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Application of Permanent Magnet Synchronous Motor (PMSM) has been increasingly popular in Electric Vehicle (EV) area since cost-effective magnetic materials were recently discovered. This paper mainly presents numerical calculation and experimental measurement of core loss of PMSM at various frequencies among 50Hz, 100Hz, 200Hz and 400Hz. A novel design strategy of PMSM will be described. The motor...
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,...
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...
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...
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...
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,...
This paper considers the minimizing of eddy current losses of PM motor through the proper choice of the magnet material, rotor magnet design and the comparison analysis between with and without rotor segmentation. Through 3D analysis and the experiment, it is shown that the magnet segmentation has the effectiveness of eddy current loss reduction especially for the variation of load condition.
This paper addresses trade-off with starting capability to maximize efficiency of a small single-phase line-start permanent magnet motor. In general, as the number of main winding turns is higher, the induced electromotive force is higher. As a result, as the input current is reduced, the copper loss of the stator windings (main and auxiliary windings) is lower. Therefore, the motor efficiency is...
Based on the model of surface mounted permanent magnet synchronous motor, an improved algorithm for off-line parameter identification of motor is presented. In this paper, the single-phase sinusoidal AC signal is injected into the motor which can simulate the single-phase locked-rotor test and the DC signal is injected into the motor in order to simulate the DC test, then filtering the input signal...
An external rotor transverse flux motor has been proposed in our previous research, which has the advantages of low manufacturing cost and high torque density. In this paper, a novel transverse flux is introduced based on the foregoing motor's structure. At first, the detail motor structures and working principle are introduced. Then, the three-dimensional model of proposed motor is built by finite...
This paper presents a novel axial doubly salient electro-magnetic machine with a new double sets of stator structure based on the traditional permanent magnet brushless DC motor and the switched reluctance motor. A new external control circuit is designed according to the special structure and working mechanism of the motor. And according to the electromagnetic characteristics in different conditions...
Recently the multi-objective optimization of Interior Permanent Magnet Synchronous Motor (IPMSM) used for Electrical Vehicles (EVs) has attracted widely attention. However, it not only suffers from its lower optimization efficiency, but also is difficult to achieve the optimal solution. Therefore, an effective multi-objective optimization design scheme is presented which innovatively integrates Taguchi...
This paper proposes a Double-stator Flux Switched permanent magnet motor (DS-FSM) adopting stator-partitioned structure with double air gaps. The DS-FSM is designed and verified by finite element analysis (FEA). Compared with a conventional flux-switching machine using rare earth PMs and a single air gap, the proposed motor demonstrates higher torque density. The designed motors are then comprehensively...
This paper suggests asymmetric stator teeth design to reduce torque ripple and back EMF Total Harmonic Distortion(THD) for Interior Permanent Magnet Synchronous Machine(IPMSM). IPMSM which has 8 poles, 12 slots is analyzed in this study. From changing design parameter in stator structure, 8 comparison models are analyzed. Analysis of proposed method is carried out using Finite Element Method(FEM)...
This paper proposes a simple duty cycle modulated direct torque control (DDTC) for permanent magnet synchronous motors (PMSMs). DDTC sequentially output an active vector and a zero vector during each control period. The duty cycle of active vector is obtained using a duty cycle generator according to the torque error, which can avoid the complex calculation process associated with conventional DDTC...
Torque calculation using the d-q axis has the advantage of faster execution time; however, the torque ripple cannot be considered in torque calculation using the d-q axis equivalent circuit because the time-dependent component is removed. In this work, with d-q transformation, the characteristics of some parameters were identified. These characteristics were considered for representing torque ripple...
In this paper, a new double-sided linear flux-switching permanent magnet (DLFSPM) motor for electromagnetic launch system is proposed, in which the mover only consists of yokeless iron while the permanent magnets and armature windings are all located on the stator. Hence, this motor incorporates the merits of high thrust density of permanent magnet linear motor and high reliability of linear induction...
In this paper, a novel single-phase hybrid switched reluctance motor (HSRM) is proposed for hammer breaker application. The hammer breaker requires only unidirectional rotation and high speed operation without torque dead-zone. To satisfy the requirements, the rotor of the 4/4poles proposed SRM is designed with wider rotor pole arc and non-uniform air-gap is applied on the rotor. This motor has a...
Calculation and matching of the main parameters of a brushless DC (BLDC) motor for a Battery electric vehicle (EV) is studied in this paper. Usually, different shapes of permanent magnet (PM) and different magnetizing methods will affect the performance of the motor. Especially when the motor is designed for an EV, more elements need to be considered, such as efficiency under normal operating conditions...
Overload performance of permanent magnet motor is very important for some special occasions, which has been generally limited by temperature rise of stator. This paper introduces a new method based on heat storage of phase change paraffin to enhance the overload performance of motor. The heat variation of motor was analyzed under overload process, and the key affecting factors were given to control...
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