Ronghai Qu's research while affiliated with Huazhong University of Science and Technology and other places

... Compared with indirect electrical model-based methods and the computationally intensive Finite Element Method (FEM) or Computational Fluid Dynamics (CFD) approaches, the loworder LPTN offers several key advantages, including the absence of signal injection, reduced computational burden and flexibility by its equivalent node features [11]. In [12]- [14], various LPTN designs based on different motor types and material properties have been proposed, where heat transfer and losses are typically derived based on detailed motor geometry and material data. To reduce the modeling efforts and the need Hybrid Thermal Modeling with LPTN-Informed Neural Network for Multi-Node Temperature Estimation in PMSM for extensive expert knowledge, low-order LPTN models employing global parameter identification have been developed in [15]- [17]. ...

... It is well known that the control range can be augmented by injecting a third harmonic in the PWM signals or using a space-vector modulator [23], [24], [25], [26], [27], [28], [29]. This technique is an open topic in hysteresis controller design. ...

... Our methodology tackles the challenge of accurate speed control in EVs during demanding road conditions, particularly uphill climbs and downhill descents. Traditionally, control methods have overlooked the complexities of terrain, neglecting their impact on speed control precision and energy consumption Wang et al., 2023a). To address this, our study integrates real-time road gradient data into the EV control system, enabling adaptive speed control that adjusts to the road's slope. ...

... In [11], the toroidal winding is proposed, which can effectively improve the pitch factor to improve machine performance. In [12,13], auxiliary teeth are added to reduce magnetic leakage and increase torque. ...

... Owing to the reduced flux leakage, the torque density was greatly improved. A novel asymmetric CPFRPM machine with "Fe/N/Fe-N-Fe/N/Fe" structure was proposed in [25]. The electromagnetic performances of the novel asymmetric CPFRPM machine were compared with the CPFRPM machine and the asymmetric-stator-pole FRPM machine. ...

... PMSM drives have unique advan-tages of a high power-to-weight ratio, excellent dynamics, high torque, and a wide range of operating conditions. However, in the aforementioned applications, they are exposed to mechanical and thermal stresses under variant operations, leading to demagnetization and intern-short circuit faults (ITSC) [2]. In contrast to uniform demagnetization, which reduces all the magnets by the same ratio, local demagnetization occurs in a limited area of rotor poles, resulting in a magnetic asymmetry. ...

... Furthermore, an integrated control method is proposed to suppress distorted currents, aiming to achieve low total harmonic distortion of the current in open-end winding PMSM drive systems. Moreover, the research in [53] introduces a novel phase current reconstruction strategy tailored for the post-fault operation of a five-leg dual-inverter driven open-winding PMSM. ...

... Halbach arrays can create a strong magnetic field [14] due to their inherent capability to generate a one-sided magnetic field [15]. The Halbach array CMG (HAL-CMG) drive has a higher torque density, superior dynamical response under load and good self-shielding magnetization [16][17][18][19]. However, these drives insert further parameters in the optimization process, making the problem of increasing the torque density computationally intensive. ...

... AGA-GAN uses attribute guided attention modules (AGA modules) in an attribute stream of features parallel to a main stream of features to bridge the information gap between the high and LR images. Mean square error (MSE)based super-resolution methods frequently yield over smoothed outputs and may lose some texture features (Cheng et al., 2017;Sun et al., 2023). In contrast, GAN-based super-resolution approaches may cause adverse distortions to face recognition. ...

... Magnetic gears (MGs) are emerging as superior alternatives to traditional mechanical gearboxes, offering a host of benefits that include higher efficiency, reduced noise, and intrinsic self-protection features [3][4][5]. These advantages stem from MGs' ability to inherently provide overload protection through the physical separation of input and output rotors, a critical feature that significantly enhances transmission reliability [6]. ...