必须保护感应电动机，防止过载和欠压。
It is necessary to prevent induction motors against overload and undervoltage.
以热保护为研究对象，充分考虑了电机的热积累现象，通过求解热平衡微分方程的方法，给出了新的电动机过载保护判据。
Based on the method of solving heat balance differential equation, a novel over-load protection criterion for electric motor is presented in the paper considering the heat accumulation of motor.
本设计装置主要用于中小型交流电动机的综合保护，它具有断相、过载短路保护功能。
The designed installation is mainly used in synthetic protection of small AC motor. It has the functions of phase failure protection and overload short protection.
通过分析刮板输送机的过载机理，对电动机冲击力矩有了更深入的认识。
Thorough understanding of impact force of motor is achieved through analyzing the overload mechanism of armored face conveyor.
热过载继电器是一种重要的低压保护类电器，广泛应用于电动机的保护领域。
The thermal overload relay is a kind of low-voltage protection apparatuses which is widely used in the field of motor protection.
过载保护技术是低压电器智能化技术的重要组成部分，是保证电动机、配电线路安全运行的重要技术。
The over-load protection technology is an indispensable constituent of the low-voltage apparatus intellectualization, ensuring the electric motor and the distribution line safe operation.
分析了煤矿井下小型隔爆电动机过载、断相保护存在的缺陷，提出了改进的保护方案。
The existing defect of overload, open phase protection of minitype flameproof motor used in coal mine was analysed and its improved protection scheme was presented.
电动机的最大过载倍数主要是和交轴同步电抗和换流电抗有关。
The maximun overload capacity of the motor depends essentially on the synchronous reactance along the quadrature axis and on the commutation reactance.
三相电动机包括过载保护磁起动机。
Three phase motors, when furnished, include magnetic starters of overload protection.
液力联轴器是一种应用广泛的通用传动装置，它利用液体动能来传递功率，能改善电动机起动性能，实现过载保护。
Fluid coupling has an abroad application by drive unit, in the course of using. It USES liquid kinetic energy to transfer power, improves electromotor start capability, realizes over loading protect.
本发明可以增强电动机的过载能力、节约线材、降低制造成本。
The invention is capable to enhance the overload capacity of the motor, save wires and reduce manufacturing cost.
本文还建立了电动机过载保护的硬件和软件平台，实现了电动机运行、过载保护、参数组态、监控的网络化。
The hardware and software is established. The motor's operation, overload protection, parameters configuration, monitoring can be achieved through the network.
电动机过载保护通常采用继电器，而配电线路过载保护多采用断路器的长延时过电流脱扣器来完成。
Protection against motor over - load usually adopt thermal relay, but protection against line over - load usually adopt long delay over- current release of circuit- breaker.
可控制交流50Hz，380V，三相异步电动机的直接起动停止，并具有过载和断相及失压保护。
Able to directly control AC 50Hz, 380V asynchronous motor with the protection of overload, phase-failure and voltage-absent.
从仿真结果可以看出电动机的在线离散化递推算法能够很好的区分电动机的冷态过载和热态过载。
The simulation result demonstrated that the cold condition overload or hot condition overload can be distinguished by the discrete recursion algorithm for calculating temperature rise online.
但是直流电动机具有良好的调速性能、较大的起动转矩和过载能力强等许多优点，因此在很多行业中应用。
But, DC motor has much merit, such as: batter speed performance, bigger starting torque and stronger overload capacity, etc. Therefore, it is applied widely in many industries.
ZSN4系列直流电动机是在Z4系列直流电动机基础上开发设计的具有高起动转矩、高过载能力电机，主要应用于驱动水泥回转窑等设备。
Series ZSN4 DC motors are the new generation of Z4 Series DC motors with high starting torque and overload. Mainly used as the drive equipment for cement rotary kiln.
还可实现电动机的过流、过载、缺相等多种保护以及轻载节能运行，应用非常广泛。
Its application was widely, which can realize low cost running and protection, such as over current, over load and phase breaking.
本系列配电箱可作为动力照明、电动机控制，对电路进行过载、漏电及短路保护之用。
This series of distribution box can be used as lighting power and electric motor controlling to avoid the overloading, electricity leaking, short-circuit of circuit system.
介绍了一种利用电动机正、负序等效电流实现电动机热过载保护的方法，给出了保护动作的数学模型、离散算法及其计算机实现方法。
A thermal overload inverse time equation that is quite close to the real thermal locus of motor and its implementation method are proposed based on the thermal characteristic of motor.
主机和电动机通过液力偶合器连接，能够缩短电机起动时间，减少起动过程中的平均电流，防止动力过载。
Main machine and motor connected through the fluid coupling, it can shorten the motor start-up time, reduce the average current during start and prevent overload of the power.
主机和电动机通过液力偶合器连接，能够缩短电机起动时间，减少起动过程中的平均电流，防止动力过载。
Main machine and motor connected through the fluid coupling, it can shorten the motor start-up time, reduce the average current during start and prevent overload of the power.
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