Research And Design Of Optimal Control System For Medical Centrifuge Based On IRMCF171

Medical centrifuge is a motor device for separation,concentration and purification of the mixture by high speed centrifugation,which is wi_dely used in medical devices,biomedical research and other fields.This article is aimed at the separation and purification of blood products,the purification of such substances do not have super high speed,but the requirements of strong anti-interference,process smooth and efficient,so that the purification of the material will meet the relevant standards.Therefore,it is very important to research the optimal control of the material.At present,there are some disadvantages: one is the driving motor of the anti-interference ability is weak and the technology of eliminating vibration is not mature,so the quality of centrifugal material will affect the steady operation of the motor;two is that running in full speed range is not up to the smooth and steady state operation.it needs high precision and high quality control system,to ensure the material to meet the design requirements after centrifugation.This paper constructs a vector control system of permanent magnet synchronous motor control based on i_d= 0.The control process of the method is simple,not only can the motor rotor flux and stator current decoupling control,and the permanent magnet synchronous motor has an advantage with small volume,reliable operation,high efficiency,convenient maintenance.So it suitable for systems with high precision and wi_de range and high dynamic performance control.In addition,in order to avoi_d some disadvantages when using a position sensor,and save the cost of production,this paper adopts control technology with position sensor-less,and the pulsating high frequency voltage injection method and sli_ding mode observer method of these two algorithms,to get the rotor position of motor.This paper adopts a hybri_d control method,which is the use of their respective advantages of the two methods together.When the motor is zero speed and low speed by the pulsating high frequency voltage injection method,high frequency signals through layers of filtering and decoupling to obtain the rotor position detection,and when it is high speed operation by sli_ding mode observer,vibration phenomenon in the process of there can restrain the chattering phenomenon using saturation function to ensure good dynamic motor.Their combination can achieve the goal of optimal control of the system.In terms of hardware design,this paper uses the IR Company specifically for the position sensor-less control and design of the IRMCF171.This is a pure hardware circuit based on the closed-loop motor control ASIC chip,which integrates motor MCE(Motion Control Engine)and 8051 kernel.It contains a variety of internal control algorithm modules,especially the position sensor-less control module,it is suitable for the design of hardware circuit used in this paper.In the MATLAB/Simulink environment the hybri_d model of the two methods are analyzed.The results show that the hybri_d control method can full speed range and stable operation.It can not only avoi_d the fluctuating high frequency voltage injection method phase deviation in high speed operation problems,and can effectively overcome the motor sli_ding mode observer appears the problem of poor accuracy.