直驱永磁同步风力发电机运行转速低，一般定子外径都比较大。
Direct-driven PMSG works at low speed and its size is generally big.
一旦电机达到接近设计运行转速，离心开关开始动作，关断启动绕组与电网之间的连接。
Once the motor reaches near design operating speed, the centrifugal switch activates, opening the contacts and disconnecting the startup winding from the power source.
改进后大大缩短了轴的长度，使轴的临界转速远在运行转速之上，泵由两个密封改为一个密封。
The modification resulted in a much shorter shaft with a critical speed well above the running speed, and a pump with only one instead of two seals.
讨论了离心泵的运行转速改变后，由于泵效率和管路效率的变化而给整个果装置效率带来的影响，由此可以判断离心泵改变转速后，泵装置的运行是否合理，并可确定泵装置运行的最佳转速范围。
The influence of the change of centrifugal pump rotating speed on the efficiency of the whole pump-unit which due to the variation of the pump efficiency and pipeline efficiency is studied.
不像运行起来比它更稳定的直列六缸引擎或者极其流畅的V - 12引擎，卑微的四缸引擎会以一种比自身机轴转速高两倍的频率产生一上一下的振动。
Unlike the better balanced straight-six or even the ultra-smooth V-12 engine, the humble four-cylinder generates an up and down vibration with a frequency of twice the crankshaft's rotational speed.
交通运行情况是依据颜色来显示的，每种颜色反映着相应的交通运转速度。
这些高频率与离心机的转速相对应；美国对能够以600赫兹以上频率运行的频率转换器驱动的出口进行了严格管控。
These high frequencies correspond to the rotation speeds of centrifuges; America tightly controls the export of frequency converter drives able to operate at frequencies above 600 Hz.
为了满足螺杆空压机运行中的节能，必须有一种高效率变转速的驱动电机。
In order to meet the screw air compressor operation of the energy saving, there must be an efficient change speed motor drive.
但随着负荷率的降低，发动机转速被限制在最小转速下运行，系统的一部分供热量被浪费，一次能利用率降低。
However, with the lower load factor, engine speed is limited to the minimum speed run, part of the system for the heat is wasted, a lower utilization.
进一步分析表明，能耗不能降低的原因仍然是因为转速被稳定在最低转速下运行所致。
Further analysis shows that the reasons for reducing energy consumption can not continue because the speed was stable in operation due to the minimum speed.
为了可靠运行，必须降低转速的波动，即必须有效抑制负载转矩脉动和电机电磁转矩脉动带来的转速波动。
In order to have a reliable operation, must reduce the speed fluctuation, namely must effectively restrain the load torque ripple and motor electromagnetic torque ripple of speed fluctuation bring.
一旦系统运行，对赛车的转速一般应慢慢减少到700至500之间，但发动机会自动不颤抖。
Once the system is running, the RPM of the car normally should slowly reduce to between 700 to 500 automatically but the engine will not tremble.
高扭矩低转速的水平，从而提高其能力在重负载下运行，没有拖延。
High torque at low RPM levels which improves its ability to operate under heavy loads without stalling.
工业制冷机组是在温度、压力变化范围较大、转速较大的情况下运行的。
Industrial refrigeration unit is big changes in temperature and pressure range, running speed of the larger situation.
当达到额定转速后，控制系统需要一个无压降连接(压缩机运行)，在这种状态下接触器必须闭合。
After reaching the rated speed, a potential-free contact (compressor running) is required for control system. The contact must be closed in this state.
实验结果表明：在网络控制系统中无刷直流电动机转速响应快速，运行平稳，证明了这种新型控制系统的有效性和可行性。
The experimental result shows BLDCM response rapidly and run stableness in networked control system and proves the validity and feasibility of this control system.
介绍了风力发电系统的两种形式和并网运行的频率控制、功率控制、发电机转速控制。
Two kinds of wind power generation systems are introduced as well as the frequency control, power control and rotational speed control of generator in parallel operation.
将系统进入闭环运行，利用过程PID控制自动调节达到稳定转速的目的。
Make the system start closed-loop running and use the process PID, control self-adjusting to achieve purpose of stable speed.
在适宜的运行条件下，参考速度可超到极限转速的值。
Under appropriate operating conditions, the reference speed may be exceeded up to the value for the limiting speed.
在液力传动系统中，泵轮和涡轮的转矩及转速应保持稳定才能使系统正常运行。
In hydraulic transmission system, turning moment and rotational speeds of pump impellers and turbines have to be kept steady in order for the normal operation of the system.
当系统的运行工况发生变化时，利用压缩机转速的调节以保持吸气压力的一定。
The compressor speed was regulated to keep the suction pressure constant when the operating conditions were changed.
即使对皮带机实行变速调频，由于煤矿皮带机的运输特点和 和>安全需要，皮带机仍然保持在恒转速运行状态。
Even if the belt conveyor speed modulation, due to the transport characteristics of the belt conveyor and safety requirements, belt conveyor is still maintained at constant speed running state.
采用低转速电机、良好的叶轮平衡及水力平衡轴向力使机组具有噪音低、震动小、运行平稳的特点。
Motor's speed is low, the balance of impeller is good, the axial force is balanced by water power, so the pump features light tremor, low noise and smooth operation.
采用调速技术，使输油泵适应负荷变化，改变转速来调节输油泵的运行点，才是解决泵节流损失的措施。
It is the effective countermeasure against throttling loss in pumps to adopt speed regulator, so as to adjust pump speed according to load variation.
由于减少了齿轮箱和其他相关零部件，发电机的转速每分钟仅16 -17转，风机运行的可靠性和效率显著提高。
Due to no gearbox and other related parts, the turbine runs at low speed with only 16-17 RPM, so the reliability and efficiency is highly improved.
分析了空气旁通率、压缩机转速及空气质量流量等主要设计及运行参数对干燥性能的影响。
The influences of key design and operating parameters, such as bypass air ratio, compressor speed and total air mass flow rate etc.
分析了高速滚动轴承在转速波动这一非平稳状态下的运行状态，研究了转速波动对轴承运转性能和失效模式的影响。
The performance of high speed rolling bearing was studied under unstable conditions of rotation speed fluctuation, and the failure modes of the bearing were analyzed under such conditions.
分析了高速滚动轴承在转速波动这一非平稳状态下的运行状态，研究了转速波动对轴承运转性能和失效模式的影响。
The performance of high speed rolling bearing was studied under unstable conditions of rotation speed fluctuation, and the failure modes of the bearing were analyzed under such conditions.
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