A single-phase alternator produces at no-load an electromotive force E-230 V of frequency f= 50 Hz. The rotor rotates at a speed n=1000 r.p.m. The synchronous impedance of the stator winding is Z-1.5 Q and its resistance is negligible. 1) Calculate the number of poles of the alternator. 2) Calculate the reactance (X.) of the stator winding. 3) Calculate the flux per pole (0) knowing that the number of stator conductors is 120 and Kapp's coefficient is 2.1

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A single-phase alternator produces at no-load an electromotive force E-230 V of frequency f= 50 Hz.
The rotor rotates at a speed n=1000 r.p.m.
The synchronous impedance of the stator winding is Z-1.5 Q and its resistance is negligible.
1) Calculate the number of poles of the alternator.
2) Calculate the reactance (X.) of the stator winding.
3) Calculate the flux per pole () knowing that the number of stator conductors is 120 and Kapp's coefficient is 2.1
4) The alternator feeds a resistive load which absorbs a current of intensity I-40A. Calculate:
a) The voltage across the terminals of the load (U).
b) The useful power of the alternator (P₁).
Transcribed Image Text:A single-phase alternator produces at no-load an electromotive force E-230 V of frequency f= 50 Hz. The rotor rotates at a speed n=1000 r.p.m. The synchronous impedance of the stator winding is Z-1.5 Q and its resistance is negligible. 1) Calculate the number of poles of the alternator. 2) Calculate the reactance (X.) of the stator winding. 3) Calculate the flux per pole () knowing that the number of stator conductors is 120 and Kapp's coefficient is 2.1 4) The alternator feeds a resistive load which absorbs a current of intensity I-40A. Calculate: a) The voltage across the terminals of the load (U). b) The useful power of the alternator (P₁).
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