电动机

Ultrasonic wave motor is s new motor according to the principle of that to get turning force from ultrasound oscillation.It differs from traditional motor due to it is without winding and magnetic field.

与传统的电机不同，超声波电动机没有绕组和磁路，是一种由超声振动而得到旋转力的新原理电机，有驻波与行波两种驱动方式。

Permanent magnet synchronous motors have been widely used as AC drives over the last two decades due to their high efficiency, high power density and no dc field winding in the rotor. It is well known motion control of PMSM requires accurate position and velocity signals to realize field orientation.

永磁同步电动机由于无需励磁电流、运行效率和功率密度都很高，在过去的二十年里已被广泛地应用在交流调速传动中，但它的高性能控制需要精确的转子位置和速度信号去实现磁场定向。

Motor windings from burning, and loss of field maintenance in the winding turns, diameter, change the connection method, or repair does not completely rule out the possibility of failure factors will also change the water pump speed.

电动机因绕组烧毁，而失磁，维修中绕组匝数、线径、接线方法的改变，或维修中故障未彻底排除因素也会使水泵转速改变。

Next, the finite element model of induction motor is established by using Maxwell 2D transient module, and the inverter control circuit is also designed by its own circuit design editor. Consequently, a complete field-circuit coupled simulation model of inverter control system is presented.

接下来，利用Ansoft公司的Maxwell 2D瞬态模块建立了异步电动机的有限元模型，并且采用其自带的电路编辑器Schematic Capture设计了异步电机逆变器控制电路，构建了一个完整的变频控制系统场路耦合仿真模型。

Based on the research of underground asynchronous motor protective system,a new measurement and control system of flameproof magnetic starter is developed by using AT89C52SCM as the central control unit.

本文在分析井下异步电动机保护系统的基础上，以AT89C52单片机为中央控制单元，研制了新型矿用隔爆型磁力起动器测控系统。

The familiar motor faults in flour mill are analyzed, and its solutions and maintenance methods are introduced.

对面粉厂常用电动机的常见故障进行分析，并提出了维护措施和保养方法。

The total flow chart of iron and steel industry was introduced, with emphasis on usage of motors.

介绍了钢铁工业的整体流程，并说明了其中电动机的使用情况。

All the control circuits of electromotors are designed base on relay by the start-keep-stop circuit make up of buttons and contectors. The fluid drive is designed base the PLC.

其中各电动机的控制电路采用按钮和接触器组成起保停电路的继电器控制方案；液压传动部分采用PLC控制方案。

We want to buy Electric Motors and Engines, forged Products and Equipment

我们要采购电动机和发动机，伪造的产品和设备

According to Bessel function and Fourier series theory, generation, magnitude and distribution of voltage harmonic generated by single-phase two-level SPWM inverter and three-phase SPWM inverter are analyzed and calculated particularity and concretely in allusion to inverter-motor system.

然后针对逆变器-电动机系统，利用贝塞尔函数和傅里叶级数理论，分别对单相二阶SPWM逆变器和三相SPWM逆变器的输出电压谐波的产生、大小和分布进行了细致而具体的分析和计算。

Finally, according to market conditions and market products this article paper analyzes the trends in the development of camera technology, and designs a color night vision camera.

最后根据市场情况和市面上产品的情况分析了摄像机技术的发展趋势，并设计了一款彩色夜视摄像机。

Only person height weeds and the fierce looks stone idles were there.

只有半人深的荒草和龇牙咧嘴的神像。