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The numerical technique for parameters estimation is applicable for the induction machine (IM) with arbitrary number of stator phases and arbitrary number of rotor bars. The self‐inductance and mutual inductance matrices for the stator side and rotor side are constructed through the magnetic vector potential method. The Clarke transformation is implemented to separate the magnetising inductance and slot leakage inductance of each sequence plane, where the orthogonality theory of trigonometric function is used. The harmonic leakage inductance of each plane is calculated based on the ratios of the harmonic components among air‐gap flux density. The 2D eddy current field solver is conducted to obtain the rotor resistance based on the IM equivalent circuit. A classical mathematical model is established using the acquired parameters under Simulink environment to accomplish the comparisons between the simulated and experimental performance. The non‐sinusoidal power supply based on the rotor field‐orientated control, which is highly dependent on the precision of parameters, is carried out under no‐load and heavy load conditions to indirectly verify the accuracy of parameters.

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This paper focuses on the loss estimation for the multiphase induction machine (IM) operating under fault-tolerant conditions through the field–circuit coupling finite element method (FEM). Both one-phase and two-phase open-circuit faults of a seven-phase IM are researched, and different spatial positions of the fault phases are taken into consideration. The magnitudes and phase angles of the residual phase’s current are deduced based on the principle of equal magnitude of the residual phase currents and unchanged fundamental magnetic motive force (MMF). The magnetic fields’ coupling between the fundamental and harmonic planes is analyzed. Then, the time-stepping electromagnetic fields calculation of the seven-phase IM are carried out under the commercial software Simplorer–Maxwell environment. The transient and steady performance for both the health and fault conditions are obtained based on the rotor field-oriented control (RFOC) strategy. The Joule loss and iron loss are calculated for the torque step and slope responses. The seven-phase motor driving platform is established to verify the numerical calculation results. The proposed method is effective for predicting the loss and designing a reasonable operating range for multiphase IM operating under fault-tolerant conditions considering the thermal balance.

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