No-coupling SACS motor testing

The paper analyzes the disadvantages of the conventional testing system for the single-phase AC series-excited motor (SACSM), introduces a kind of no-coupling motor testing system: the motor testing without the sensor speed detection; constructs the mathematic model and gives the method of parameter identification; describes the method of speed detection; puts forward a kind of new genetic algorithm based on the social hierarchic rank which is used to parameter identification of motor model in SACSM testing system, and adopts the idea that reduces searching scope of genes according to individual fitness, and designs a changeable scope searching operator which makes the genetic algorithm optimize parameters of motor more effectively. Experiments show that the testing system can be maintained conveniently to help obtain the desired results.