New Concepts for AC Motor Drives Requiring a Wide Speed Range

小行星9510115 在电机驱动应用中，如主轴驱动、钢铁厂和造纸机械，经常需要在宽速度范围内以恒定的压力运行。 恒功率运行在电力牵引领域尤其重要，电力牵引涵盖从机车到电动车辆的广泛应用。 目前，磁场削弱技术被用于加宽传统设计的交流电机的速度范围，但是当恒定功率操作的期望速度范围增加到超过正常（或“额定”）速度的两倍时，对于感应和永磁类型的电机，电动机的尺寸和重量都急剧增加。 在建议的项目中，提出了一个全面的分析，仿真，设计和实验程序，以开发交流感应和同步电机，具有扩展的“恒定功率”磁场削弱范围的能力，而不需要一个超大的机器。 这两种类型的电机的定子绕组的极改变是通过仅使用常规的脉宽调制逆变器适当控制馈送到专门设计的定子绕组的相的电流来实现的。 因此，定子磁极改变机构不一定引入任何附加的开关、接触器或固态（或无源）部件来实现其任务。 通过定子和转子设计的创新概念，将实现扩大磁场削弱范围的目标，这将使这些新电机的尺寸和重量大约是目前用于相同目的的传统交流电机的30%至50%。 ***

9510115 Lipo A frequent requirement in motor drive applications such as spindle drives, steel plants, and paper making machinery is to operate at constant poser over a wide speed range. Constant power operation is particularly important in the field of electric traction which covers a wide range of applications ranging from locomotives to electric vehicles. At present, field weakening techniques are used to widen the speed range of ac machines of conventional design, but as the desired speed range for constant power operation increases beyond twice the normal (or "rated") speed, the motor size and weight increases dramatically for both induction and permanent magnet type machines. In the proposed project, a comprehensive analytical, simulation, design and experimental program is set forth to develop ac induction and synchronous machines which possess the capability of an extended "constant power" field weakening range without need for an oversized machine. Pole changing of the stator winding of both types of machines is accomplished by proper control of the currents fed to the phases of a specially designed stator winding using only conventional pulse width modulated inverters. Hence, the stator pole changing mechanism does not necessarily introduce any additional switches, contractors or solid state (or passive) components to achieve its task. The goal of achieving extended field weakening range will be accomplished by means of innovative concepts of stator and rotor design which will enable these new machines to be roughly 30 to 50% the size and weight of conventional ac machines presently used for this same purpose. ***