Characteristics Study Of Permanent Magnet Linear Synchronous Motor Supplied By SPWM Voltage Source

As the rapid development of permanent magnetic materials, power electronics technology and microelectronic technology, the integrated system is favored by the great majority of scholars, which consists of the sinusoidal pulse width modulation voltage source inverter (SPWM-VI) composed with switch arrays and the permanent magnet linear synchronous motor (PMLSM) with high efficiency and energy-saving, simple structure, reliability and thrust density. It attaches much importance to the research of the characteristics of PMLSM whose features are non-sinusoidal power supply, low frequency, limited itinerary, and entry and exit effect, cut cores, half-filled end section and so on.The main target of this dissertation is the horizontal transport system driven by SPWM-VI-powered single primary PMLSM (SPPMLSM) and the ropeless vertical transport system driven by the non-continuous primary PMLSM (DPPMLSM).This dissertation proposes a fast, high-precious analysis-finite-element mixed method for SPPMLSM magnetic field, set up a partitioned model of SPPMLSM, deduce the analytic general solution of air space of SPPMLSM and secondary regional magnetic field, put up with the finite-element formula of primary spline region, combine the analytic general formula with the matrix equation of primary spline region by using the interface of primary surface and air space to get the whole matrix formula of analytic-finite-element mixed method, calculate the magnet distribution between the primary surface of the sample and the midline of air space with the analytic-finite-element mixed method and single-finite-element method, respectively. With concrete calculation, it is very promising that the analytic-finite-element mixed method for magnet field solution show that the analysis is fast and the finite-element method is highly precious and versatile for the complicated marginal conditions.Characteristics of the end region of SPPMLSM detent force is researched employing the finite-element method incorporated with indirect method, and that Fourier analysis method is not available is found out when at the entry and the outer, the detent force in the end region of half-infinite long primary PMLSM do not meet the periodicity. Then the dissertation goes to the relation between the detent force in the end region and the length of permanent magnet and primary core, come up with the efficient solution to reduce the detent force of the end region by altering the shape of tooth-slot component on the end of the primary core and analyze the effect and rule of tooth-slot component of the detent force under by using this solution, deduce the approximate analysis formula with the function approximating the end region of the SPPMLSM detent force by cubic B-spline function. And in the primary and secondary absolute coupling areas of SPPMLSM, the trigonometric polynomial as minimum square approximation is taken, and the analytic model of the detent force of the end region is worked out in the primary and secondary absolute coupling areas, then the periodicity of the waveform of the detent force and all the elements of the detent force and amplitude by the analysis of all the elements of the detent force of DPPMLSM is elicited with the combination of the method of superposition and method of finite-element. As the relative position of secondary mover changes, that the multi-end primary detent force approach to sine is found, and is simply perturbed by the non-continuous primary in the short-time, which cast the practical meaning for the analysis of the capability of DPPMLSM and optimizing the design.For the building-up of nonlinear model of SPWM-VI-PMLSM, firstly, the mathematic model of SPWM-VI by the harmonic analysis is set up and the simulate model of SPWM-VI's SIMULINK is put up, secondly, the mathematic model of SPWM-VI-SPPMLSM is established with state variable by time-stepping finite element method considering the impedance of the end of motor. As result, the precision of two-dimension magnet field is improved and the three-phase winding flux linkage data of PMLSM is collected as the sample datum. In the course of putting up the primary and secondary absolute coupling model, the flux linkage is fit the curve based on the partial derivative of the current and location of mover and lead to the analytic formula of flux linkage, so the equations of state space are accomplished. At the outer and entry zone, the flux linkage as the sample data of supporting vector machine regression function approximation set up the state phasor mathematic model of the nonlinear SPWM-VI-SPPMLSM.The dissertation goes to the research of stability and dynamism of SPPMLSM supplied by SPWM voltage source inverter, comparative researching the stability of SPPMLSM powered by the sinusoidal voltage source and SPWM-VI respectively and the stability of SPPMLSM on different carrier frequency, in-depth studying the stability of SPPMLSM on different load condition, using the load angle to analyze the relationship between the load angle and the volume of the load on SPPMLSM, inspecting the cause of oscillation of the steady velocity, pointing out that the end region-component of the detent force of SPPMLSM play the main part in the mover steady velocity oscillation, and construing the characteristic of low speed interfered by the winding resistance of SPPMLSM . Then the research results of the dynamic charactersitics of load suddenly changing are shown that the bigger the numerical value is, the shorter time the system runs stably, the softer the speed fluctuation of shock load is, and given that shock load is less than the maximum of rated load. When uninstall the load, the system is easily to go to low-stability.The dissertation builds up the nonlinear model of SPPMLSM whose state variable is composed with nonlinear flux linkage, analyzing the structure of SPPMLSM and the designating rule of intersegment interval, forming the space state equations of SPPMLSM, and the emulate model with SIMULINK. Lastly, the dissertation testifies the validity and precision of the models by comparing the simulated data and the experimental results, working over the conditions like the uplink electric of SPPMLSM and the power generation regeneration baking by downlink reverse connect. The dissertation gives the systematic research on the feature of braking operation of DPPMLSM when lose power, studied the blackout protection of vertical hoisting system of DPPMLSM with the combination of finite-element method and the energy analytic-formula of motion system, analyzed the emulate and trial curve when every primary winding is short circuited after the blackout of DPPMLSM ,found out the steady falling-down speed of hoister lossing power which is related with the resistance value of external resistance and the relation between external resistance and the protection breaking performance of DPPMLSM when in power off. And the motor speed change greatly in the transition of primary switch, and has bad effect on the steady operation of the electrical generation braking of the system. The dissertation also generalizes the reason and the feature of speed mutation of mover.Experimental research is focused on the characterstics of PMLSM such as specific structure and limited displsce in low-frequency operation condition, and a new way to measure the no-load electromotive force of PMLSM is proposed, the collecting and dealing with the datum of the horizontal transportation system are finished driven by SPPMLSM and the vertical ropeless hoisting system driven by DPPMLSM, which are detected by the person computer, the validity of the theory and the efficiency and practicality of the established models is demonstrated.