轻载

This paper analyzes the unbalancing problem of neutral-point voltage with light load in DC-Rail ZVT soft-switching inverter.

分析了轻载时直流母线零电压过渡软开关逆变器存在的中点电压不平衡问题。

With rapid technological development of gearless permanent magnet synchronous, it is required that the weighting system is able to not only provide signals for under load and full load to prevent overload, but also present and feedback precise weight signal to transducer, which automatically adjusts starting torque of motor by weighting signal and starts elevator smoothly.

随着无齿轮永磁同步电梯技术的迅速发展，要求称重系统不仅提供轻载、满载信号、限制超载、更应能够给出准确的称重信号，将称重信号反馈给变频器，变频器根据称重信号，自动调整电机起动力矩，使电梯平稳起动，称重系统也由限制超载的辅助部件，转变成为实现电梯起动力矩补偿，防止起动侧溜的重要功能部件。

Normal parking: Turn off the exhaust valve, so that pump light on the motor to stop.

正常停车：关闭排出阀，使泵轻载，停转电机。

Normal parking: turn off exhaust valves, so that pump light load, stopping the electrical switch.

正常停车：关闭排出阀，使泵轻载，停转电机。

In the medium and high power SMPS, phase shifting controlled ZVS PWM full-bridge converter is favour topology. But in this converter, ZVS is difficult to be achieved for the lagging leg at light load.

在中大功率应用中，通常采用于移相控制ZVS PWM DC/DC全桥变换器，该电路在轻载时难以实现滞后桥臂的零电压开通。

Therefore,taking losses and torque ripple into account,the open-phase operation should be avoided as far as possible even though the motor is at light loads.

因此，从减小损耗与转矩波动两方面考虑，自起动稀土永磁电机即使轻载工况下也应尽量避免断相运行。

The following functions can be realized: Measuerment:the effective values of three phase current and voltage, power frequency, active power, reactive power, power factor etc. Motor control: direct starting, converse starting, star and triangle starting, self-starting. Protection:thermal overload protection, current leakage protection, open-phase protection, three-phase unbalance protection, over voltage protection, loss voltage protection, low load protection and fault warning and fault dates memory. Communication: communication of the computer in control room and the microcomputer monitor in the spots is realized by the interface of RS-485. The motor is not only controlled in the spots but also in control room. The dates, information and some functions are shared by the spots and control room too.

该电动机监控器以80C196KC单片机为核心，通过采样三相电流﹑电压信号来实现以下功能：三相电流﹑电压有效值，电网频率，有功功率，无功功率及功率因数等的测量；对电动机实现直接、正反转、星三角及自起动控制；对电动机实现热过载、漏电、断相、三相不平衡、过压、欠压及轻载保护，对故障进行报警及数据记忆；通过RS-485串行接口与中央控制室计算机实现通信功能，对电动机既可本地，也可远程控制；实现控制现场与控制室之间数据、信息、功能共享。

The hoisting and slewing mechanisms of QTZ125 tower crane use wire-winding electric motors, and steady hoisting and slewing can be realized, Besides, it can provide high speed for light load and low speed for heavy load, working efficiently with little noise.

QTZ315塔机起升机构及回转机构均采用绕线电机，起升、回转平稳，可实现轻载高速，重载低速，工作效率高，噪音低等优点。

The friction between teeth of light-load precision involute spur gearing mechanism was studied by using of the line-contact isothermal EHL under the condition of the well-lubricating.

运用线接触等温弹流理论详细考察了精密轻载渐开线圆柱直齿轮在润滑良好情况下的齿间摩擦力，研究结果表明良好的润滑会使齿间摩擦对轮齿弯曲疲劳强度的影响显著降低但仍然不可忽视。

The article introduces the principle,structure and application of a new type of environment-protecting and energy-saving soft starter of electric motor using single-chip 80C196KC and thyristor AC-voltage regulation circuit,and provides the software and hardware design of this system.

该系统结构简单，参数调整灵活，能平滑、无级地起动三相异步电动机，是一种集电机软起动、软停车、轻载节能和多种保护功能于一体的新颖电机控制装置。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