| Co-Investigator(Kenkyū-buntansha) |
KUBOTA Hisao Meiji University, Faculty of Science and Technology, Professor, 理工学部, 教授 (10170036)
MIKI Ichiro Meiji University, Faculty of Science and Technology, Professor, 理工学部, 教授 (20130833)
|
|---|
| Research Abstract |
In this research, one of the purpose of our work is to present a speed-sensoeless vector control method for an induction motor operating at high efficiency and high response, in which core loss is taken into account, and discusses the system's performance for electric vehicle drives. The proposed vector control system consists of a speed-adaptive rotor-flux observer which takes core loss into account and employs a direct-field-oriented control scheme which compensates for the influence of core loss. On the basis of simulation and experimental results, the author shows that the proposed system can estimate motor speed even when the rotor flux is changed.
The next results of this research is to propose that a method of improving the stability of parallel-connected multiple-induction motor drive system fed by a 3-leg single inverter has been devised that employs the averages and differences of estimated parameters for field-oriented control. The parameters and variables of each motor (stator current, rotor flux, and speed) are estimated using adaptive rotor flux observers to achieve sensorless control. The validity and effective of the proposed method have been demonstrated through simulations and experiments. The experimental results show that the proposed method is useful under the condition that the ratings of each induction motor are different.
In addition, this research presents an independent vector control method of parallel-connected two. induction motors by using. a new PWM method of a 5-leg single inverter. In order to achieve independent control of both induction motors using the leg connected in common, the author adopted a particular PWM strategy which can reduce unnecessary switching in each leg. Simulation results show that the proposed method is effective under various driving conditions.
|
