In long-primary linear induction motor ( LPLIM) which is section powered with traditional power supply, the movement of the secondary changes the length it overlaps with every section of the primary, which leads to results that the motor parameters vary and the load can' t be precisely controlled. In order to solve this question, a power supply network with intermediate bus was designed, which made the model and parameters of the motor fix in the entire process and guaranteed various control methods to realize high per-formance. In the light of anti-parallel thyristors as the sectional power supply switch, the "Mathematical-Physical" models of a thyristor turn-on and turn-off process were established. The transient process and its influence of the transfer switches used in section powered linear induction motor were analyzed. A section powered two-primary LPLIM prototype was applied to experiment. The experimental results tally with the analytical value, which verified the correctness of the theoretical analysis.%针对采用常规分段供电方式的长初级直线感应电机由于次级的运动,其覆盖每段定子的长度不断变化,导致通电定子段电机参数不断变化,无法对负载实现精确控制的缺点,设计了带中间母排结构的分段供电网络,可以保证电机在整个运行过程中模型和参数固定不变,能够利用现有各种控制算法实现高性能控制. 对于采用反并联晶闸管作为分段供电切换开关,从晶闸管开通和关断的"数学——物理"模型出发,分析了分段供电切换过程中开关暂态过程及其对电机性能的影响. 利用某采用分段供电的长初级双边直线感应电动机原理样机进行实验,实验结果与理论分析相吻合,验证了理论分析的正确性.
展开▼
