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# Mathcad - 07-08 - Rs:= 0.063 Prated:= 100 hp Xs:= 0.506...

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Z rotor 1.764 0.759i + = the rotor resistance is divided by the slip, so Z rotor R r s j X r + = s 2.778% = 100% s n s n rated - n s = n s 1800 rev min = b. This is a 4-pole motor with synchronous speed of 1800 rpm, so at rated speed, the slip is given by obviously the power factor is nearly zero in this case arg I NL ( 29 89.777 - deg = I NL 16.388A = I NL 0.064 16.388i - A = I NL V LN Z NL = Z NL 0.063 16.206i + = Z NL Z stator Z m + = Z m j X m = Z stator R s j X s + = at synchronous speed, the slip is zero, which makes the rotor an open circuit. Thus, the stator impedance is in series with the magnetizing reactance V LN 265.581V = V LN V LL 3 = a. The equivalent circuit uses a line to neutral voltage so: V LL

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Mathcad - 07-08 - Rs:= 0.063 Prated:= 100 hp Xs:= 0.506...

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