A new consequent-pole permanent magnet (CPM) machine with segmented structure/unequal teeth (CPM-SU machine) is proposed in this article. The segmented structure is adopted to decrease the torque ripple. To improve the torque density, the structure of unequal teeth is used in this proposed machine. The five-phase winding located in the stator is composed of three fractional-slot concentrated windings (FSCWs), which are helpful to improve the fault-tolerant capability. Permanent magnets (PMs) are placed in the rotor. To decrease the PM cost, V-type PMs and iron cores are arranged with the sequence of S-iron-S-N-iron-N. The magnetic field generated by PMs is investigated, which is helpful to demonstrate the working mechanism of this proposed CPM-SU machine. To verify the superiority of the proposed CPM-SU machine, a conventional CPM machine with unsegmented structure/equal teeth (CPM-UE machine) is proposed. The electromagnetic properties of these two machines, including the electromagnetic torque, the cogging torque, and the back electromotive force (back EMF), are analyzed by the finite element (FE) method. The simulating results show that the CPM-SU machine can exhibit excellent performances, such as low torque ripple and high torque density.

In this paper, a five-phase V-type hybrid-excited permanent magnet (FV-HEPM) machine with unequal teeth is introduced for high torque density and wide flux regulating range, which can be applied in some wide speed-range applications such as electric vehicles (EVs) and hybrid electric vehicles (HEVs). The consequent pole is adopted in the rotor, in which the interior PM is designed as the V-type to improve rigidity and flux density. The stator teeth are divided into the main teeth and the auxiliary teeth to achieve parallel magnetic circuit for the inhibition of demagnetization. DC-excitation windings and armature windings are employed on the stator for better space utilization. Through graphical analysis, the operating principle and topology of this machine are discussed. Afterward, six models with different PM shapes are analyzed and compared by the finite-element (FE) method. A multi-objective optimization method is adopted to optimize the PM size for better electromagnetic performances. The results prove that FV-HEPM machine has not only the excellent torque output capability but also the wide flux regulating ability.

In this paper, a new three-segment dual-stator permanent magnet (TSDSPM) machine applied in electric vehicles (EVs) is proposed and analyzed. This machine keeps many characteristics, such as the brushless hybrid excitation, the torque-boost ability, the flux-regulating ability and the high space utilization. The topology and the operating mechanism of this proposed machine are illustrated by several analytical models. The outer stator of this machine consists of three segments. The inner stator is placed in the consequent-pole rotor. The V-type internal permanent magnets (PMs) are housed inside the rotor. Two sets of windings are adopted in the double stators. Therefore, the torque density is improved and the flux-regulating ability is achieved. The design methodology is discussed in this machine. Several key structural parameters of the rotor and the stator, such as the split ratio, the aspect ratio, the PM pole arc, the PM angle and the asymmetric air-gap length, are analyzed. Next, an optimization method is proposed to shorten the design cycle. The electromagnetic models before and after optimization are established. Then, several electromagnetic properties of this machine are analyzed by the finite element method (FEM). In addition, a prototype machine is manufactured and tested to validate the simulation results.

In this paper, a new consequent-pole segmented dual-stator permanent magnet (CPSDSPM) machine, which is used for some high-torque & low-speed applications, is proposed. This proposed machine adopts two stators, in which the external stator is segmented into three parts. The intermediate rotor is sandwiched between the internal stator and the external stator. Due to a particular coupling effect between the internal stator and the external stator, the CPSDSPM machine can inherently exhibit excellent flux-enhancing ability and output capability. The configuration of this proposed machine is introduced. The working mechanism especially the coupling effect is discussed by analytical models. The electromagnetic properties, such as the no-load back electromotive force (back-EMF), the cogging torque, the output capability and the torque ripple, are all calculated and analyzed by the finite element (FE) method. It can be seen that the simulating results can verify the correctness of the theoretical analysis and the superiority of the proposed CPSDSPM machine. A prototype machine is fabricated and tested to validate the results of the FE analysis.

In this article, a new consequent-pole hybrid excited machine with drum winding (CPHE-DW machine) is proposed for electric vehicles (EVs). The stator tooth, which is divided into the armature and excitation tooth, is designed as the consequent-tooth structure to construct two individual flux paths. The dimension of the armature tooth is slightly larger than the excitation tooth. The drum winding is placed in the stator, which can be regarded as both the armature and excitation winding. Accordingly, the current input into the drum winding can be divided into the ac and dc components, in which the air-gap flux is regulated by the dc component. The U-type permanent magnets (PMs) are housed in the consequent-pole rotor with the sequence of PM-iron-PM-iron. Owing to the consequent-pole and consequent-tooth structure, a particular electromagnetic coupling effect can be achieved. The operating principle of the electromagnetic coupling effect is studied by several analytical models. The main flux paths of this proposed machine are introduced. Several main electromagnetic properties are predicted by the finite element (FE) method. Finally, a prototype of the CPHE-DW machine is manufactured to validate the correctness of the FE predictions and the analytical analysis.