This study aimed to design an active disturbance rejection control (ADRC) with parameter identification for current control in permanent magnet synchronous motor (PMSM) servo systems. Given the nonlinear uncertainty of the PMSMs, a parameter identification method based on the consensus Kalman filter was designed to establish an approximate model of the motor, reduce the uncertainty of the current loop model, and utilize the improved ADRC algorithm to eliminate the influence of uncertainty, nonlinearity, and strong coupling of the current loop of the PMSM. Consequently, the current control precision of the inner loop improved. The control experiment results indicate that the proposed method is suitable for the current control of nonlinear and strongly-coupled servo systems.INDEX TERMS Consensus extended Kalman filter, permanent magnet synchronous motor, parameter identification, active disturbance rejection control (ADRC) current control, servo system.

In this paper, based on the conventional flux-switching permanent magnet (PM) (FSPM) machine, a novel dual-three-phase dual-rotor FSPM machine with PMs of NS layout (NS-DRFSPM) is proposed. The stator of the proposed NS-DRFSPM machine is equipped with dual PMs and dual armature windings to operate in a variety of operating modes and to handle the case of PMs or armature windings failure. Firstly, the topological structure and eight fault operating states of the NS-DRFSPM machine are introduced, and the key design parameters of the NS-DRFSPM machine are optimized by genetic algorithm (GA) optimization and finite element analysis (FEA). Then, the operation principle of the NS-DRFSPM machine is analyzed in detail. Finally, the finite element method is used to analyze the performances of the NS-DRFSPM machine under eight fault operating states, which is mainly analyzed from two aspects: no-load performance and torque performance. The results show that the NS-DRFSPM machine has good electromagnetic performance under different fault conditions, including large back-electromotive force (EMF) amplitude, sinusoidal EMF waveform, high average torque, small torque ripple, and strong anti-saturation ability.

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In this paper, based on the conventional nonoverlapping stator wound field synchronous (N-SWFS) machine, a novel multi-excitation-tooth N-SWFS (MN-SWFS) machine is firstly proposed by changing winding configurations and the excitation-teeth shape. The electromagnetic performance of four optimized MN-SWFS machines sharing the same 12-stator-teeth but different rotor-teeth numbers, namely 12/10, 12/11, 12/13, and 12/14, is compared by finite element analysis (FEA). The corresponding simulation results show that 12/10 and 12/14 are the optimal stator-teeth/rotor-teeth combinations due to much smaller back electromotive force (back-EMF) THD and torque ripple (Trip). Finally, a series of comparative studies are carried out on the proposed MN-SWFS machines and the conventional N-SWFS machines. The comparative results validate that the proposed 12/10 and 12/14 MN-SWFS machines exhibit better electromagnetic performance than the conventional 12/11 and 12/13 N-SWFS machines, such as higher fundamental back-EMF amplitude and greater torque output capability, though their cogging torque (Tcog) and torque ripple are slightly higher, and the torque anti-saturation ability is slightly weaker.