期待的力量1
Electrical Engineering and Automation tentacles all walks of life, small to a switch designed to study aerospace aircraft, has its shadow. Health professionals can be engaged in the electrical engineering and operation of the system, automatic control, power electronics technology, information processing, testing technology, research and development, economic management, and electronic and computer technology applications in areas such as the work is "complex" high-level engineering and technology personnel. High-level talents in the field of high demand. It is estimated that with the entry of large foreign enterprises in the fields of expertise will be a big gap, then there is likely to personnel shortage. Electrical Engineering and Automation of electrical information professional is an emerging field of science, but because of people's daily lives and industrial production is closely related to the extraordinarily rapid development of relatively more mature now. High-tech industry has become an important component of the widely used in industry, agriculture, national defense and other fields, in the national economy is playing an increasingly important role. Control theory and electrical network theory is a professional electrical engineering and automation of the base, power electronics technology, computer technology is its main technical means, but also includes a system analysis, system design, system development and system management and decision-making research. There are some characteristics of the profession, that is, combining the strength of power, electrical and electronic technology, software and hardware combined with a cross-disciplinary nature, electricity, electronics, control, computer integrated multi-disciplinary, so that graduates with strong adaptation capacity.
红色芍药
With the rapid development of power electronics, computer science and control theory, a revolution happened in motor drives. Actually, AC drives are the mainstream of motor drives. Permanent magnet synchronous motors (PMSMs) 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. In conventional motion control systems, optical encoders or electromagnetic resolvers are used for this purpose. However, these additional sensors increase the costs of the system and decrease the reliability. With this background, sensorless operation is fast becoming a requirement, and the elimination of position and velocity sensors has been an attractive prospect.电力电子技术、计算机技术以及自动控制技术的飞速发展给电气传动领域带来了历史性的革命，交流调速传动逐渐上升为电气传动的主流。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。在传统的运动控制系统中，通常采用光电编码器或旋转变压器来检测转子的位置和速度。然而，这些机械式的传感器增加了系统的成本，并且降低了系统的可靠性。因此，取消这些装置以提高系统的可靠性并降低成本的研究逐渐热门。
燕子060207
范文：
Electric Power is a most convenient clean safe.And electric power system is a network of electrical components used to supply，transmit and use electric power.
电力是最方便、清洁、安全的。而电力系统是用于供电、传输和使用电力的电气元件网络。
An example of an electric power system is the network that supplies a region’s homes and industry with power — for sizable regions，this power system is known as the grid and can be broadly divided into the generators that supply the power.
电力系统的一个例子是为一个地区的家庭和工业提供电力的网络相当大的地区，这种电力系统被称为网格，可以大致分为供应电力的发电机。
the transmission system that carries the power from the generating centres to the load centres and the distribution system that feeds the power to nearby homes and industries.
产生的传输系统，携带能力中心的负荷中心和分布系统源附近的住宅和工业的力量。
Smaller power systems are also found in industry, hospitals, commercial buildings and homes. The majority of these systems rely upon three phase AC power the standard for large scale power transmission and distribution across the modern world.
在工业、医院、商业建筑和家庭中也可以找到较小的电力系统。这些系统中的大多数依赖于三相交流电源，这是现代世界大规模输电和配电的标准。
