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With the high power density and the simple structure, complementary and modular linear flux-switching permanent magnet (CMLFSPM) motor is especially suitable for urban rail transit application. A high dynamic performance of the system is significant in transportation system. Compared to the flux-oriented control, the Direct Thrust Control (DTC) method has fast torque response and is scarcely influenced...
Mechanical characteristics analysis of normal and defective transformer windings with eccentric distance under short-circuit (SC) fault are conducted using three-dimensional finite element method (3-D FEM). The change characteristics of maximum stress and displacement of defective windings with different eccentric distances of high voltage winding are obtained. It is found that the increase of the...
Rotor winding interturn short circuit is the main fault of synchronous electric machines, it is of great significance to the safe and stable operation of the machine to discover and handle the fault timely. In view of this, the fault positioning method of rotor turn-to-turn short circuit of synchronous machines was studied. The mathematic expression of exciting magnetomotive force (e-m.m.f.), electromotiveforce...
This paper presents the theoretical analysis of flux-weakening performance of series permanent magnet (SPM) memory machine. A modified circle diagram is proposed to graphically illustrate the maximum torque per voltage (MTPV) flux-weakening control strategy for the memory machine. It is shown that a maximum torque capacity can be obtained by controlling the armature current and magnet flux simultaneously...
In this paper, an improved control strategy (ICS) based on the duty ratio modulation, by properly matching the positive voltage vectors with the new zero voltage vectors (ZVVs), is proposed in direct torque control (DTC) of brushless DC motor (BLDCM). The traditional voltage switching table for the six switches of the converter is modified according to this strategy to minimize the torque ripple....
In this paper, the effect of changes in the width of teeth and yoke on stator temperature characteristics was analyzed. An initial model of fill factor 45% was produced. The validity of the temperature analysis using the thermal equivalent circuit method was experimentally verified. A basic model was selected as the initial model. Also, a temperature characteristic analysis was performed for various...
This paper introduces a submerged LNG (liquefied natural gas) pump cryogenic permanent magnet synchronous motor (PMSM). A 22kW/6000rpm prototype is designed for low temperature operation at −161°C. The influence of temperature on magnetic and electric parameters of materials is analyzed, and a coupled simulation model of electromagnetic-fluid-thermal-stress field is established. On this basis, the...
The thrust and levitation force of the long stator linear synchronous motor (LSLSM) are key points to evaluate the performance of the maglev train. However, it is not easy to be achieved due to the non-linear and dynamic coupling characteristics between thrust and levitation force. In this paper, the finite element analysis model of long stator linear synchronous motor is built for analyzing the thrust...
In this paper, we propose a design model using numerical optimization technique and control technique aiming at improvement of efficiency of the low voltage BLDC motor because the utilization of low voltage motor is increasing for safety and convenience of electric motor use in recent industrial trends. The optimization technique is employed the generalized sensitivity technique and sampling minimization...
Rigid bar and pantographs are used to power electric railway vehicles. When operating an electric railway vehicle, Rigid bar and pantographs are unstable in contact and occurs Arc. It is the cause of breakdown and accident. In this paper, a contact loss simulator for a rigid bar system was designed and the characteristic of arc is analyzed. Especially, occurrence of arc due to the excitation frequency...
The short-time high capacity reactive power output and quick dynamic response performance are two key performances of new large synchronous condenser. In this paper, the effect of load condition on transient response capability of synchronous condenser by finite element analysis (FEa) model. A 300/-150Mvar prototype synchronous condenser is provided for modeling analysis at a group of different steady...
The novel three-phase rotary transformer is an attractive solution to replace the brushes and slip rings of doubly fed induction generators. The interaction of magnetic field produced by primary windings and rotating secondary ones makes it difficult to establish the dynamic mathematical model of the transformer. This paper presents the design procedure and finite element analyses of the novel three-phase...
The stable operation regions are the important issues for direct torque control (DTC) system of permanent magnet synchronous motor (PMSM). The influences of the parameters, such as voltage, current, flux linkage and load angle, on the system operation are investigated through the analysis model presented in this paper. The analysis results show that the parameters must be properly regulated within...
In this study, the fault code of SIBCOS in 8200 series locomotive auxiliary power system was analyzed for the development of the product considering the compatibility with an electric locomotive operated. In addition, the failure code that was frequently displayed when applied to real vehicles was analyzed.
We proposed slim type DC to DC converter modules based on wireless power transmission technology, and 500W class prototype was produced with applying the technology on Switching power supply converter designing. The wireless power transmission technology is actively studied in these days to increase isolated voltage of transformer. The power transmitting transformer was fixed on ceramic centered multi-layer...
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...
In order to control and reduce the electromagnetic vibration of motors, the stresses in motor cores, which are the inherent reasons of vibration, should be computed accurately. Electromagnetic stresses in motor cores are mainly generated from magnetostrictive effect of silicon steel and Maxwell electromagnetic force between the stator and the rotor. So far, stress analysis on motor cores, which is...
When designing a very-high-speed (VHS) machine, it is crucial to evaluate the windage losses accurately, because they are an important part of the total losses. It is therefore important to validate a reliable model, further used for the design and optimization of the motor. In this paper, an empirical windage loss model has been compared to measurements on a motor running up to 155 krpm in a pressure...
A hybrid high temperature superconducting (HTS) linear synchronous propulsion system composed of a HTS linear synchronous motor (HTSLSM) in the middle and HTS magnetic suspension sub-systems on both sides has been proposed for a high-speed maglev train. Four carriages have been made up for the proposed maglev, and each carriage consists of four HTSLSM modules, which weight 45 tons. The maglev train...
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,...
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