Abstract
A novel dual air-gap transverse-flux six-phase permanent magnet electric machine using C-shaped configured architecture with laminated silicon steel is designed and implemented in this study. The magnetic flux density distribution and magnetic flux linkage of the C-shaped configured architecture with laminated silicon steel have been achieved to verify the design concept which leading the magnetic line in the same direction as laminated silicon steel arrangement. The notches on both stators and rotors are designed aiming at lowering down cogging torque and compared with a normal permanent magnet electric machine. The optimal combination is resulted in the cogging torque reduction of 70.2%, and the output torque reduction is 6.5%. Additionally, a new model-free predictive current control, insensitive to parameter variations of the electric machines, is proposed to drive the permanent magnet electric machine aiming at six-phase current error reduction within 0.36 A. As a result, a better satisfactory current tracking ability of the proposed model-free predictive current control law in the six-phase permanent magnet electric machine has been validated successfully in experimental results.
Highlights
Permanent magnet electric machines (PMEMs) are widely applied in high-performance motor drive applications due to desirable advantages of higher torque density and efficiency, so they have been applied in highlevel servo drives, electric vehicles, medical assist devices, and so on
Various notched structures on both the stators and the rotors can be obtained by adopting finite element analysis (FEA) electromagnetic simulation through modifying magnetic flux distribution of pole faces across air-gap to reduce the cogging torque
A prototype of dual air-gap transverse-flux sixphase permanent magnet electric machines (PMEMs) using C-shaped slots with laminated silicon steel and various notches on both stator teeth (ST) and permanent magnets (PMs) has been fabricated to achieve the goal of low cogging torque
Summary
Permanent magnet electric machines (PMEMs) are widely applied in high-performance motor drive applications due to desirable advantages of higher torque density and efficiency, so they have been applied in highlevel servo drives, electric vehicles, medical assist devices, and so on. This article presents a novel dual airgap transverse-flux six-phase PMEM with the C-shaped laminated slots and low cogging torque. Notches on both the stators and the rotors are designed to accomplish the target of cogging torque reduction. Various notched structures on both the stators and the rotors can be obtained by adopting finite element analysis (FEA) electromagnetic simulation through modifying magnetic flux distribution of pole faces across air-gap to reduce the cogging torque. The dual air-gap transverse-flux six-phase PMEM consists of dual air-gaps in axial sides, 24 C-shaped laminated slots in a stator, and 20-poles in a PM rotor. Every three-phase angle is differed from 120° in electrical angle, that is, A, B, C,
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