This paper presents parameter identification of an induction machine for integrated starter alternator (ISA) operating in variable frequency and variable excitation conditions. No-load and stand-still tests are conducted at various frequencies instead of single rated frequency in order to obtain the variation of rotor resistance, rotor leakage inductance and magnetizing inductance with frequency. The variation of magnetizing inductance with the magnetizing current is also investigated by conducting no-load test at various terminal voltages. The parameters obtained from above tests are compared with conventional no-load and stand-still parameters as well as parameters obtained from on-line monitoring methods, namely impressed stator voltage and impressed stator current tests. The results of these tests allow an intensive investigation of parameter variation of the induction machine (ISA) under variable frequency and excitation conditions.