Transverse flux machines (TFMs) can achieve high force density by the reducing the pole pitch because of the decoupling of electric and magnetic loadings. But the main flux linkage interlinking with the armature coils will decrease as the pole pitch reducing, resulting in motor performance degradation. Unlike the approaches adopted by many literatures to suppress the leakage flux, this paper proposes a novel dual-consequent-pole transverse flux linear machine by adopting dual-PM structure. Without increasing the occupied volume, the coil flux linkage is enhanced and the force density can be further improved. At first, the basic configuration and operation principle are introduced at first. Then the leading parameter influence on the force density are investigated. The electromagnetic performance of the proposed machine is investigated by three-dimensional finite element analysis and is compared with its counterparts. The field distribution, winding flux linkage, back EMF, detent force and thrust force are emphasized as well as the efficiency and power factor. Finally, a prototype machine is constructed and tested to validate the theoretical analysis.

In this paper, a novel dual-consequent-pole transverse flux motor and its analytical model are proposed. Differ from existed transverse flux machines, the proposed motor owns core-tooth-to-magnet types of consequent-pole configuration on both stator and rotor. This unique motor configuration improves the no-load permanent magnet flux linkage interlinking with armature winding, thus leading to an enhanced torque density. The structure and working principle of the proposed motor are introduced as the first half part. Then, based on the combination of equivalent magnetic circuit method and subdomain method, an analytical modeling method is proposed to estimate the electromagnetic performance of the proposed motor. The parameters of the equivalent magnetic circuit model, e.g., the magnetomotive forces and reluctances are calculated based on subdomain model technique, considering the influence of the cores' saturation and the axial end effect during calculation. Based on the magnetic field distribution result, the electromagnetic performance is estimated. The analytical results are verified by both finite element method and prototype experiment.

Model-free predictive current control (MFPCC) completely separates from the motor model, and only needs to read the current variations in the lookup tables to predict future currents, thus having strong parameter robustness. However, the stagnation of current variations is a core issue that needs to be addressed in existing MFPCCs. Therefore, this article proposes a more effective MFPCC strategy of permanent magnet synchronous motor. First, an advanced strategy is proposed to estimate current variations using a variant of the ultralocal model, where the local variables in the model are provided in real-time by sliding mode observer. This method can easily extract the current variations corresponding to all voltage vectors from the measured current variations caused by the voltage vectors applied in the previous period. Secondly, an anti-stagnation mechanism with higher reliability and better performance was designed. This mechanism effectively improves prediction accuracy by utilizing a pair of antiphase vectors and corresponding current variations, avoiding update stagnation. Since non-optimal vectors are not forced to be applied, this anti-stagnation mechanism has no impact on control performance. Finally, through comparative experiments on multiple predictive current control schemes, it is demonstrated that the proposed MFPCC has improved both steady-state and dynamic performance.

Transverse flux motors are of great interest in the low-speed high-torque direct-drive applications. In this paper, a novel transverse-flux flux-reversal motor structure is presented, which is more suitable than conventional transverse-flux motors when cost and torque density are both considered. The basic structure and operating principle are introduced. The three-dimensional (3-D) equivalent magnetic circuit model is established to obtain the expression of electromagnetic torque. A 3-D finite element model is built to analyze the influence of structure parameters on the torque density. A prototype is designed and manufactured based on the analysis result of finite element method (FEM), the experiments of no-load back-electromotive force and load torque are carried out. The experimental results agree with the results of FEM, which verifies the accuracy of FEM analysis.

In this paper, a dual-consequent-pole transverse flux motor and its electromagnetic design method are proposed. Both stator and rotor of the proposed motor are designed to own the consequent-pole configurations. The unique motor structure improves the space utilization and the torque density. Firstly, the detailed structure and principle are introduced, and the development of the torque density of the proposed motor is discussed. Secondly, the electromagnetic design method's theory, considerations and flow process are listed. Then, the selections of some main structure parameters are proposed, e.g. pole-pitch, thickness of PMs and pole-arc coefficients of PMs. The electromagnetic performances of proposed motor are compared with the existed transverse flux machines. At last, a prototype is manufactured and some primary experiments are done to verify and evaluate the proposed motor topology.

In this paper, two FCS-MPC strategies based on deadbeat control are proposed for the five-level OW-PMSM drive at the DC-link voltage ratio of 3:1. The space vector diagram of the OW-PMSM drive is divided into 16 subsectors in each sector and the specific subsector is selected according to the reference voltage vector obtained from deadbeat control. In this way, the traversal calculation burden can be greatly relieved with only 2 or 3 candidate vectors. Besides, in view of different optimization objectives, namely high power quality and low switching frequency, the MPC candidate vector selection of five-level vector distribution is designed based on whether the virtual vectors are considered. Finally, the effectiveness and superiority of the proposed FCS-MPC strategies for five-level OW-PMSM drives are verified through experimental comparisons.