电机的

It has been widely used on the free operating of air presser, city automatic water supply and sewage system, and other automatic machines, whose motors have to be protected. Also it can be used dependently as the protective accessories when starting the motors.

被广泛应用于空气压缩机的自动运行、城市的自动供水及排污和其它需要对电机实施保护的自动化设备上；也可单独应用于电动设备上作为电机的启动保护部件。

There is no ferromagnetic material in the outside of ironless PM motors airgap. Because of this characteristic, airgap magnetic field of ironless PM motor belongs to 3-dimentions (3-D) open boundary magnetic field. Engineering problem of open boundary magnetic field is a hot research issue in the computation electromagnetics field recently.

无铁心永磁电机气隙外没有铁磁材料，其自身的结构特点决定了无铁心永磁电机的气隙磁场属于三维开域磁场，开域磁场工程问题的计算是近年来计算电磁学的研究热点之一。

By changing the connection of stator windings to change the pole number,the Mixed pole-changing simplex winding multispeed asynchronous motor can obtain two kinds or above rotational speeds with one set of winding.

混相变极的单绕组多速异步电动机是利用改变定子绕组的接法，以改变电机的极数，从而使电机用一套绕组获得两种或两种以上转速的异步电动机。

After referencing the specification of the national standard GB/ T11648-89, according to the petroleum industry condition, the torsional vibration, pendular vibration, exciting force self-synchronizing and stability of synchronizing,the stability of vibrate synch ronous transmission of two and more long vibration motors are tested. All of above testing parameters will replenish the blank of both product development and quality test measure of this type of motors both here and abroad.

参阅国家标准GB／T11648-89的技术要求，并针对石油现场的实际条件，本课题对两台和多台隔爆长形振动电机的扭振、摆振、激振力大小，自同步性和同步状态稳定性，振动同步传动稳定性等技术参数进行了模拟动态测试，而这些新增设技术参数的测试均是填补国内外此种新型电机产品研制开发和质量检验测试的技术空白。

At the same time the main control system has been described detailedly,which includes the control of the taboret's step motor and the main shaft's direct current machine,also their gang control.

介绍了一种基于单片机的家用电脑绣花机的电控系统，对其系统结构和硬件系统作了部分介绍，并且对其主控部分即绣框步进电机和主轴直流电机的分别控制以及联动作了详细的描述。

Permanent Magnet Synchronous Motor drived by triphase sinusoidal current is research object in this paper . Its mathematics models in several coordinate are set up , controlling principles of flux linkage and torque are discussed under DTC and the block diagram of PMSM with DTC is presented.

本文以三相正弦波驱动的永磁同步电机为研究对象，建立了其在不同坐标系下的数学模型，并深入探讨直接转矩控制中永磁同步电机的磁链和转矩的控制思想，给出控制方案。

Firstly,by moving and circumrotating coordinate switching the complex model of tri－phase AC aosynchronism motor to Magnetization－Torque two axeses,The physical model of AC color Is transformed model of DC motor approximately,It is convenience to control the motor.

首先，经过坐标的平移和旋转变换，将原三相交流异步电机的复杂模型转换到M－T（Magnetization－Torque）两轴旋转坐标系上，将交流电机的物理型等效地变换成近似于直流电动机的模型，为控制带来方便。

First1y, by moving and circumrotating coordinate switching thecomp1ex model of tri--phase AC asynchronism motor to Magnetization-Torque two axeses, the physica1 mode1 of AC motor is transformedmode1 of DC motor approximate1y, it is convenience to contro1 the motor.

首先，经过坐标的平移和旋转变换，将原三相交流异步电机的复杂模型转换到M-T(Magnetization-Torque)两轴旋转坐标系上，将交流电机的物理模型等效地变换成近似于直流电动机的模型，为控制带来方便。

Fuzzy control is applied to variable-frequency regulating speed of AC induction motor in this thesis, where one kind of fuzzy controller of speed is designed with Mamdani model. Then the slip frequency control system made up of fuzzy controller is simulated, the simulation results show that its performance is better than that of general PI controller.

论文将模糊控制技术应用于感应电机的变频调速，采用Mamdani模糊逻辑模型，设计了一种转速模糊控制器，并对基于模糊控制的感应电机转差频率控制系统进行了数字仿真，结果表明模糊控制的控制性能优于常规的PI调节器。

Based on the comparison between several present schemes controlling DC motor with PWM, a design scheme for drive circuit fit to EPS is presented, in which both low side and high side are N-MOS and high side is either in fully-off or fully-on state while low side is controlled by logic circuit.

在分析电动助力转向系统电机驱动电路性能和可靠性要求的基础上，对比常用的PWM控制直流电机的优缺点，提出了电动助力转向系统驱动电路的设计方案：上、下管均采用N沟道MOS管，上管常通或常闭，下管由PWM逻辑电平控制。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。