1、英文原文A Direct Torque Control for a PMSMG. Mino-Aguilar, A. Michelle Domnguez, R. Maya, R. Alvarez, L. Cortez, G. Muoz, F. Guerrero, S. Maya, A. M. Rodriguez, F. Portillo, H. Azucena. Benemrita Universidad Autnoma de Puebla, Mexico. Abstract For a long time, permanent magnet synchronous motors (PMSM)
2、were only applied in some particular fields, e.g. for servo drives. However, in recent years PMSM gained increasing importance in novel domains like automotive hybrid drive trains . For Mexico, this boom represents a valuable opportunity for universities and research institutions, so that together w
3、ith Mexican industry of the Electric Vehicle (EV) forming partnerships that result in an infrastructure that will enable the country to develop its own technology in terms of EV. This paper presents a competent and not complex direct torque controller (DTC) for PMSM drives. 1. Introduction. The stud
4、y of the electric machine and control has been toughened by two major universal problems: pollution (water, ground, and the atmosphere) and overpopulation. This last one has created in part extremely high demands of power and personal means of travel, and this has inevitably resulted in the first .
5、An increase of electric motors efficiency, which consumes more than half the electricity generated, can result in an important electrical energy savings . In recent years the trend has changed from not only improving the design characteristics of the electric machine by developing better ways to con
6、trol them, but also using digital systems, power electronics and advanced techniques of control . In particular, the three-phase induction motors (IM) are commonly used in industry, because not only do they have a simple design, but also they are reliable and inexpensive. The permanent magnet synchr
7、onous motors (PMSM) are increasing in popularity due to their high efficiency and power density. Many motor applications require a precise control of both speed and torque, which is possible by using frequency converters between the power lines and the motor. Another way to save electricity is by ad
8、justing the motor speed . Nowadays it can be said that the trend of use variable speed drives has increased significantly, especially where the torque and speed are to be varied to control the speed, position, flow and torque. Among the various methods used to control motors, the direct torque contr
9、ol (DTC) technique has an important place. This technique involves the respective control of the torque and flux linkage by selecting a proper voltage vector. The essential idea of DTC is to pick an appropriate voltage vector using a predefined switching table. This is achieved by calculating the in
10、stantaneous torque and flux from the stator machine variables. The torque and flux are controlled directly and independently through the selection of optimum inverter switching states and limiting the errors of the flux and torque by hysteresis controllers. DTCs operation is illustrated in Fig. 1. T
11、he DTC has advantages for implementing a driver of low-cost and high performance, because the only parameter of the engine involved is the stator resistance. The well-known DTC is implemented in Matlab/Simulink to observe the performance of the PMSM at different speeds and loading conditions. Blocks
12、 were implemented for the models such as the MSIP, the DTC, the park transformation and the inverter.2. Direct Torque Control (DTC). Direct torque control, is a vector control method, Figure 1. Diagram of a typical DTC PMSM drive.which incorporates the control voltage converter inside the speed cont
13、rol algorithm. The optimal switching sequence of the inverter transistors (VSI) is directly based on the state of flux and electromagnetic torque of the PMSM. The necessary calculations are performed using the equations from the model of the PMSM as well as currents and voltages in the stator termin
14、als . The general DTC premises are -The estimated instantaneous flux vector should remain close to its reference. -The estimated torque should remain close to its reference. -The dynamic engine behavior can be studied from sudden changes that may occur both in the reference speed of the rotor or fro
15、m the torque reference value. These assumptions involve four major tasks a) Determine the appropriate values of the references. b) Calculate the actual values of the flux vector and electromagnetic torque. c) Make an appropriate interpretation of the errors between estimated values and their referen
16、ces. d) Manipulate the state of the inverter to reduce the speed error. Fig. 1 shows the DTC for a PMSM block diagram. One can see, that once one has the estimated and reference instantaneous values of electromagnetic torque and stator flux, we proceed to calculate the error between them; these error are used as input for the hysteresis controllers. The output levels achieved in this stage of the control are input signals to the
