HELP! What's Wrong with My Motor Test

I have a project of studying a small induction motor, the motor is of 250W output power, 220V delta connection, 50Hz, rated speed 2780rpm, synchronous speed 3000rpm, 2 poles and when the motor runs at 2780rpm, the rated current as measured is 0.477A

The stator resistance is 36.885ohm

I have made a no-load test and a rotor-blocked test to the motor. From the no-load test, the voltage is 220V and phase current is 0.223A and phase power is 7.2W. Thus I can briefly estimate the magnetising reactance and core resistance.

In the rotor-blocked test, voltage is 40V, phase current 0.474A which is close to current rating, and phase power is 14.5W. In this case I can work out the resistance of rotor referred to stator and the sum of stator and rotor reactance. For estimation, I made stator reactance=0.4 x total reactance calculated in rotor-blocked test.

Seems all good then.

The result is as follows,

stator reactance=21.12

stator resistance=36.885

core resistance=6666.67

magnetising reactance=995.48

rotor reactance=31.68

rotor resistance=27.65

I built the equivalent circuit, and set slip to be 0.073 at normal operation.

Here comes the problem. With the equivalent circuit I am able to calculate the input impedance and the apply a voltage of 220V across the circuit. Then current=V/Zin should be the rated current as the motor runs at rated speed. But the current calculated is 0.72A, no way near the rated 0.477A.

I have been troubled by this for a long time...