Abstract
In this paper, an axial field switched-flux permanent magnet (AFSFPM) machine with stator-PM, which has a high power/torque density and efficiency feature as well as shorter axial length, is designed, analyzed and controlled. The topology, operating principle and design procedure of the AFSFPM machine are labored and discussed. The electromagnetic performance, including the flux linkage, back-EMF, cogging torque, winding inductance and field-control capability, are studied based on 3-D finite-element analysis (FEA). In order to investigate the operating performance of the machine in the whole speed range, a continuous-control-set model predictive control (MPC) method for the AFSFPM machine is proposed. Based on the stage control targets, the maximum torque per ampere (MTPA) and maximum output power flux-weakening strategies are presented in constant torque and constant power regions, respectively. Finally, a prototype of AFSFPM machine has been manufactured and experimentally evaluated and the results show that the MTPA strategy increases the load capability and the flux-weakening strategy broadens the constant power operation range. Moreover, the anti-load-disturbance capacity and dynamic response performance are improved under the MPC method. As a result, the proposed AFSFPM machine drive system is excellent alternative for electrical vehicles (EVs) or hybrid EVs (HEVs).
Highlights
The axial flux permanent magnet (AFPM) machines have attracted a huge amount of attention from the researchers and industry because of some magnetic and geometric structure merits compared to the radial PM machine, which are very interesting for the electrical vehicles (EVs) and wind power applications [1,2,3,4,5,6,7]
Axial field switched-flux permanent magnet (AFSFPM) machine combines the characteristics of the AFPM and SFPM machine, which exhibits some merits of shorter axial length, robust rotor structure, high power/torque density and efficiency, convenient heat-dissipation and flexible control
This paper investigated a three-phase 12/10 AFSFPM machine with dual-stator-single-rotor structure including optimization design, analysis and control, which is interesting for EV/hybrid EVs (HEVs)
Summary
The axial flux permanent magnet (AFPM) machines have attracted a huge amount of attention from the researchers and industry because of some magnetic and geometric structure merits compared to the radial PM machine, which are very interesting for the electrical vehicles (EVs) and wind power applications [1,2,3,4,5,6,7]. The switched-flux permanent magnet (SFPM) machine with stator-PM, are being considered and under extensive investigation due to simple structure, robust rotor, high power/torque density, as well as sinusoidal electromotive force (EMF) [8,9,10,11,12,13,14,15]. Axial field switched-flux permanent magnet (AFSFPM) machine combines the characteristics of the AFPM and SFPM machine, which exhibits some merits of shorter axial length, robust rotor structure, high power/torque density and efficiency, convenient heat-dissipation and flexible control. Different from our previous works [34,35], which focused on machine design for different applications such as EVs or direct-drive wind power system, the contributions of this paper are to investigate the operating performance of AFSFPM machine drive system in the entire speed operating region with emphasis on control strategies, which can offer effective torque and speed control.
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