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A low frequency rolling bearing fault diagnosis method based on local projective noise reduction;2. According to characteristics of both the vibration signals and the stator currents when appering a fault in the rolling bearing of the induction motor,Park vector module signal of the three-phase current is calculated,and the envelope of vibration signals from the rolling bearing of the motor is analyzed.

根据感应电机轴承发生故障时的振动信号特性以及定子电流特性,求出三相电流的Park矢量模信号,并将其与电机滚动轴承振动信号经解调处理后的包络信号进行融合分析,可以从振动信号与电流信号的融合谱图中有效地提取轴承故障特征信息,并将其作为故障识别的依据。

The discussion of hardware design of the unit are focused on the three respects: the measurement and the control of warp tension, the driving of the warp beam.

本文综述了前人在织机送经研究领域的成果,讨论了新型织机理想送经机构的特性和电动送经装置的模式,提出了用步进电机作为送经电机、单片微机作为控制器的新型电动送经装置方案,从经纱张力感测、控制和织轴驱动三个方面论述了该电动送经装置的硬件设计方案。

Sewerage pump pool must be installed at lower place,designed for discharging the castoff that producted by men in time.all the live draining water from the basement,such as basin,commode,washer machine,fabric pool,shower bath and bathtub so on contact with the sewerage pump pool ,and than drain into sewage well outside by passing through the watershoot,the pump pool should not have water ,or it will drunk the pump machine bad,make which can not operate normally.

对我来说有点难,请高人帮忙看看如何翻!急!污水泵池是为了及时排出生活中所产生的废弃物而设计的,必须安装在较低的位置。地下室所有的生活排水,如:面盆、恭桶、洗衣机、墩布池、淋浴间、浴缸等设施的排水都要经过排水管道与污水泵相连接,再通过排水管道直接排至室外污水井,泵池内不应有水,否则会泡坏污水泵电机,导致电机不能正常运行。

First the passivity of motor rotor flux subsystem is proved. Workless forces have no influence on the energy balance equation and have no effect on the asymptotic stability. Then it is discussed that the system can stably track the reference rotor flux without rotor flux observer. At last an adaptive PBC strategy is proposed with regard to the rotor resistance change. A clear and simple design for the speed control subsystem with inner current loops is presented.

证明了感应电机转子磁链子系统的无源性,找到系统能量耗散特性方程中的无功力,它不会影响系统的稳定性,得出无需转子磁链观测反馈即能稳定跟踪转子磁链的参考值,同时考虑电机转子电阻在运行中发生未知变化,设计自适应调节器使系统对转子电阻呈现鲁棒性,构建了带电流内环速度控制系统。

A new multi-degree of freedom ultrasonic motor using in-plane deformation of lead zirconate titanate elements was introduced.

介绍了一种新型基于压电陶瓷平面内应变特性的多自由度超声波电机,该电机通过两个平面内的弯曲振动模态的叠加实现转子绕Z轴的转动;并利用伸缩振动模态分别与上述弯曲振动模态叠加实现转子绕X轴和绕Y轴的转动。

By using Fourier series,the relation between the value and harmonic of cogging force and the number of slot and pole was acquired.

对微型短初级永磁直线无刷直流电动机进行了优化设计研究,在电机槽数不变的情况下,设计不同的电机绕组分布方式和初级长度内对应永磁体的数目,并进行了齿槽力的分析和研究。

Permanent Magnet Synchronous Motor driven by triphase sinusoidal current is studied object in this paper. The movement equtions in several coordinates are set up based on the analysis of electromagnetism restricted relation.

本文以三相正弦波驱动的永磁同步电机为研究对象,在深入分析其内在电磁约束关系的基础上,给出了不同坐标系下的运动方程,根据其数学模型,确定了电动车用电机在旋转坐标系下的矢量控制方案。

The characteristic frequencies of the rotors in the cases of eccentricity, unbalancing and transverse bending of the rotor were obtained.

以旋转频率分量的量值作为电机质量检测的指标,建立一个电机质量检测的简单系统和精密的诊断系统。

The pump runs with an abnormal noise, could you check the shaft center lines between the motor and pump to see if they are aliened?

这台泵运转的声音不正常,请检查一下电机和泵的轴线69 这台泵运转的声音不正常,请检查一下电机和泵的轴线是否正常。

This article introduced the manipulator, it outputs four groups by PLC to actuate the abscissa axis, the z-axis, the chassis rotation, hand-rotating motor separately, and controls the manipulator abscissa axis and the z-axis pint pointing, the micro switch bequeaths the position signal to the PLC main engine; The electrical machinery drives the hand fingernail and the chassis revolve; The solenoid valve controls air valve the switch to control the manipulator hand fingernail to gather, then realizes the manipulator proper motion function.

本文介绍的机械手是由PLC输出四路来分别驱动横轴、竖轴、底盘转动、手转动电机,控制机械手横轴和竖轴的精确定位,微动开关将位置信号传给PLC主机;电机拖动手爪和底盘旋转;电磁阀控制气阀的开关来控制机械手手爪的张合,从而实现机械手精确运动的功能。

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