Abstract: Consequent pole (CP) permanent magnet (PM) machines, i.e., PMs with the same or different polarity are replaced by salient pole iron core, which can improve the utilization of PM material while ensuring high torque density. However, its air-gap flux density is asymmetry. Hence, the cogging torque model of CP PM machine was established under asymmetry air-gap flux density. The relationship between the magnetic field harmonics and the cogging torque was illustrated, and the influence of air-gap flux density even-order harmonics on cogging torque with different pole slots was revealed. The influences of air-gap flux density even-order harmonics on back-EMF and electromagnetic torque ripple were studied. Based on the winding theory, the influences of slot and pole combinations on back-EMF even-order harmonics and torque ripple were investigated. The CP PM machine was manufactured and the theoretical analysis was verified by experiments.