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This paper proposes a non-symmetrical permanent-magnet linear motor traction system (PMLMTS), in which the primary permanent-magnet linear motor (PMLM) is employed. Four movers are mounted with same phase angles. There are nine legs, including eight independent legs and one common leg. All legs have same normal voltage but different normal currents. The normal current of the common leg is four times...
This paper presents a model predictive power control (MPPC) scheme for the brushless doubly fed twin stator induction generator (BDFTSIG). State-space equations of the BDFTSIG, in terms of power winding (PW) current, control winding (CW) current, and PW flux, is specifically derived. A complete power model, which clearly reveals the relationship between power and the applied voltage vector, is then...
In this paper, the significant influence of rotor-poles number on the electromagnetic performances of the novel rotor-permanent magnet flux-switching (RPM-FS) machine is investigated. The operation principles of the RPM-FS machines with 10-, 11-, 13- and 14-rotor-poles are analyzed from the generator and motor-driving perspectives, respectively, and the armature reaction field and PM field modulation...
Due to the sparsity that contained in underwater acoustic (UWA) channels, in recent years tremendous attention has been drawn in designing sparse channel estimation algorithms for improve the performance of channel equalizer, which is driven by channel estimator. However, experimental evaluation and comparison is limited regarding enhancing the performance of different norm constraint sparse channel...
In this paper, a novel technique to design a band-notched UWB antenna by using Barium Strontium Titante (BST) is proposed. A printed slot UWB antenna with size of 16 mm× 27 mm is adopted as a basic antenna. A piece of cylindrical BST slab with 1 mm height and 2.4 mm diameter is attached on the feeding layer of the antenna to achieve band-notched characteristics. The simulated −10 dB bandwidth of the...
In this paper, we proposed a novel mobile phone antenna with yttrium iron garnet (YIG) ferrite slab loaded to enhance antenna bandwidth. The antenna has an inverted-L shaped slot etched on the ground plane. The slot is fed by means of a 50 Ω microstrip connected to a bent strip. A step-shaped YIG ferrite slab is attached on the ground plane in the slot region to enhance bandwidth. The measured −6...
This paper investigates the thermal performance of a three-phase 10kW flux-switching permanent magnet (FSPM) machine used as an integrated starter generator (ISG) for hybrid electric vehicles, where the temperature rise experiments are conducted under different operating conditions. Also, the thermal analysis of the FSPM machine is simplified into one-dimensional steady heat conduction with two heat...
In this paper, comparisons between two permanent-magnet-free (PM-free) machines, namely a wound-field flux-switching machine (WFFSM) and a switched reluctance machine (SRM), covering skewed-rotor and straight-rotor structures are conducted. The topologies and operation principles of the WFFSM are illustrated firstly. Then, the effects of rotor skewing angle on static characteristics, e.g., open-circuit...
To enhance the control precision of permanent magnet synchronous motor (PMSM) under parameter variations and load torque disturbances, a minimal reduced-order load torque observer (MRLTO) based discrete-time sliding mode control (DSMC) scheme is presented. First, a DSMC controller is presented on the basis of the second-order discrete-time PMSM dynamics model to enhance the speed tracking response...
According to the hierarchical control system of sintering production process, a multi-layer performance assessment method is proposed. We discuss the structure, function and technology used of multi-layer performance assessment strategy which is composed of sintering comprehensive coke ratio (CCR) assessment module, sintering ignition assessment module and fuzzy synthetic decision-making module. The...
To diagnose the specific reasons that lead to deterioration of controller performance and improve the diagnostic accuracy, a performance diagnosis method based on eigenvector subspace K-mean clustering is proposed. Firstly, the number of standard deterioration performance subspace with different degrees of deterioration information is increased on the basis of the eigenvector subspace distance diagnosis...
Feature selection is a crucial step in the development of a system for identifying emotions in speech. How to select high correlation features is an open question. This paper focuses on feature selection method which aims to extract the most effective acoustic features to improve the performance of emotion recognition. Emotional feature selection of speaker-independent speech based on Random Forest...
In this paper, a polarization beam splitter (PBS) based on the indium phosphide (InP) platform is presented. The main advantage of the device is that the tight fabrication tolerances of fully passive devices can be overcome by adjusting two voltages in an easy calibration. To produce the splitting function, the Pockels effect and the plasma dispersion effect are exploited in the phase shifters of...
A novel modular-spoke-type permanent magnet (MSTPM) machine is proposed in this paper. Firstly, the geometric topology and operating principle of MSTPM machine are briefly introduced. Then, the permanent-magnet magneto-motive-force (PM-MMF) and no-load radial air-gap flux density in a pair of MSTPM machine and conventional surface-mounted permanent magnet (SPM) machine are compared. Further, the even-order...
An ultra-wideband antenna with band-notch for 5.8 GHz WLAN is proposed. The antenna is composed of two slots called the main slot and the sub-slot. The main slot has a hybrid shape of a rectangle connected to a half circle. The sub-slot has a rectangular shape. The two slots are fed by a bent shaped strip. The antenna has a compact size of 18 mm − 22 mm. The measured −10 dB frequency band of the proposed...
In this paper, a double space vector modulation (SVM) based direct torque control (DTC) scheme is proposed for the T type NPC (T-NPC) inverter fed dual three-phase PMSM drives. The proposed scheme provides a solution for high-power and high-reliability motor drives. It inherits the advantages of fast dynamic performance of DTC and good harmonic performance of SVM. Compared to previous vector space...
Motor reliability research has received extensive attention and the bearing is one of components with the highest failure rates in the machine. The shaft voltage is one of the main causes of bearing failure. In this paper, the inherent shaft voltage of flux-switching permanent magnet (FSPM) machine is analyzed which associated with motor structure of Stator-PM machine. The inherent shaft voltage analysis...
In this paper, a new concept for the application of linear flux-switching permanent magnet (LFSPM) machine to ropeless elevator is proposed. The single-sided LFSPM machine with complementary and modular structure is investigated as a candidate. Moreover, the secondary stator is made of mild steel. The normal upward and downward characteristics of the linear machine are analyzed by the three-dimensional...
A novel slot antenna is proposed for mobile phone applications. The antenna has two slots named Slotl and Slot2, respectively. Slot1 has a hybrid shape of the combination of a circle and a rectangle with four steps located at the lower edge of the rectangle. Slot2 is of rectangular shape. The two slots are opened at opposite edges of the system board. The antenna is fed with a folded shaped 50 Ω microstrip...
This paper presents the split ratio optimization technique of the magnetic-gear dual-rotor motor (MGDRM). The split ratio of a MGDRM, which relates the stator inner diameter to the total motor diameter, can be optimized with the goal of generating maximum torque for a given motor volume. A new complementary structure is used to reduce the torque ripple. Combining with this new design techniques, a...
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