本文提出机床床头箱辐射的噪声声级与其空载功率有密切关系，并导出计算机床噪声的经验公式。
The paper concludes that noise pressure level emitted from the headstock of a lathe is closely related to its idle running Empirical formula has been derived for calculating machine noise.
永磁体分散性对空载电流、空载功率因数、负载功率因数和过载能力影响较大，而对额定运行时的效率、电流影响不大。
In addition, the dispersibility has great effects on the noload current and power factor while the effect on rated efficiency and rated current is little.
此方法精度高，比现有机床试验规范推荐的方法简便易行，可在机床空载功率试验、效率试验以及机床节能研究中得到广泛应用。
It is much more simple and practical than the traditional method and can be used widely in the test of idle power and efficiency, and in the research on energy saving of machine tools.
在轻载或空载时由于存在大的功率损耗，双极性PWM控制只能被应用于中、小功率伺服控制系统。
As the existing great power consumption of empty-load or light-load, the bipolar PWM control can be applied only in small or middle power servo control systems.
通过对三相异步电动机空载实验中遇见的故障——三相相间功率的极大不对称性进行分析。
Through analyzing the asymmetry about the power among three phase of the no-load experiments of the triphase asynchronous motor is designed.
仿真结果表明，此功率因数控制系统在空载和轻载时，可节能30%—50%，本论文为异步电动机的节能运行提供了重要的参考作用。
The simulation result demonstrates that it can save up capacity about 30-50% when there is no load or a little load. This thesis can provide important reference function.
黑启动初始阶段，小系统空载运行的情况下，由于逆功率保护而往往发生机组并车失败问题。
When a small system is in on-load operation in the early stage of black start, unit paralleling may fail due to reverse power protection.
对同步电机试验中的空载点和零功率负载点两个特殊工作点的运行情况进行分析。
This paper aims at the analysis of the operating modes at the two special working points:the no load point and the zero power loading point, during testing the synchronous electric machine.
绘制给定失速扭矩和空载速度时的力矩曲线和功率曲线，不含负荷转速。
Plots the torque speed curve and power curves for given values of stall torque and no load speed.
并采用优化设计、高导电磁材料制作，致使设备在空载时损耗低、功率输出更强劲、稳定、寿命更长。
And adopting the optimization design, high conductivity, the electromagnetic material production equipment in no-load loss low power output, more powerful, and stability, long service life.
本文主要对同步电机试验中的空载点和零功率负载点两个特殊工作点的运行工况进行了分析。
This paper mainly discusses the two operating points for the test of synchronous machines, no-load point and zero power loading point.
异步电机是一种为数众多的动力设备，当电机运行于轻载或空载时，其效率和功率因素都很低。
Asynchronous motor is a kind of popular power equipment. When the motor is in light or idle run, the efficiency is quite low.
变压器的空载试验中，由于功率因数低，空载电流不是正弦信号，高精度测量其有功功率具有一定的难度。
In the no-load test of transformer, because of the low power factor and non-sinusoid current waveform, the high precision measurement is difficult.
航空同步发电机用零功率因数负载特性和空载特性所测得的波梯电抗数值比正常值大，致使在电机分析和计算中无法使用。
The value of Potier reactance of aircraft synchronous generator is larger than regular one in the tests of the inductance load and no load operating characteristics.
能提高电动机在轻载或空载时的功率因素。
It can improve the power factor of the motor when it is under low load or no load running.
其结果表明，此功率因数自动控制系统在空载、欠载运行时节能效果显著。
The simulation results demonstrate that it can save up energy about 30-50% when there is no load or a little load.
高压交流输电线路单位长度充电功率很大，由于空载长线电容效应将会引起很高的工频过电压。
Because of large capacitive charging of long ac transmission line, capacitance reaction of no loaded line will cause severe overvoltage.
高压交流输电线路单位长度充电功率很大，由于空载长线电容效应将会引起很高的工频过电压。
Because of large capacitive charging of long ac transmission line, capacitance reaction of no loaded line will cause severe overvoltage.
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