共查询到16条相似文献，搜索用时 406 毫秒
1.
A novel elevator door driven by tubular permanent magnet linear synchronous motor （TPMLSM） is presented. This TPMLSM applies axial magnet array topology of the secondary rod, air-cored armature windings and slotless structure of the forcer to improve the stability of the thrust. The influence of two major dimensions, the pitch and radius of the permanent magnet （PM）, on magnetic field was studied and the best values were given by the finite element analysis （FEA）. The magnetic field, back EMF and thrust of the motor were analyzed and the PM size was optimized to reduce the harmonic components of the magnetic field and improve the performance of the motor. Predicted results are validated by the experiment. It is shown that the performance of the motor and the novel elevator door system is satisfying. 相似文献
2.
An approach of position sensorless control for permanent magnet synchronous motor （ PMSM ） is put forward based on a sliding mode observer. The mathematical model of PMSM in a stationary αβ reference frame is adopted, and the system is controlled by the digital signal processor （ DSP; TMS320LF2407 according to the control achieve closed loop operation of the motor, the stator theory of sliding mode observer. In order to magnetic field should be vertical with the rotor magnetic field and be synchronous with rotor rotating, so the position and speed of PMSM is estimated in real time and the estimated position is modified continuously. The simulation results indicate that the proposed observer has high precision is more robust to the parametric variation and load in estimation of PMSM position and speed, and torque disturbance. 相似文献
3.
This paper presents an investigation of inverter fault-tolerant operation for a permanent magnet synchronous motor （PMSM） direct torque control （DTC） system under various inverter faults. The performance of a faulty standard 6-switch inverter driven PMSM DTC system is analyzed. To avoid the loss or even disaster caused by the inverter faults, a topology-modified inverter with fault-tolerant capability is introduced, which is reconfigured as a 3-phase 4-switch inverter. The modeling of the 4-switch inverter is then analyzed and a novel DTC strategy with a unique nonlinear perpendicular flux observer and feedback compensation scheme is proposed for obtaining a continuous, disturbance-flee drive system. The simulation and experimental results demonstrate that the proposed inverter fault-tolerant PMSM DTC system is able to operate stably and continuously with acceptable static and pretty good dynamic performance. 相似文献
4.
HUANG Jin KANG Min YANG Jia-qiang 《浙江大学学报(A卷英文版)》2007,8(8):1311-1319
This paper addresses the bearingless motor with a single set of multiphase windings. The interaction between M and M±1 pole-pair magnetic fields produces radial force. Based on this principle,a bearingless machine is obtained. Conventional bearingless machine has dual windings,levitation windings and torque windings,which produce the two magnetic fields. In the proposed bearingless motor,the two needed magnetic fields are produced by feeding two groups of currents to a single set of multiphase windings. Taking a 5-phase induction motor as example,the inductance matrices,considering air gap eccentricity,are calculated with the modified winding function method. The radial force analytical model is deduced by virtual displacement,and its results are validated by FEA. The mathematical model of the new bearingless machine is set up,and the simulation results verified the feasibility of this novel bearingless motor. 相似文献
5.
Oscillations of the spin-polarized conductance controlled by a uniform magnetic field in a modified Aharonov-Bohm ring is studied with use of one-dimensional quantum wave guide.Its expression at zero temperature is obtained as a function of the flux penetrating the ring and the magnetic field.It has been found that there are two kinds of polarized conductance extremas for a given Fermienergy.As Zeemann energy of spin-polarized electron in the stub is varied.one kind of extrema exhibits continuous phase shift .However,another is locked at particular values of phase shift and it can only change abrouptly from a maxima to a minima when Zeemann crosses the level of the bound state of isolated stub.This is a different mehanism for abrupt change phase of conductance osillations. 相似文献
6.
