: 54 56 () Consider a 2 poles, three phase permanent-magnet synchronous motor. The stator inductance is L= 0.085 H and the stator resistance can be assumed to be zero. The permanent magnets induce the rated voltage of 380 Volt at the rotational speed 1000 r/m and rated current is 1.7 Ampere (a) if the control principle is = 0 is used and the motor is operated at the rated voltage and current Calculate: Orotational speed torque mechanical power. (b) if the motor is driven in the field-weakening region at the rated voltage and current. The speed is increased until the absolute values of is and i, are equal at the rated voltage and current Calculate: Orotational speed Otorque mechanical power. Case (b) rotational speed n=1684.02 rpm a Case (a) torque T=41.36 Nm Case (a) rotational speed n=997.62 rpm Case (a) torque T= 15.44 Nm Case (a) mechanical power P= 1.11 kw Case (b) torque T= 10.92 Nm . : 54 56 () Consider a 2 poles, three phase permanent-magnet synchronous motor. The stator inductance is L= 0.085 H and the stator resistance can be assumed to be zero. The permanent magnets induce the rated voltage of 380 Volt at the rotational speed 1000 r/m and rated current is 1.7 Ampere (a) if the control principle is = 0 is used and the motor is operated at the rated voltage and current Calculate: Orotational speed torque mechanical power. (b) if the motor is driven in the field-weakening region at the rated voltage and current. The speed is increased until the absolute values of is and i, are equal at the rated voltage and current Calculate: Orotational speed Otorque mechanical power. Case (b) rotational speed n=1684.02 rpm a Case (a) torque T=41.36 Nm Case (a) rotational speed n=997.62 rpm Case (a) torque T= 15.44 Nm Case (a) mechanical power P= 1.11 kw Case (b) torque T= 10.92 Nm