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1、英文原文Research on Voltage Space-vector Control System of Synchronous MotorVector control of field oriented control, the basic idea is: through coordinate transformation control method for simulation of DC motor to control the permanent magnet synchronous motor. Three-phase symmetrical windings in thre
2、e-phase AC can produce a rotating magnetic motive force, two phase symmetrical windings into two symmetric alternating current can produce the same rotating magnet ometive force; therefore the three-phase symmetric winding can be replaced with two phase symmetrical windings equivalent independent of
3、 each other, equivalent principle is the constant magnetomotive force produced before and after transformation, transformation and total power constant.In oil field, the power factor was reduced and the reactive power consumption was increased because of the usage of the large number of asynchronous
4、 motor, and resulting in a huge waste of energy, which reduced the integrated cost-effective of field. The permanent magnet synchronous motor possess all the advantages of synchronous motor and it has high efficiency and higher power factor. For the advantages of permanent magnet synchronous,it will
5、 bring good energy saving results if it is used in pumping unit. As a result,the study on permanent magnet synchronous motor control system is important.In this paper the theory of vector control system on PMSM is first deeply studied,and the idea of coordinate transformation is used to build the ma
6、thematical model of PMSM. An in-depth theoretical analysis of voltage space vector control algorithm is done. Secondly,based on the mathematical model of permanent magnet synchronous motor and SVPWM theory,the model of PMSM vector control system is established by of Matlab/Simulink. The simulation r
7、esult shows the possibility of using the control system.In the paper, the software and hardware of PMSM vector control system is designed core-based TI Companys motor control DSP chip TMS320LF2407A. Hardware ncludes the main circuit,control circuit and its peripheral circuits;software contains the m
8、ain program and SVPWM interrupt subroutine,it achieves the implementation of the dual closed-loop current. At last,the motor experiments are carried on under the laboratory,the experimental results verify the correctness of the hardware and control program.Permanent magnet synchronous motor with the
9、 advantages of simple structure,high efficiency,wide speed range,widely used in machining,aerospace and electric traction fields,this paper introduces the structure,control strategy of permanent magnet synchronous motor and its vector torque control research present situation and direction.Based on
10、space vector principle,the three kind of coordinate systems as well as the transformation of them which usually used in motors speed control system are introduced,then,the mathematic models on different coordinate systems are derived,be based on that,the principle of traditional direct torque contro
11、l system as well as the direct torque control system based on SVPWM are analyzed detailed,meanwhile,the realization process of SVPWM algorithm is derived.Finally,the simulation model of convientional DTC Control system are established in MATLAB/Simulink.Control of permanent magnet synchronous motor
12、mainly in the following1.1 vector controlThe core idea of vector control of three-phase current,voltage,the flux of the motor by coordinate transformation into the rotor flux oriented phase reference coordinate system, control idea according to DC motor, control motor torque.The advantages of the fi
13、eld oriented vector control is good torque response,precise speed control,zero speed can achieve full load.However,the vector control system needs to determine the rotor flux,to coordinate transformation,a large amount of calculation,but also consider the effect of changes in the rotor of the motor
14、parameters,which makes the system more complex,this is the vector control deficiencies.1.2 direct torque controlIt is based on stator flux orientation,implementation of direct control of stator flux and torque.The control is based on the idea of amplitude real-time detection of motor torque and flux
15、 are given,and the torque and flux linkage value comparison,the torque and flux adjusting the appropriate stator voltage space vector selection table switch calculated directly from an offline,power switch and control of inverter state.Direct torque control does not need the vector coordinate transf
16、ormation complex,the motor model is simplified,no pulse width modulation signal generator,control has the advantages of simple structure,motor parameter changes,can obtain good dynamic performance.But there are also some shortcomings,such as the inverter switching frequency is not fixed,large torque ripple current to realize digital control requires high sampling frequency.1.3 direct torque control based on space vector modulation (SVM-DTC)The SVM-DTC control is the
