电机的

The key points of sensorless technology in PMBLDCM are to study a method which can detect rotor position accurately by simply method in whole speed range. After analyzing current sensorless methods of the PMBLDCM, it is found that those methods are successful at middle and high speed, but they often fail to detect rotor position at low speed when the back electromotive force is small or zero.

纵观目前的永磁无刷直流电机的无位置传感器控制方法，比较成熟而可行的方法多集中于电机在中高速区域运行时，能够较准确估计转子位置；电机处于低速、极低速、静止状态时电加热管，因为反电动势幅值较小或者为零，而无法正常工作。

The concept of current regulation factor was defined and the analytic expression of the current regulation factor and the turning points' coordinate of the exterior characteristic curve by use of the mathematic model of magnetization curves were given.

利用电流调整率和拐点坐标分析了电机的恒压性能和带负载能力，得到了电机的恒压性能和带负载能力跟电机各结构参数和励磁电阻的关系。

If this electro-mechanical dynamic model combined with friction model, we can estimate the performance of motor, realize the design, simulation completely by computer.

结合电机的摩擦模型，可预估出电机的性能，可实现该类型电机的设计、仿真一体化。

In the interest of getting good performance of speed and loading capability of the micro motor, at the same time ensuring the high rotary resolution, put forward a kind of new precise rotary motor using piezoelectric stack as actuating element based on inchworm motion.

为了保证微小型电机的速度和承载能力，同时获得较高的运转分辨率，提出一种以压电叠堆为驱动元件基于尺蠖运动原理的新型精密旋转电机方案。电机结构中转子无绕线结构，定子采用柔性铰链双侧对钳方式交替对转子起到钳位作用。

If the above-mentioned display numeric correctly, that is, there is a problem in this area of the motor to the power of checking supplied motor insurance for damage, in General, or this insurance go bad, or connect the line break, the motor go through, this problem can be solved.

如果上背提到的表现数值变态，那么不离是电机这方背有题目了，可以查抄供答电机电源的保障是否败坏，凡是环境下，给么是此保障坏失，给么是不断递电机的线折断，澈底查抄后，此题目可以处置。

To decrease SRM torque pulses, the skew of rotor is also applied to make the rotor and the influence of skew angles on the performances is analysed.

为了减少SR电机的转矩脉动，降低其振动和噪声，本文首次将斜槽的概念引入了SR电机，分析了斜槽角度对SR电机性能的影响。

The main body of a book has been set forth mainly take dismantling the old electric motor stater winding as example,simple dismantling method in not different with occasion.

主要以拆除电机定子旧绕组为例，简单阐述了在不同场合采用不同的拆除方法，及时发现电机的异常问题，及时修理，从而提高电机的使用寿命。

This paper first expounds the principle of the bearingless induction motor, gives the mathematical model of bearingless induction motor and analyzes the rotor flux orientation vector control system of the bearingless induction motor.

本文阐述了无轴承异步电机的基本工作原理，并建立了无轴承异步电机的数学模型，分析了无轴承异步电机的转子磁场定向矢量控制系统。

Because of the temperature rising of ultrasonic motors, load changes, and vicinal surrounding changes and so on, the resonant frequency will shift, leading to working stability drop.

由于超声波电机的温升、负载变化及周围环境变化等原因，使电机的谐振频率发生漂移，这将影响超声波电机运行的稳定性。

Secondly, the vector control theory,the kinematics model and the sinusoidal space vector Pulse-Width-Modulation control technology were analyzed dividually, and then the mathematic simulation model of the servo system of PMSLM was built.

其次，综合运用电机控制理论和计算机仿真技术，分别对永磁同步直线电机的矢量控制原理、运动力学模型以及电压空间矢量脉宽调制技术进行分析，搭建了永磁同步直线电机伺服控制系统的数学模型。

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。