Xiaofeng Zhu's research while affiliated with Nanjing Normal University and other places

... In Ref. [38], the technique of dq-axis current injection is implemented in a five-phase PMSM drive system. The topology of the five-phase PMSM drive system with one or two switch failures is shown in Fig. 12. ...

Reference:

Review of Fault-Tolerant Control for Motor Inverter Failure with Operational Quality Considered

... With the merits of high torque density and high efficiency, permanent magnet (PM) machines have been extensively investigated and widely applied in many industry fields, such as in electrical vehicles, wind power generations, and traction systems [1][2][3][4]. According to the different placements of PMs, PM machines can be divided into rotor-PM [5] and stator-PM [6,7] machines. As a special topology of stator-PM machines, flux-switching permanent magnet (FSPM) machines have attracted much attention because of their characteristics such as good heat dissipation, high rotor robustness, easy manufacturing, and highly sinusoidal back-EMF waveform [8][9][10]. ...

Reference:

Investigation of the Torque Production Mechanism of Dual-Stator Axial-Field Flux-Switching Permanent Magnet Motors

... In particular, although nonsinusoidal back-EMF may be obtained with other types of windings, it is especially easy to produce in PMSMs with concentrated windings (containing large winding-function harmonics). These windings also offer several attractive features when using fractional slot perpole-per-phase number that make them powerful candidates for electric vehicles [31], [32], despite their typically low (negligible) saliency ratio [2], [33], [34]. They exhibit high slot fill factor and power density [32], [35], low manufacturing cost [28], [29], [35] and cogging torque [35], [36], short end windings [28], [31], [35], [37], better filtering of undesired current harmonics [8], enhanced isolation between windings and tolerance to short-circuit faults [2], [34], [37], etc. ...

Reference:

Open-Phase-Tolerant Online Current References for Maximum Torque Range and Minimum Loss With Current and Torque-Ripple Limits for n -Phase Nonsalient PMSMs With Nonsinusoidal Back EMF

... Based on the result-to-reason prospect, the torque disturbance can be extracted from the speed ripple with the corresponding component, which is independent of the motor electrical model. The ILC method is generally used to track the repetitive or periodic system with a fixed period by iterating the previous signal, which is in parallel with the proportional-integral (PI) speed controller to generate the current reference [18], [19]. However, the fundamental is the main component of the load torque for single rolling rotor compressor, which can be obtained first to enhance the iteration effect. ...

Reference:

Zero-Pole Cancellation Based Iterative Learning Control Method for Speed Ripple Suppression of Single Rolling Rotor Compressor

... The cogging torque of the CP-PM motor is investigated in ref. [22] which has twice the period of the traditional PM motor. Existing measures to reduce cogging torque in permanent magnet motors mainly include [23][24][25][26] skewed armature slots, auxiliary slots, changing armature tooth shape, optimise rotor parameters, such as skewed poles, adjusting pole arc coefficient, and non-uniform pole arc combinations. In ref. [24], a rotor structure with two segments and the intersection angle between two magnets of one Vshaped pole is different from the others. ...

Reference:

Design and analysis of a less‐magnets consequent‐pole line‐start permanent magnet motor with low cogging torque

... The general consensus of existing literature is that the cogging torque of FSPM machines is relatively large due to the unique double salient structure and high air-gap flux density, as shown in Fig. 1(b)-(d). As a consequence, FSPM machines exhibit higher torque ripple than traditional PM machines, which degrades control performance and causes erratic operation [14], [15]. ...

Reference:

Comprehensive Investigation and Evaluation of Cogging Torque Suppression Techniques of Flux-Switching Permanent Magnet Machines

... Inverse cosine rotor flange shaping, eccentric circular, multi-step shaping techniques are suggested for variable flux reluctance machines [12]. The shifting rotor teeth with two different designs and stepped skewing rotor parts are recommended for cogging torque diminution of FSPMs [13]. Rotor pole teeth optimization is explored in [14] for electrically supplied FSPMs. ...

Reference:

The Effects of the Unequal Rotor Slot Arc on Cogging Torque for Flux Switching Permanent Magnet Machines

... Changing the rotor tooth width causes the mean torque variation and torque ripple. Optimum choice of the rotor tooth width causes the induced voltage harmonics reduction [53]. Figure 29 shows the impact of the rotor tooth width in the FSM with different number of poles upon the torque ripple. ...

Reference:

Performance Enhancement of Flux Switching Motor for Electric Vehicle Applications: An Overview

... According to the design experience of FRM, the slot fill factor of the conventional slot machine and the curved slot machine is set to 0.4 [15]. Under the condition that only the parameters of the stator slot change, curved slot machines have a higher average torque after finite element analysis. ...

Reference:

Analysis and Optimization of a Wavy Rotor FRM with Curved Stator Slots

... Extended-range EVs (ER-EVs) [58] Similar to BEVs, ER-EVs have large batteries for electric driving. Additionally, they are equipped with a supplementary combustion engine that charges the batteries when needed. ...

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Predicting the Production and Depletion of Rare Earth Elements and Their Influence on Energy Sector Sustainability through the Utilization of Multilevel Linear Prediction Mixed-Effects Models with R Software