A Multi-Tooth Fault-Tolerant Flux-Switching Permanent-Magnet Machine With Twisted-Rotor

A Torque Impulse Balance Control for Multi-Tooth Fault Tolerant Switched-Flux Machines under Open-Circuit Fault

“…Hence, in order to obtain a symmetrical back-EMF without the magnitude reduction, a multi-tooth 6-stator pole, 19-rotor pole fault-tolerant FSPM machine with twisted-rotor (MTFTFSPM-TR) is investigated [12], as shown in Figure 4. As can be seen:…”

“…Based on the above two features, the back-EMF in each is symmetrical without magnitude reduction (the back-EMF superposition factor of the two parts in each coil is cos180 1    ). In conclusion, the advantages of this topology are as follows [12]: (1) The multi-tooth structure can effectively improve the ability to restrain short-circuit currents and maintain a relatively high torque density. Based on the above two features, the back-EMF in each is symmetrical without magnitude reduction (the back-EMF superposition factor of the two parts in each coil is − cos 180 • = 1).…”

“…(4) The FSPM machine can suppress the short-circuit current by increasing self-inductance, whereas the rotor-PM machine needs to increase the leakage inductance to suppress the short-circuit current. Therefore, the SFPM machine can guarantee relatively high torque density while enhancing the ability to suppress the short-circuit [12].…”

“…(3) The SRM operates in half-cycle mode, whereas the FTFSPM operates in whole-cycle mode owing to the PMs, making a relatively high torque density and efficiency. In addition, although with doubly salient structure and concentrated winding, the SFPM machine can provide high sinusoidal PM back-electromotive force (back-EMF) due to the complementary winding structure; thus, this kind of machine is suitable for operation in BLAC mode [11,12].…”

Investigation of Torque Characteristics in a Novel Permanent Magnet Flux Switching Machine With an Outer-Rotor Configuration

“…The recent advances in FEA modelling tools are arguably one of the most important reasons for the revived research interests in the PMFS machine. Meanwhile, PMFS machines with various configurations such as the original [9][10][11][12][13], multi-tooth [14,15], multi-magnet [16][17][18], and hybrid-pole ones [19][20][21], have been proposed for a wide range of applications, from low power and cost-sensitive domestic appliances to large power and high reliability renewable energy devices, and from the automotive markets to the mission-critical aerospace and defence industries.…”