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1.
介绍了舰载雷达波导转换开关(简称波导开关)的功能,特点和步进电机的原理,特性,推导了步进电机直接驱动波导开关负载的计算公式,提供了选择电机和校核电机的参考依据。  相似文献   

2.
郭咏  朱华  刘军  赵淳生 《压电与声光》2019,41(4):524-528
为提升旋转行波超声电机输出性能,研究其在不同负载下的最优预压力,针对TRUM-70H超声电机进行了理论计算和实验验证。建立超声电机动力学模型,分析了预压力对超声电机机械特性的影响;以TRUM-70H超声电机为对象,分析其最优预压力与负载力矩间的关系;搭建超声电机多功能测试平台,验证理论推导结果,并指出误差存在的原因;根据研究结论,提出超声电机装配时应根据负载选用预压力。结果表明,预压力和负载力矩对超声电机转速的影响存在耦合关系;在超声电机有效工作范围内,最优预压力值与负载力矩近似呈线性正相关;装配时根据实际负载需求设定超声电机预压力,可提高其输出效率。  相似文献   

3.
基于扭纵复合型超声电机动力学模型的模拟计算   总被引:4,自引:0,他引:4  
基于动力学原理,利用一种新的扭纵复合型超声电动机的动力学模型,模拟计算了扭纵复合型超声电动机的转速、转矩、效率和响应时间等特性。计算结果揭示了预压力、定子两路振动振幅等输入参数对负载特性的影响。此外,转子运转的响应时间与负载力矩间的关系也可由模拟计算导出。利用该模型对所研制的复合型超声电机实验样机进行的计算结果与实际测量结果基本相符,验证了该模型及相应数值计算方法的可靠性。利用该模型首次计算出定,转子接触与分离点的不对称特性。  相似文献   

4.
同时带有整流负载和交流负载的同步发电机分析方法研究   总被引:1,自引:0,他引:1  
黄建  蔡孟夏 《电力电子》2005,3(1):41-47,52
为了分析整流所带来的谐波的影响,对同时带整流和交流负载的同步发电机进行了仿真和实测。对不同负载比例下的交流负载上的电流和电机的相电压进行了比较和谐波分析,计算了谐波损耗。仿真、实测和理论分析的结果表明:整流负载比例较大时,电枢电压和交流侧电流中的谐波含量也比较大,谐波电枢反应将影响电机的性能。特别是在计算电机的损耗时,需要对谐波损耗单独加以考虑。  相似文献   

5.
何思模 《电力电子》2004,2(4):i016-i016
他在分析了我国变频器发展历史的基础上,对目前变频器参数大量使用的情况对电机用户造成的选择困难的原因做了深入的探讨。变频器作为一种特殊的电源,主要是为了适应电机的需要,即变频器与相应的传动电机相配合,得到理想的、适合于负载的驱动特性,同时变频器作为连接电机与电源的装置应该成为消除电网干扰源形成绿色电源的中坚。它上要对电网负  相似文献   

6.
推导出永磁同步电动机的定子侧绕组的电压约束方程式,建立三绕组永磁同步电动机在d-q-0坐标系下的动态数学模型,对电机的起动瞬态特性进行分析;运用对称分量法分析三相永磁同步电动机的电路系统,计算起动和运行时需要的电容值;根据牵入同步判据,计算不同负载下所能牵入同步的最大转动惯量。通过实例对三绕组永磁同步电动机牵动负载的起动过程进行仿真分析,结果表明在单相电源供电系统下,可以选择合适的电容值使其起动和运行。  相似文献   

7.
负载变化对设计二端口网络传输特性的影响   总被引:1,自引:0,他引:1  
该文研究负载变化对设计二端口网络传输特性的影响,定义网络传输特性随负载变化不灵敏的二端口网络为最小失配网络。利用蒙特.卡罗方法设计了一个5阶最小失配滤波器网络,设计的最小失配滤波器传输特性在负载电阻变化时,其传输特性优于原型滤波器。计算结果证明在合理选择技术指标条件下,最小失配网络存在并可以实现。  相似文献   

8.
一种简单实用的超声电机频率跟踪控制技术   总被引:6,自引:1,他引:5  
超声电机的速度及负载驱动特性是与定子的谐振特性及激励频率密切相关的。在电机工作过程中.温升会使谐振特性发生变化。为了保持电机性能的稳定,激励频率必须跟踪谐振特性的变化。该文首先从定子的导纳曲线漂移的角度来描述电机谐振状态的变化,然后通过检测某相电压与电流的相位差来实现频率跟踪控制,最后用实验验证了这种方法的有效性。  相似文献   

9.
PowerFlex7000变频器在中压变频器实验站的应用   总被引:1,自引:0,他引:1  
罗克韦尔PowerFlex7000变频器在九洲中压变频实验站测试系统中作为变流逆变器使用,由于其本身属于电流源型变频器,具有四象限运行功能,能够实现能量的回馈和对电机的制动,先进的矢量控制技术,可以实现各种复杂多变的负载特性,在模拟电机负载方面起到了其他变频器无法替代的作用,实现了变频器出厂之前的满负荷测试。  相似文献   

