Aiming at the problems of unstable structure, oversized and low productivity of C-stator, and low slot fullness and torque density of U-stator and E-stator in the disk transverse flux motor for high-torque and low -speed, a new multi-layer winding disk transverse flux motor topology with windings wound at both ends of the U-stator is proposed. The structure and principle of the motor are introduced, and a reluctance-based motor 3-D equivalent magnetic network model established. The relations between the no-load flux linkage, back-EMF and the main dimensions are calculated and derived for the main magnetic flux considering the spatial leakage of the permanent magnets. The superiority and effectiveness of the proposed motor structure is analyzed through a comparative study with the 3D finite element results of cogging torque, torque density and power factor of a double-wound disk transverse flux motor. A prototype machine is piloted and tested for the back-EMF, and the accuracy of the modeling and analysis method is verified by comparing the results of simulation and experiment.

When finite control set model predictive control (FCS-MPC) is applied in the flux-weakening control of permanent magnet synchronous machine (PMSM) , the system suffers from poor parameter robustness. To solve this problem, a proportional-integral-derivative (PID) -type cost function of FCS-MPC in the flux-weakening control of PMSM is proposed. In the proposed strategy, the PID-type cost function consists of three components: the proportional error cost of tracking the current, the integral error cost of weakening the steady-state control error, and the differential error cost of reducing the ripple error. The prediction model is established by the mathematical model of PMSM, and the implementation process of FCS-MPC with PID-type cost function in the flux-weakening control of PMSM is described in detail. Meanwhile, the delay compensation strategy is applied to the system to ensure the accuracy of the prediction. The simulation results prove that when the parameters of the PMSM are mismatched in the flux-weakening control, the FCS-MPC base on the PID-type cost function can not only improve the robustness of the control system to motor parameters and load torque perturbations, but also retain the good dynamic performance of FCS-MPC.