轴向柱塞式液压马达转矩特性的理论研究

研究了轴向柱塞液压马达的转矩特性及其配流盘闭死角对转矩特性的影响，首次推导了对称配流盘有闭死角的柱塞马达瞬时转矩、平均转矩和理论排量公式，通过进一步分析得到了关于海水柱塞马达瞬时转矩的一有益结论，对海水液压马达的设计具有重要意义。     

叶片式气动马达转速响应特性分析

以一种典型的气动执行元件叶片式气动马达为研究对象,建立了马达的运动学模型,对马达在不同气源压力下的输出转速进行了仿真,通过其输出速度曲线的动态特性参数,分析了马达转速响应特性,为该类马达的结构优化设计奠定了基础。     

叶片式气动马达轴向间隙的优化设计

轴向间隙影响着叶片式气动马达的容积效率和机械效率。本文利用优化设计原理确定叶片式气动马达的最优轴向间隙。     

气动齿轮马达的理论流量计算与实验研究

由于气动齿轮马达有许多优点,在工程中广泛应用。文中根据齿轮式气动马达的结构和工作原理,按照流体力学的方法,计算了气动齿轮马达的理论耗气量,最后对一种锚杆钻机使用的气动齿轮马达进行了参数计算,并通过实验进行了验证。     

用陀螺理论求解液压锥差马达动力学方程

根据液压锥差马达机构特点,进行机构的受力分析,运用陀螺理论即刚体定点转动理论,建立液压锥差马达的欧拉动力学方程,推导出马达输入油压与输出转速的理论解析式,并作较深入的讨论,总结出该型马达的工作特性,为该型马达的设计提供了可靠依据。     

活塞式气动马达的动力特性分析

简要介绍活塞式气动马达的结构原理,利用能量守恒原理,推导出转速与负荷的计算公式。以本公司使用的发动机为例,通过计算,绘制出气动马达的动力特性n-M曲线。     

基于谐波传动技术的气动步进马达设计研究

通过结合谐波齿轮传动设计理论,研究了新型流体波发生器,并在此基础上设计研究了一种可以实现数字控制、低速、大转矩的气动步进马达。并对新型气动步进马达的设计方法、控制方式和运动特性等关键技术进行了系统的试验和理论研究,获得了一些有实用价值的成果。     

气动齿轮马达静态特性的理论与实验研究

根据流体力学和气压传动原理,分析齿轮式气动马达的结构和特点,以力矩平衡的方法建立了气动式齿轮马达静态特性的数学模型,对一种用于锚杆钻机的气动式齿轮马达进行了理论计算,并和实验数据进行了比较,为齿轮式气动马达的优化奠定了理论基础。     

气动马达的工作特性

流体马达,无论是液体抑或气体的,都具有共同的优点——单位重量具有高的转矩和功率,在特殊或有危险性的场合下也能安全操作。然而,气动马达比液压马达具有更优越的性能:具有良好密封的马达长期运转而不会发热,同时,负载一旦减少到适应马达的转矩能力时,气动马达即恢复正常运转;其次,供气管道敷设价廉(管道气压为100～200磅/时~2,即7～14公斤/厘米~2),维修比液压管道要少;再者,从气路连接和轴端密封处的泄出物清洁,而液压泄漏往往会引起压力下降、易燃、损坏装饰表面及弄     

泵／马达试验台转矩转速传感器安装方法分析

转矩转速传感器很容易被较大的径向力损坏,本文提出了液压泵／马达试验台转矩转速传感器安装轴承座的三种设计方案,推导了各方案的受力计算式,比较其安装特点,以到达保护传感器、提高试验效率的目的。     

Force and energetic characteristics of a spiral air motor

It is examined whether it is possible to use a spiral volumetric device as an air motor. A mathematical model of a spiral air motor making it possible to calculate its power, torque, and energetic performance is obtained. It is shown that the spiral air motor has better specific characteristics than other types of rotary driving air motors.     

Electrical and structural design of air-conditioning fan motor for noise reduction

AC induction motors have been widely used for fan motor of the air conditioner indoor unit. Noise of these AC induction motors is usually caused by the coupling effects of structural and electrical systems. The rotating torque and the noise from AC induction motor were discussed in this paper,. First, the modification of motor was carried out in order to reduce the unbalance magnetomotive force between main and sub winding. Second, structural modification based on normal mode analysis and modal testing was carried out so that the fan motor does not have the natural frequencies near the 2f-line frequency. Numerical modifications through these two processes were verified by experiments, which showed that the sound pressure level at 2f-line frequency of the modified system became about 25dB less than that of conventional one.     

Development of nutation motors (improvement of pneumatic nutation motor by optimizing diaphragm design)

This article describes the improvement of a pneumatic nutation motor. Pneumatic nutation motors that are driven by diaphragm are expected to have bigger torque. In this report, refined design of the diaphragm is discussed. First, several different shapes of diaphragms are proposed and analyzed with nonlinear FEM. Second, a “bellows type” diaphragm is fabricated and built in the motor. Holding fixture for the diaphragm is also refined to improve its performance. Finally, torques of the new model and conventional model are compared, resulting in that the new model generates the torque 20 percent higher than that of the conventional model at any air pressure.     

