In this study, we investigate the machine parameters and the torque of interior permanent magnet motors by considering dq-axis interference caused by magnetic saturation of rotor cores. First, the total flux in the motor is decomposed into those produced by armature currents and permanent magnets by using finite element method. Then, the torque is decomposed into four components by using the machine parameters involving the effect of dq-axis interference. The validity of the calculated results is confirmed by experiments. The effect of the dq-axis interfrence on the torque is clarified. Finally, an appropriate magnet configuration is discussed in order to reduce the effect of dq-axis interference.
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