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Electric model based in the duality between the electric and magnetic circuit taking into account the misalignment characteristic of transformer of a Wireless Power Transfer, WPT, is proposed. Being a model based in the constructive characteristic of the transformer the model, it represents better the misalignment effect and the simulation values are more accurate in comparison with the T model that...
In this paper, control system and simulation of an arc-linear permanent-magnet synchronous machine with normal armature windings and compensation windings are researched. Considering the special structure of the machine, the mathematical model of the machine is investigated and established. The control scheme and the control system for the machine are also researched to reduce the torque ripple for...
Due to the advantage of power transmission over certain distance without using wires, the wireless power transfer system has attracted more and more attention. This paper proposes an analytic approach to investigate the transfer efficiency of magnetically-coupled inductive wireless power transfer system with constant power load. The mathematical model of the wireless power transfer system with constant...
The position and speed detection of maglev train is critical to train control system. The common methods of speed measurement include speed sensor measurement and speed sensorless measurement. The use of sensorless method can significantly reduce costs and it's not influenced by various environmental factors. In this paper, a high frequency pulsating voltage injection method is proposed for the PMLSM,...
This paper presents a robustness-improving discrete-time current controller utilizing predictive current control (PCC) for permanent magnet linear synchronous motor (PMLSM). The stability and robustness of the PCC system is highly affected by the parameters mismatch between the controller and the plant, and the inherent digital control delay can limit the bandwidth. Toward this, an integrated method...
In order to meet the selectivity and the speed requirement of DC protections, this paper proposes a new DC protection scheme for DC substation systems. This scheme is developed based on the single-ended natural variation characteristics of DC current and its first and second derivatives under fault transients. It extracts the transient characteristic difference between the internal fault and external...
In order to reduce the torque ripple and improve the torque-speed characteristic of switched reluctance motor, a novel predictive current control method is proposed in this paper. Compared with conventional current hysteresis control, the current tracing ability is improved by using proposed method without increasing switch frequency or changing hysteresis band. Both of torque ripples and copper loss...
Most of magnetic encoder ICs are on-axis, and they are generally suitable for inner rotor PMSM, sometimes used in external rotor PMSM. However, in some special occasions, these ICs are not used for the difficulty of mounting, for example, there is an external rotor PMSM with a hollow shaft, which is convenient for passing the control wire. It is difficult to mount these encoder ICs, because there...
Recently, redundancy permanent magnet synchronous motor (PMSM) is widely applied in aviation. To improve the reliability of redundancy PMSM, the short-circuit current should be restrained via anti-short-circuit design. For the further optimization design of redundancy PMSM, it is essential to research the influence of anti-short-circuit design on the PMSM performance. Therefore, in this paper, two...
Model predictive control is a kind of control method based on parameter model. However, in the actual system, the parameters of the motor may deviate from the parameters in the model due to the influence of various objective factors, leading to deterioration of the control performance. In this paper, a strong parameters robustness model predictive current control (MPCC) method for permanent-magnet...
In-wheel motor system is recognized as the ideal drive system for electric vehicles. To reduce mechanical shock and electromagnetic impulsion brought by rigid connection between hubs and motor, our group proposed a novel permanent bistable electromagnetic clutch which flexibly connecting the motor and hubs. In this paper, several power supply schemes for the clutch are proposed and compared, then,...
Synchronous reluctance machine (SynRM) has attracted much attention thanks to the advantages such as low cost, rugged rotor structure and high efficiency. Conventional drive for the SynRM is the same as that for permanent magnet synchronous machine (PMSM), i.e., the sine-wave drive. In this paper, square-wave drive is proposed for the SynRM. The torque performances with square-wave drive are analyzed...
Interior permanent magnet synchronous motor (IPMSM) has stronger reluctance torque and mechanical strength and better dynamic performance, being highly suitable for high-speed operation. Practically, the performance of IPMSM is dramatically influenced by various rotor structures. This paper studies a fractional-slot IPMSM and it is analyzed that how those parameters, such as the number of permanent...
This paper presents a novel harmonic current injection method to optimize air-gap flux density distribution for multiphase induction machine. The control objective is to generate a nearly rectangular air-gap flux for better iron utilization. The proposed method uses air-gap field-oriented control and rotor field-oriented control to realize a real-time adjustment of the third harmonic current under...
This paper discusses the main circuit topology and control method of current source controller(CSC) for a three-phase induction motor. In the circuit, the three phase AC power supply is taken as the input part of CSC, which is rectified into three phase controlled rectifier. In DC circuit, the DC bus inductor is utilized to store energy and filters harmonic so that the circuit is shown as the current...
In this paper, a phase shifted full bridge (PSFB) dc-dc converter with secondary synchronous rectifier is implemented using GaN HEMT. The design considerations including PCB layout, optimal dead time for efficiency are described, and prototype hardware is implemented based on analysis results. The experiment is carried out with a 500W prototype, and power efficiency is compared with a conventional...
This paper presents an improved analytical model for estimating the high-frequency current ripple of interior permanent magnet (IPM) synchronous machines due to PWM switching. The proposed model accounts for the impact of slotting effects, magnetic saturation, and cross-coupling between the d- and q-axes. The model is subsequently used to investigate several factors that influence the PWM-induced...
This paper introduces nonlinear modeling of a new dual rotor machine named dual-rotor permanent magnet reluctance (DRPMR) machine. The paper proposes the varying magnetic network model of DRPMR machine considering possible saturation and nonlinearity according to its novel structure. The final results are verified by the finite element method (FEM) and results prove the validity of the proposed model.
In this paper, a new current control approach applied in linear synchronous motor (LSM) drive system is proposed for traction-system. The proposed method is featured by adjusting the current proportions of paralleled converters in double-end supply. First, the theoretical model of LSM of double-end supply is established and the control strategy consists of an outer PI speed closed-loop, an inner current...
A novel linear actuator for a tactile display is proposed, especially for Braille aimed for visually impaired people, and also for a new human haptics interface. The features of actuators for this use may be evaluated by output force, stroke, compactness, and so on. The proposed new actuator has better performance in terms of stroke, compactness, and output force compared with existing actuators....
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