A Dual Consequent-pole Split-tooth Vernier Machine with Enhanced Modulation Effect

This paper investigates several split tooth vernier machines (STVM) with different magnet arrangements. For all the STVMs, uneven flux modulation teeth structure is applied to achieve higher back-EMF and torque density based on multi-working-harmonic theory. The dual flux modulation effect is considered and analyzed for the STVMs with consequent-pole rotors and stator magnets. Key parameters including the distribution of flux modulation teeth and pole arc of rotor magnets are studied and optimized for the comparable models. At last, a new dual-consequent-pole split-tooth vernier machine with multiple working harmonics is proposed. The proposed machine has 45% higher torque density and 27% higher power factor than the regular split-tooth vernier machines, which is due to the optimized distribution of flux modulation teeth and the dual flux modulation effect.