Method of measuring unsaturated inductances of an equivalent circuit of a synchronous machine

A method of measuring unsaturated inductances of an equivalent circuit of a synchronous machine comprising:

• measuring an armature resistance of a synchronous machine;
• measuring a time constant of an armature with damper under a quadrature-axis magnetomotive force produced by flowing current to an armature coil of the synchronous machine when an armature and a field are in a positional relationship;
• measuring a current and a voltage of the armature when the armature and the field are in said positional relationship by a quadrature-axis Dalton-Cameron method;
• solving calculating equations concerning a quadrature-axis equivalent circuit of the synchronous machine by using results of the measuring the armature resistance, the measuring the time constant of the armature with damper under the quadrature-axis magnetomotive force and the measuring by the quadrature-axis Dalton-Cameron method, thereby obtaining inductances of respective elements constituting the quadrature-axis equivalent circuit.