Magnetic Field Analysis of Interior Composite-Rotor Controllable-Flux Permanent Magnet Synchronous Machine 总被引：1，自引：0，他引：1
* A conventional permanent magnet synchronousmachine (PMSM) is built to prevent demagnetizationeven under the extreme operatingconditions in the de-signing phase of rotor magnetic circuit and dimensionof permanent magnets (PMs). The magnet thicknessis large enough to keep the counter magnetic motiveforce (MMF) of armature less than coercive force inhigh temperatures[1]. If a conventional PMSMoperates in a wide speedrange, vector control strategy is always adopted. Bycontrollingd-axis dema… 相似文献
7.
ZHANGXiang－jun CHENBo－shi 《上海大学学报(英文版)》2001,5(1):71-75
A new compensation method and an algorithm for compensating for the commutation torque ripples of the trapezoidal EMF brushless DC motor are put forward.Simulation and experimental results show that this method is correct and practical. 相似文献
8.
9.
With the air gap magnetic field distribution of surface mounted permanent magnet (PM) motors obtained using an analytical technique, the instantaneous electromagnetic torque and its corresponding components are investigated with the Maxwell stress tensor method. Accurate results can easily be achieved using the proposed method without using the tedious finite element analysis (FEA). In this paper, the electromagnetic torque of a surface mounted PM motor with two phases energized is decomposed into four torque components. This technique is useful not only for the design and optimization of the permanent magnet motor, but also for the choice of control strategy. 相似文献
10.
Nonlinear identification of electro-magnetic force model 总被引：1，自引：0，他引：1
Conventional attractive magnetic force models （proportional to the coil current squared and inversely proportional to the gap squared） cannot simulate the nonlinear responses of magnetic bearings in the presence of electromagnetic losses,flux leakage or saturation of iron.In this paper,based on results from an experimental set-up designed to study magnetic force,a novel parametric model is presented in the form of a nonlinear polynomial with unknown coefficients.The parameters of the proposed model are identified using the weighted residual method.Validations of the model identified were performed by comparing the results in time and frequency domains.The results show a good correlation between experiments and numerical simulations. 相似文献
11.
本文研究了电动汽车用的正弦波永磁同步电机（PMSM）模糊控制的仿真分析。分析了永磁同步电机用于矢量控制的数学模型，并建立了基于其数学模型的电机控制仿真软件包。在PMSM双闭环调速系统中，电流环采用滞环电流调节器，速度环采用参数自调整模糊PI控制。通过对传统PI控制和模糊PI控制方法的仿真实验，去验证这种模糊PI控制方法响应快、无超调，与传统PI控制方法相比具有更好的稳定性和抗干扰能力。所开发的电动汽车用的永磁同步电动机驱动系统具有良好的性能，能够很好地满足电动汽车性能要求。 相似文献
12.
在研究永磁同步电动机驱动系统的基础上。建立了永磁同步电动机驱动的电动汽车数学模型，并对拟开发电动汽车进行了计算机仿真，包括电动汽平路稳定转速运行仿真、变车速运行仿真等。仿真结果表明，所开发的永磁同步电动机驱动系统能够很好地满足电动汽车性能要求，永磁同步电动机在电动汽车驱动中具有很大优越性。 相似文献
13.
磁场作用下的磁性流体行波泵研究是行波泵设计的基础。通过分析了行波磁场作用下的磁性流体的运动方程,从而进一步推导了行波磁场作用下的磁性流体的速度方程、旋转速度方程和单位时间内的流量方程,并通过实验进行了验证。研究表明：行波磁场作用下的磁性流体会产生流动现象;行波磁场作用下的磁性流体流量与磁极旋转的角度有直接关系,磁极旋转的角度越大,其流量也越多;行波磁场的强弱对磁性流体流量也会产生影响,磁场越强,其流量越大;行波磁场的频率只能影响磁性流体的流速,对流量不产生任何直接影响。 相似文献
14.
15.
16.
张程 《福建工程学院学报》2011,9(1):61-64
设计了一种采用永磁同步电机驱动、STM32处理器、空间磁场定向控制技术(FOC)和空间电压矢量脉宽调制技术等开发的专用驱动器,实现永磁同步电机的数字化变频调速,实现了无传感器技术在永磁同步电机控制的应用,大大降低了驱动器的成本。 相似文献