电液负载模拟器同步结构解耦研究

针对电液负载模拟器中的多余力矩问题,以阀控摆动马达电液负载模拟器为对象,在分析研究多余力矩产生机理及影响因素的基础上,提出一种同步结构解耦新方法,具体实现是将加载执行元件设计成复式双层结构,外层同步马达用于跟踪承载对象进行位置同步控制,内层马达用于加载,通过复式结构加载执行元件实现变被动加载为主动加载,从根本上解决了多余力矩问题。给出了复式摆动马达的参数匹配原则、密封及结构设计方案,仿真分析了内外层马达油道配流方式的合理性。最后,通过小梯度加载下电液负载模拟器性能的仿真分析验证了同步结构解耦新方法的正确性及有效性。     

Principle and experimental verification of novel dual driving face rotary ultrasonic motor

Existing rotary ultrasonic motors operating in extreme environments cannot meet the requirements of good environmental adaptability and compact structure at same time,and existing ultrasonic motors with Langevin transducers show better environmental adaptability,but size of these motors are usually big due to the radial arrangement of the Langevin transducers.A novel dual driving face rotary ultrasonic motor is proposed,and its working principle is experimentally verified.The working principle of the novel ultrasonic motor is firstly proposed.The 5th in-plane flexural vibration travelling wave,excited by the Langevin transducers around the stator ring,is used to drive the rotors.Then the finite element method is used in the determination of dimensions of the prototype motor,and the confirmation of its working principle.After that,a laser Doppler vibrometer system is used for measuring the resonance frequency and vibration amplitude of the stator.At last,output characteristics of the prototype motor are measured,environmental adaptability is tested and performance for driving a metal ball is also investigated.At room temperature and 200 V(zero to peak) driving voltage,the motor’s no-load speed is 80 r/min,the stalling torque is 0.35 N·m and the maximum output power is 0.85 W.The response time of this motor is 0.96 ms at the room temperature,and it decreases or increases little in cold environment.A metal ball driven by the motor can rotate at 210 r/min with the driving voltage 300 V(zero to peak).Results indicate that the prototype motor has a large output torque and good environmental adaptability.A rotary ultrasonic motor owning compact structure and good environmental adaptability is proposed,and lays the foundations of ultrasonic motors’ applications in extreme environments.     

Effect of the number of poles on the acoustic noise from BLDC motors

The goal of this study is to examine the effect of the number of poles on the noise from BLDC motors. To this end, the number of slots was fixed to six and the number of the poles was set to four or eight before noise was measured. Motors having different numbers of poles showed clear differences in noise; cogging torque, torque ripple and normal local force were interpreted, analyzed and compared to determine the reason for the differences. To conduct precise comparisons of noise, efforts were made to prevent changes in other variables when constructing the four-pole and eight-pole motors. Noise measurements were conducted after going through the above preparation. The results show that the eight-pole motor produced a lower noise level than the four-pole motor. To determine the cause of the noise, the cogging torque, torque ripple and radial local force were calculated, which are representative noise sources in BLDC motors, and FFT was performed to analyze their frequency components (harmonics). The calculations were made using a finite element method with the Maxwell stress tensor.     

伺服刀架电机的选型研究

针对伺服刀架的控制要求,提供了一种选择其控制电机的计算方法.通过对刀架启动扭矩、偏载扭矩、摩擦扭矩的计算,选用与之匹配的伺服电机.     

通用型液压马达实验台的分析与设计

通用型液压马达实验台的检测实验装置能够模拟实际工况对不同类型、多种规格的液压马达进行性能测试。设计一种通用型液压马达,包括实验台的连接支架设计、转速扭矩仪选型、负载系统设计、油箱设计及油路优化,并对设计参数进行了计算与有限元验证。该实验台可按照国家标准和检测方法,对多种类型不同型号液压马达做性能测试。     

煤层气井有杆排采系统动力驱动设备选型方法

正确选择有杆排采系统驱动设备将有效节约动力运行成本,提高设备使用寿命,为排采设备的设计与选择提供合理依据。在确定三相异步电动机适用于煤层气井排采系统动力设备后,建立了减速箱扭矩和电动机额定功率的数学模型,揭示了电动机瞬时消耗功率的变化规律,并由此给出动力驱动设备的选择方法。结果表明,煤层气井动力驱动装置首选三相异步电动机,电动机的选型需综合考虑额定功率、实际消耗功率、电机转数和起动转矩的影响。电动机实际消耗功率与减速箱扭矩的变化具有一致性,系统平衡良好时,上下冲程中电动机所做的功近于相等,所消耗的功率也大大低于未平衡时的功率。减速箱扭矩为正值时,电机输出功率,而当扭矩变为负值时,电机反而被曲柄轴拖动,处于发电机状态。     

抑制永磁同步电机转矩脉动的转子再设计方法

为抑制再制造永磁同步电机的转矩脉动,提出了单一极内偏心槽、组合偏心槽、磁桥优化的递进再设计方法。以车用JEEMC01003B型永磁同步电机为研究对象,解析了单一极内偏心槽和组合偏心槽对齿槽转矩和谐波转矩的影响。在此基础上进行了磁桥再设计,综合优化了转矩脉动。研究结果表明：与原电机相比,再制造电机的转矩脉动减小了3%,平均转矩增大了0.2 N·m,齿槽转矩减小了6%,铁耗减少了4.7 W/kg,磁密畸变率降低了5.6%,效率提高至97.60%,电机性能明显得到提升。