Research For Pmsm Based On Dead Beat Control

Vector control is widely used in the permanent magnet synchronous motor,however,as the main control module,PID regulator control can not meet the requirements of the system,which needs higher speed with modern industry's high requirement of quality control.Comparing with the PI regulator control and other digital control,Dead Beat Current Control(DBCC)has the advantages of faster dynamic response,and DBCC can make the motor quickly return to normal working condition when switching state or interference occurs.The basic idea of DBCC is that according to the state equation of PMSM,the feedback signal and the reference value needed,the current or voltage number of the next switching period can be calculated,then combined with SVPWM,the pulse width of the next switching period will be get to control current accurately.A novel DBCC is proposed to replace the PI regulator control in this paper,and ARM(STM32)is used to be the main chip,which is the most popular chip nowadays,its high speed calculation can realize the full digital control.A novel DBCC which is a new kind of digital control method considering the time delay is proposed in this paper,based on the state equation of permanent magnet synchronous motor,dispersed the integral equation respectively twice in particular period,and predicted voltage or current variables of two switching periods will be get finally,and it can reach a new balanced state in two switch cycles.However considering the inductance parameters of permanent magnet synchronous motor,noise and nonlinear factors,experimental results can reach a new balanced state in three switch cycles,explaining that inductance parameter has certain influence on dynamic response;the comparison among three methods of Td compensation,feedforward compensation and the voltage loop compensation for dead time is also presented,through the comparison and THD analysis,waveform compensation is improved,significantly lower THD analysis values,and it also reduces the dead time effect to the system,thus reducing the ripple effect of the system,and it makes very important researching sense.This article main researches two parts of the Dead Beat Current Control and dead time compensation,and researching in two parts of the hardware design and software design in this paper explains the design of the experimental platform and the realization of the theory,and the experimental results verify Dead Beat Current Control's dynamic response and the advantages of dead time compensation's effects.