Voltages in the 3-phase winding

A

Va + Vb + Vc = 0

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4
Q

Conditions [3]

A
  • Each pole accommodates all 3 phases
  • Displacement between adjacent phases is 120⁰
  • Start & Finish of each phase is 180⁰
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5
Q

Electrical Angle

A

θ = (P/2)*θmechanical

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5
Q

Synchronous Speed (Ns)

A

Ns = (120*fs)/P [rpm]

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