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The long primary double sided linear induction motor (DSLIM) with segmented power supply is often used to increase power factor in electromagnetic acceleration applications. Some researchers analyzed the influence of end effect to thrust, but few focused on the thrust fluctuation in the block feeding change process. This paper establishes the mathematical model of DSLIM module and indicates the thrust...
Fundamental frequency estimation is an important task in speech and audio analysis. Harmonic model-based methods typically have superior estimation accuracy. However, such methods usually assume that the fundamental frequency and amplitudes are stationary over a short time frame. In this paper, we propose a Kalman filter-based fundamental frequency estimation algorithm using the harmonic model, where...
Because the numerous nonlinear components and fiber interfaces are used in Module Multiple Converter (MMC), the HIL test of MMC with detailed EMT model and the full-scale interface is hard to be implemented. In recent years, this existing disadvantage caused the MMC controller hardware and software difference between the HIL test and real project. In this paper, a detailed EMT model of hybrid MMC...
High frequency is an effective method to improve transmission efficiency of inductively coupled power transfer (ICPT) system. However, it is hard for the high capacity semiconductor device to meet the high frequency need. In this paper, a novel multiple-frequency inductively power transfer system is proposed. By adopting a novel multiple-frequency topology of inverter, the transfer frequency of the...
This paper investigates single-sided ironless linear synchronous motor (ILSM) based on permanent magnet Halbach array used for medium-speed maglev. Long primary ironless coil is laid along the track and the Halbach permanent magnet array is attached to the bottom of each bogie as a source of traction, two dimensional analytical model of single-sided ILSM is established used to calculate the characteristics...
This paper presents the development of the single side ironless Halbach permanent magnet linear synchronous motor (PMLSM) for a novel electromagnetic suspension (EMS) maglev vehicle. The basic structure of the propulsion motor and the vehicle are firstly described. Then the thrust and normal force of the ironless PMLSM are analyzed. The configuration of the propulsion system and field oriented control...
The long primary double sided linear induction motor (DSLIM) has been used in many fields. The structure of parallel connected DSLIM is similar to multi-asynchronous motor fed by single inverter, but the control method is different due to the DSLIM parameters change. This paper analyses the characteristics of motor module in the operation condition of parallel connection, analyses the thrust fluctuation...
Due to the changed parameters of double sided linear induction motor (DSLIM), the field oriented control (FOC) is not suitable in control and it will result in thrust fluctuation. The thrust control in the DSLIM is a better solution to suppress the thrust fluctuation. This paper establishes the dynamic model of DSLIMs according to the change principle of parameters and uses the model predictive thrust...
Contactless transformer is the key part of the inductive contactless power transfer (ICPT) system. In this paper, a high coupling coefficient contactless transformer is proposed with asymmetric trapezoidal shape cores. With 3D finite element methods (FEM), this paper calculated coupling coefficients of the transformer in different inner lateral side distances and bending angles of the magnetic core...
This paper analyzes the relationship between the load and the efficiency of contactless transformer with multi-pickups which are in series or parallel connection. An optimal load resistance is obtained with parameters of contactless transformer at which the efficiency is the highest. Connection mode of multi-pickups affects the optimal load resistance, which is larger at series but smaller at parallel...
ConiaQi\ess transformer is the key component in inductive power transfer (IPT) system and its coupling coefficient (k) will directly affect the power transfer efficiency. In this paper, a contactless transformer applied in movable vehicle with the structure that primary and secondary sides are asymmetrical is studied. By analyzing the magnetic flux distributions of the transformer, magnetic reluctance...
Contactless transformer is a key part of the inductive contactless power transfer (ICPT) system. In this paper, a contactless transformer is proposed with spoon shape magnetic cores. With 3D finite element methods (FEM), this paper calculates coupling coefficients of the transformer at different inner lateral side distances and end bending angles and extension lengths of the magnetic cores, obtains...
The modeling of speech can be used for speech synthesis and speech recognition. We present a speech analysis method based on pole-zero modeling of speech with mixed block sparse and Gaussian excitation. By using a pole-zero model, instead of the all-pole model, a better spectral fitting can be expected. Moreover, motivated by the block sparse glottal flow excitation during voiced speech and the white...
To transfer large power in inductively coupled power transfer (ICPT) system, parallel secondary pickups are adopted. Because of the error of installation and measure, the parameters of parallel pickup modules are not completely consistent, resulting in the current unbalance or even over- current in parallel modules, which will damage the elements like resonant capacitance, even destabilize the system...
In this paper, we present a speech analysis method based on sparse pole-zero modeling of speech. Instead of using the all-pole model to approximate the speech production filter, a pole-zero model is used for the combined effect of the vocal tract; radiation at the lips and the glottal pulse shape. Moreover, to consider the spiky excitation form of the pulse train during voiced speech, the modeling...
Contactless transformer is the key part of the inductive power transfer (IPT) system that can realize safe electric-energy supply for mobile devices. This paper proposes a novel contactless transformer structure with trapezoidal magnet core, which can be applied to movable vehicle such as high-speed maglev vehicle IPT system. The inductances of primary and secondary windings of different core structures...
This paper introduces long primary double sided linear induction motor (LIM) for special industrial applications. The LIM adopts modular structure and uses block feeding method. The significance is increasing efficiency, saving energy and reducing power capacity, the primary parallel connection with segment powered drive is adopted, which consist of long primary double sided LIMs. Each segment motor...
A new Energy-Storage Slip-Clutch Motor (ESSCM) was proposed for transient high-power and large torque driving. In this paper, motors of different inner rotor structures and materials are compared with respect to the value of starting torque and starting time. Two structures of distributed composite rotor and interval composite rotor are analyzed. Motors of different slot types are also studied based...
A segment control scheme of inductive power transfer (IPT) system for rail transit is proposed in this paper. In this scheme, the power supply range of primary coils along the track is segmented into several intervals and the several sets of pickups are installed aboard. When the vehicle runs, the switching frequency and the reference current of inverters is modulated with the position of the pickup...
The grating type velocity measuring method shows great promise in getting the velocity of high power and large thrust linear motors. In this paper, the analytical model of velocity measuring sensor is deduced, and verified through experiment. The analytical model of electromagnetic field produced by “8”word rectangular planar spiral coils is obtained from the second order vector potential formulation...
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