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EJERCICIO
Un motor de inducción de jaula de ardilla de ocho polos, 60 Hz y 112 V, se carga deliberadamente hasta el punto que se detiene a 650 rpm; tiene una resistencia en el rotor de 0.3Ω/fase. Además desarrolla el doble del par a plena carga cuando se arranca con su rotor en cortocircuito; trabaja a una velocidad a plena carga igual a 875 rpm
Calcular:
La velocidad del campo rotante, el deslizamiento crítico (Sb) cuando se detiene y el deslizamiento (S) cuando trabaja a plena carga.
El valor de la reactancia Xlr
La impedancia por fase a rotor bloqueado y la corriente
3.7 Ω
2.7 Ω
1.7 Ω
0.7 Ω
Rt = 3.7 + 0.3 = 4 Ω
Rt = 2.7 + 0.3 = 3 Ω
Rt = 1.7 + 0.3 = 2 Ω
Rt = 0.7 + 0.3 = 1 Ω
Resistencia total del motor
Deslizamiento
Velocidad a plena carga
Corriente
Rr+Rx (Ω)
(rpm)
(Ir)
0,3+3,7=4
0,371
566
27,93
0,3+2,7=3
0,278
650
37,08
0,3+1,7=2
0,185
733,5
56
0,3+0,7=1
0,0926
817
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Enviado por: El remitente no desea revelar su nombre Idioma: castellanoPaís: Ecuador