Research status of permanent magnet synchronous motor

Research status of permanent magnet synchronous motor




Early research on permanent magnet synchronous motor mainly fixed-frequency power supply operating characteristics of permanent magnet synchronous motor research, especially in steady-state characteristics and performance of the direct start. Permanent magnet synchronous motor is starting to rely on the direct provision of damping winding asynchronous motor torque to accelerate to near synchronous speed, and then by the reluctance torque and synchronous torque will pull into the synchronous motor. VBHonsinger and MARahman and others have done a lot in this area of research.

Foreign eighties of last century began inverter permanent magnet synchronous motor in-depth study. Power inverter permanent magnet synchronous motor with permanent magnet synchronous motor for starting the same structure, but in most cases, no damper winding. Damper winding has the following drawbacks: First, the damper winding heat, the permanent magnet material temperature rise; second, larger moment of inertia damper windings, the motor torque inertia ratio decreased; Third, the alveolar damper winding torque of the motor pulse increased. In the inverter case, the original characteristics of permanent magnet synchronous motor would be affected, the steady-state characteristics and transient characteristics and a constant frequency of permanent magnet synchronous motors have different characteristics compared. After 1980, a large number of papers published research permanent magnet synchronous motor mathematical model, steady-state characteristics, dynamic characteristics. AVGumaste other of voltage inverter, steady-state characteristics of permanent magnet synchronous motor and the current inverter, steady state characteristics of permanent magnet synchronous motor.

With the permanent magnet synchronous motor control system performance requirements of the continuous improvement of the need to design a high efficiency, high torque inertia ratio, high energy density permanent magnet synchronous motor, GRSlemon speed control system and others for fast dynamic performance and high efficiency requirements, proposed the modern design of permanent magnet synchronous motor.

With the micro-computer technology, permanent magnet synchronous motor vector control system of full digital control has achieved great development. D. Naunin so developed a permanent magnet synchronous motor vector control system, using 16 single chip 8097 as a control computer, to achieve a high precision and high dynamic response of the full digital control. The late eighties, early nineties has published extensively on such BKBose Permanent Magnet Synchronous Motor Vector Control System Digital Control of paper.

Permanent magnet synchronous motor vector control system using PI speed controller is mostly (PI) control. PI controller has simple structure, good performance of the control object parameters are not sensitive to the advantages. 1991, RBSepe for the first time in the speed controller with self-tuning control. Early adaptive control systems are mainly used in DC motor speed. National Taiwan University Images From the first time, robust control theory such as permanent magnet synchronous motor servo drive. Motor during operation, the model and the parameters are changing, changing the model parameters and control system performance will lead to the decrease. Modern control theory in a variety of robust control techniques to the control system parameters in the model and to maintain good performance. Therefore, various robust control techniques used in the field of motor speed, can greatly improve the speed performance of the system. In this regard, the use of the more successful control techniques are: adaptive control, variable structure control, parameter identification techniques.

Adaptive control techniques to improve control of objects and changes in operating conditions when the control system performance, N. Matsui, JHLang and others will be adaptive control technology for permanent magnet synchronous motor drive system. Simulation and experimental results show that the adaptive control technology enables speed control system in the motor parameters change to maintain good performance. Sliding mode control due to its special "switch" control mode and the motor speed control system inverter "switch" model similar to the robust control and has good features, so in the field of motor control has broad application prospects .

Motor parameter changes on-line identification, and identification of the parameters used to control speed control system, but also to improve the control system robustness. With the development of artificial intelligence, intelligent control has become a modern control an important branch of the field, electric drive control system of intelligent control technology has become a major electrical transmission control direction, and electric drive technology will bring new era. At present, an effective way to achieve intelligent control has three: expert system based on artificial intelligence (ExpertSystem); based on fuzzy set theory (FuzzyLogic) fuzzy control; based on artificial neural network (Artificia1NeuralNetwork) neural control. BKBose and others from the late eighties has been working in the field of artificial intelligence applications in electric transmission and achieved gratifying results of research.