Research On The New Strategy Of Motor Circular Magnetic Field

More extensive platform for the constant improvement of the motor control has provided by deep research of the control theory,maturation of the simulation tools,rapid development of the micro-electronics and the computer technology.Modern motor control is constantly improving toward the direction of increasing performance,reducing the losses,reduction in cost and adapting to the system requirements.This article presents a new control strategy of motor circular magnetic field to adapt to the new requirements of the motor control and explore the new strategy to control the motor running.This article presents the structure of H-bridge,which is a new strategy with the control target of three-phase current,that is the principle of producing circular magnetic field in the motor air gap by three-phase symmetrical windings passing to the three-phase symmetrical current,and deduce the torque control strategy of PMSM by analyzing the general motor control strategy,including the advantages and disadvantages of the scalar control strategy,vector control strategy,direct torque control strategy and intelligent control strategy.This article achieves the control method with TI’s DSP chip TMS320F2812 as the core,introduces the characteristic of the chip,elaborates the circuitous philosophy of the each several part of module which includes determining the position of the rotor QEP circuit,A/D sampling circuit,detecting circuit of current,illustrate PID control algorithm and parameter tuning method.Oversampling technology is adopted to improve the accuracy of the three-phase current sampling,and determining the relationship of the sampling window and the sampling frequency.To complete the design of the servo system software in the CCS integrated development environment,which includes the main program of AD,the frame of sampling program and AD initialization program,and experiment waveform is given out,finally the experiment waveform is analyzed.The results show that the new control strategy in this article can satisfy the basic demand of high-performance servo control system.