电动机旋转磁场的定量分析

本文简单介绍了电动机磁场的几种分析方法及其优缺点,重点介绍了有限元法及其改进,并用有限元法计算了磁场参数感应电动势和电磁转矩。     

基于模糊神经网络直接转矩控制系统设计

针对传统的直接转矩控制中存在转矩、定子磁链波动大的问题,提出了一种结合空间矢量调制的模糊神经网络直接转矩控制方法。该方法运用模糊神经网络得到期望的任意相位空间电压矢量,再结合空间矢量调制直接对逆变器的开关状态进行控制,以达到减小转矩、定子磁链波动的目的。最后以TMS320F240为核心搭建了直接转矩控制系统,通过采集实验数据分析结果表明,直接转矩控制系统与传统的直接转矩控制系统相比,磁链和转矩波动明显减少,并且保持了转矩和速度的响应速度。     

摆线减速器的故障维修实例

通过摆线减速器故障的仔细分析,排除轴材质强度不够的因素,最终确定扭矩传递失灵,迅速进行科学检修,确保刮泥机的平稳运行。     

Application of direct torque control to electric screw presses for speeding up torque response and reducing starting current

Fast response and stable torque output are crucial to the performance of electric screw presses. This paper describes the design of a direct torque control （DTC） system for speeding up torque response and reducing the starting current of electric screw presses and its application to the J58K series of numerical control electric screw presses with a dual-motor drive. The DTC drive system encompasses speed control, torque reference control, and switching frequency control. Comparison of the DTC dual-AC induction motor drive with corresponding AC servo motor drive showed that for the J58K-315 electric screw press, the DTC drive system attains a higher maximum speed （786 r/min） within a shorter time （1.13 s） during a 250 nun stroke and undergoes smaller rise in temperature （42.0 ℃） in the motor after running for 2 h at a 12 min-1 strike frequency than the AC servo motor drive does （751 r/min within 1.19 s, and 50.6 ℃ rise）. Moreover, the DTC AC induction motor drive, with no need for a tachometer or position encoder to feed back the speed or position of the motor shaft, enjoys increased reliability in a strong-shock work environment.     

基于直接转矩控制的异步电机调速系统的研究

针对PWM逆变器供电驱动的异步电机直接转矩控制变频调速系统的特点,在Matlab环境下,利用Simulink/Power System,采用结构化和模块化的方法,对异步电机变频调速系统进行了建模和仿真,并详细介绍了各子模块的构造方法及功能。构建的仿真模型与实际变频调速系统比较接近,为高性能的异步电机变频调速控制系统地设计与调试提供了一种较好的检验手段,且实现简单,便于修改。仿真结果验证了建模方法的有效性。     

长距离胶带机的分阶段起动

胶带机的起动方式，严重影响着设备的质量及安全。章结合生产实际，提出了解决长距离胶带机的起动方式。     

Influence of PWM Modes on Commutation Torque Ripples in Sensorless Brushless DC Motor Control System

This paper introduces four PWM modes used in the sensorless brushless DC motor control system,analyzes their different influences on the commutation torque ripple in detail,and selects the best PWM mode in four given types to reduce commutation torque ripple of Brushless OC( BLDC) motors,Simulation and experimental results show that the selection is correct and practical.     

表面磁钢永磁无刷电机电磁转矩的解析法分析

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.     

基于ZJ型传感器的转矩转速测量仪研制

介绍了一种基于ZJ型传感器的转矩转速测量仪的设计。该测量仪采用了单片机技术，因此能对信号进行快速采样、及时分析、精确显示。     

智能化电机转矩、转速测试仪的研制

介绍一种利用单片机技术研制的智能化电机转矩、转速测试仪,其具有测量电机转矩、转速、过载、超速报警、串行通信等功能,硬件结构简单、测量精度高、速度快、运行可靠,为生产电机厂家比较理想的测试仪器.