| The linear driver device is an important equipment in the pulse pulsating flow experiment and supplies the extracorporeal circulation with the impetus and the cell culture with quasi-physiology flow. In current, the linear driver in pulsating flow experiment is the linear motor providing the linear force, simplifying the complex mechanism structure which uses the rotating motor appending the conversion device and improving the efficiency of the mechanic transmission. Because the physiological environment is very complex and the study of the cell physiologic and pathologic phenomena still lies to the extracorporeal cell segregation and culture, the. capability of the pulse pulsating flow experiment device is important to establish the extracorporeal physiology circulation.The purpose to this paper is to design a kind of linear motor with large force driving the pulse pulsating flow experiment,and supplying the fluid field with enough pressure for extracorporeal cells.linear motor have many category. this paper is to study the voice coil permanent magic linear motor, this kind of motor applies the advance production in current rare earth permanent magic materials and electronic control technique. It has many marked advantages such as small cubage, large specific power, high efficiency, energy saving, stationarity and firmness. The former linear motor cannot provide the better force so that the pressure of the fluid in the pulsating flow experiment rose enough, so designing the motor structure and high effective power driver reasonably is the key technique in designing the linear motor.This paper researches on these subjects below:(l)This thesis analyzed the current literatures and linear motors' actuality and development.the current designing methods of the linear motor, the current an developing optimized designing of the motor were especially reviewed.(2)In order to improve the density of magnetic field, this paper varied the structure of the motor and seek the best structure. Because of the cost, the experiment tested by designing different structures of the motor cannot be accepted. So, this paper applied the ANSYS the finite element method by ANSYS to simulate the varied motors. By the result, this paper was to select the best structure to design.(3) After selecting the structure of the motor, this paper research the optimization of this mode's motor, and indicated the theory and method of the optimized designing. It also established optimized projects for two modes' motor in practice and analyzed the result of the optimized designing.(4) The dynamical response is the important capability of the linear motor. This paper using the ANSYS, simulated the voltage-force response and display the force sent out by motor had a period deferment.(5) Motors'power amplification also is the important factor that influenced the motor's force. Improving the drive voltage and current can improving the force further. The former power amplifying circuit amplified the signal depending on the linear amplificatory circuit. Its efficiency is lower and the calorific value is large and cannot send out strong current.Also, its precision was low. This paper improved the former circuit, used PWM power amplificatory circuit and the motor's capability rose clearly.(6) The result of the simulating needs to be proved by experiment. This paper created the platform to test the motor. The motor's largest continuous force can be tested by the JINDAO equipment. On the side, this paper established the displace platform to test the dynamical response of the process in motor's start-up period and analyzed the motor factors such as displacement, velocity, acceleration, voltage, current, resistance,power and the density of magnetic field. At the same time, it proved power amplification circuit had superior capability. Finally, this paper analyzed the insufficiency in this paper, and pointed out the direction of the research. |
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