多电动机的

Researches show that the drive force characteristics of the electric tractor drive system based on series DC motor is close the ideal characteristics, the curves are concave, low speed with constant power, and high speed with constant torque; the electric tractor has large working speed under different shifts, but the extensive coincidence speed shows that the variable ratio of the gear is unreasonable; the maximum climbable gradient of this electric tractor is more than 30%, and does not need frequent shift when working for its extensive climbable gradient; there are many influence factors of continuous working time, which the more obvious factors are working speed and working load, the working time increases with the increase of the working speed and working load.2. Simulation researches on the drive characteristic of the electric tractor.

研究结果表明：基于串励直流电动机(来源：ABC21论文网www.abclunwen.com)的电动拖拉机电驱动系统的驱动力特性场接近理想驱动力特性场，其各挡下的驱动力特性是一组下凹的曲线，低速恒转矩，高速恒功率；同一行驶速度下所对应高挡驱动力大于低挡驱动力，这是由电机的调速特性决定的；电动拖拉机各个挡位下具有较广的稳定作业速度范围，但是各个挡位之间速度重合的范围较多，说明所用变速箱变速比与电动机匹配不合理；电动拖拉机最大爬坡度达到30%以上，并且各挡爬坡度变化范围较广，作业过程中不需要频繁换挡；影响电动拖拉机连续作业时间的因素较多，其中作业行驶速度和作业负荷影响最为明显，作业负荷越大，连续作业时间就越短，作业速度越快，连续作业时间就越短。2、电动拖拉机驱动特性仿真研究。

Companies leading products for Y80-355 aircraft Zuohao three-phase asynchronous motor and more than 20 spin-off series dedicated motor.

公司主导产品为Y80-355机座号三相异步电动机及二十多个系列的派生专用电动机。

This text make deep analysis and design to single winding many speed electronic electromechanical motive.

本文是对单绕组多速电动机电动机做出深入的剖析与设计。

Three-phase squirrel-cage induction motor in its structure is simple, cost-effective and of good work, and many other advantages, in today's industrial applications in various fields have a wide range of applications, but it is an obvious shortcomings, is the starting current too big ( General starter for the rated current of the current five to seven times or even greater), so regardless of the motor itself, or the power grid and other electrical equipment, will have a negative impact.

留学解答资讯网：三相鼠笼式异步电动机以其结构简单、性价比高和工作特性好等诸多优点，在当今工业应用的各个领域都有广泛的应用，但它有一明显缺点，就是起动电流过大(一般起动电流为额定电流的5～7倍甚至更大)，这样不论是对电动机本身，还是对电网以及其他电气设备，都会产生不利的影响。

By changing the connection of stator windings to change the pole number,the Mixed pole-changing simplex winding multispeed asynchronous motor can obtain two kinds or above rotational speeds with one set of winding.

混相变极的单绕组多速异步电动机是利用改变定子绕组的接法，以改变电机的极数，从而使电机用一套绕组获得两种或两种以上转速的异步电动机。

A model of self-controlled synchronous motor (including double armature winding synchronous motor) is developed which takes account of damper winding according to its actual structure. The damper winding is represented by two sets of loop on each axis based on multi-loop method and bar currents may be calculated.

本文首先建立了包括参数计算在内的自控式同步电动机（包括双电枢绕组自控式同步电动机）的数学模型，该模型采用多回路法处理阻尼绕组，便于计算阻尼条的电流，可以比较准确地分析阻尼绕组对电机运行性能的影响。

This real-time system includes measurement and control of analogs, digitals, temperature, DC motor and stepping motor.

这个实时系统对多个开关量、模拟量、温度信号、直流电动机和步进电动机等进行实时的数据采集和控制。

The oil pump control system of governor oil pressure unit at power plant of Naban reservoir was modified with contact-free,soft start,intelligent pressure control unit,which not only remove the defects from traditional oil pump motor control mode consisting of relay and contactor,but also upgrade the control automation degree,improve starting performance and permit convenient operation.

通过利用无触点的智能软启动压力控制装置对那板水库电站调速器油压装置油泵控制系统的改造，解决了油泵电动机采用传统继电器———接触器控制方式所存在诸多缺陷，提高控制的自动化程度，改善启动性能，方便操控，经过3年多的应用，运行良好，为水电站的调速器油压装置油泵控制提供了一个好的借鉴。

The company has over 20 series and over 300 specifications of products including 3-phase asynchronous motor, 1-phase asynchronous motor, grinding wheel machine, grinding plate machine, wire saw, tape saw, woodworking machine, etc.

主要生产三相异步电动机、单相异步电动机以及砂轮机、砂盘机、线锯机、带锯机、木工车等20多个系列、300多个规格的电动工具产品，年生产能力100万台，出口创汇2000万美元，是全国重点出口骨干企业。

The paper briefly deals with methods and steps of changing three-phase single-speed motor into multi-speed motor.

三相单速异步电动机可以通过定子绕组的改绕成为多速电动机。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。