10.
基于西门子Sinamics S120的电机负载特性测试系统设计   总被引:2,自引:0,他引:2  
周鹏  王英 《变频器世界》2011,(3):104-106
本文介绍了以西门子S7-300PLC作为控制器,以Sinamics S120变频器作为加载装置的电机负载特性测试系统。详细叙述了系统的设计思路及软硬件结构。该测试系统能够实现电机负载特性的自动化测试,提高了测试效率。  相似文献   

11.
金刚石  王斯 《激光与红外》2019,49(8):974-977
提出了一种光电搜索跟踪系统中电机性能的校核方法,这种方法是将电机工作区域与负载工作区域叠加,利用两区域的包含关系来判断电机是否满足负载的使用要求。该方法弥补了传统的电机性能校核方法的不足——当负载运行到某些极端情况时,可能导致电机无法达到技术要求的问题。该方法应用简单,并且较传统的电机性能校核方法更完善、更可靠。  相似文献   

12.
Modern mechatronic applications often involve complex motions, resulting in highly dynamic motor loads. The selection of an appropriate motor is based on the characteristics of the load, besides other technical, as well as economic, considerations. However, motor characteristics, such as rotor inertia, affect the motor load, which complicates the analysis. The selection criterion presented in this paper separates the motor characteristics from the load characteristics and its graphical representation facilitates the feasibility check of a certain drive and the comparison between different systems. In addition, it yields the range of possible transmission ratios. The method is illustrated with an industrial case study  相似文献   

13.
本试验方案是为解决异步电动机在对拖时,由于陪伺电机的加载而产生反噬能量所设计。本设计采用了转速控制模式和转矩控制模式两种试验方法。在对拖电机同步转动的情况下,分别进行转速、转矩两种控制模式下的加载试验,通过基于Visual Basic的电机测试系统采集试验数据并生成数据图形进行分析。由试验结果可得转矩、转速两种控制模式加载下,主电机的机械能转化效率可分别达到85%和89%,表明该设计方案相比以往解决方案具有更高的效率和实用性。  相似文献   

14.
通过对三相交流异步电动机能耗的简单阐述,以及对其负载、输入电压电流、最小电流与转差率之间的关系的深入分析,讲述了一种基于单片机的电动机自动负载跟踪节电控制装置的基本控制原理和实现方法,不仅实现节电的目的,同时也延长了电动机的使用寿命。  相似文献   

15.
针对目前测量电机效率需要先停机、进行负载分离以便进行空载试验、堵转实验、测试成本较高、对生产影响大、不能提供实时数据的特点,提出了一种异步电机效率测量的新方法.不需进行空载试验、堵转实验,能在不停机的情况下进行效率的测量。该方法使用一种测量仪器在线测量定子功率因数,使用变频器获取电机运行效率模型参数,求得电机效率,  相似文献   

16.
This paper presents an application of induction motor mechanical speed and load torque observers in high-speed train drives. The observers are applied for a 1.2-MW electric drive with an induction motor. The goal of using such observers is to utilize computed variables for diagnostic purposes of speed sensors and torque transmission system. The concept of diagnostic system is presented in this paper, and proper criteria are proposed. The suggested system is designed to work without a speed sensor in the case of existing sensor faults. Monitored motor load torque is used to limit the maximum motor torque in the case of existing problems in the gearbox. The results of simulation and experimental investigations for a 1.2-MW induction motor drive are presented.   相似文献   

17.
DC motors are used indispensably in industrial applications because they provide such advantages as small size, high speed, low construction cost, and safe operation. A major area of research in DC motors is to determine a better method to measure the torque of motor shaft. The traditional way to measure the mechanical torque of a rotating shaft is attachment a torque transducer in the transmission system between the driving motor and the load. However, this technique requires additional parts for the transmission system, which makes the design more complicated, time consuming, costly in construction, and in many cases impossible to achieve.The purpose of this paper is to present a new method for estimating the load torque of a DC motor shaft by using a novel modelling method based on an adaptive control technique, named as online tuning grey fuzzy PID (OTGFPID). A test rig using a DC motor is setup to investigate the torque behaviour as well as to evaluate the developed estimator. Firstly, mathematical model is developed for the motor. Secondly, the experimental speed-torque data and the optimized motor model is used to optimize the torque estimator. Then the optimized estimator is used to estimate accurately the load torque. Finally, the capability of the optimized torque estimator has been validated with the practical experiments in comparison with a typical estimation method.  相似文献   

18.
Damping a hybrid stepping motor with estimated position and velocity   总被引:1,自引:0,他引:1  
It is well known that microstepping reduces the resonance behavior of stepping motors since the rotor moves in a sequence of very small steps. However, the under-damped nature of the motor does not change. In this paper, a scheme that uses microstepping and closed loop position control to stabilize and reduce resonance damping of the motor is proposed. The motor currents are controlled in a frame rotating synchronously with the excitation frequency. The d-axis current provides the torque to oppose the external load, and the q-axis current provides the transient torque to damp the motor. The motor velocity and position are estimated via an observer that tracks the angle of the motor back EMF voltage. The response of the closed loop system is independent of the external load level. Both simulation and experimental results have shown that the proposed control scheme is very effective in damping out the resonance of microstepping-controlled motors.  相似文献   

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