串聯(lián)磁路混合勵磁直線渦流制動器的研究
[Abstract]:Eddy Current Brake (ECB) is an electromagnetic device based on electromagnetic induction law and Lorentz force formula to generate brake force or brake torque. Compared with traditional brake device, ECB has the advantages of no contact between the primary and secondary, high reliability, convenient control, low noise, easy maintenance, long system life and no environmental impact. Therefore, ECB is widely used in braking, vibration suppression and transmission engineering. In this paper, based on the application of linear motor test platform, a new series magnetic circuit hybrid excitation linear ECB structure scheme is proposed. This work is of great significance to the development and production of linear motor test system. Firstly, the expression of air gap magnetic density amplitude is obtained by using the equivalent magnetic circuit model of hybrid excitation linear ECB with series magnetic circuit. In this paper, a piecewise function derived from the empirical formula is introduced to fit the air-gap magnetic density waveform, that is, the air-gap magnetic field amplitude and its waveform of the hybrid excitation line ECB can be obtained by combining the equivalent magnetic circuit model with the empirical fitting function. By solving the governing equations of each region and the boundary conditions between regions in the layered model, the expressions of eddy current amplitude and distribution, eddy current loss, braking force and normal force in the secondary conductor plate are derived, that is, the complete series magnetic circuit hybrid excitation is established. In order to improve the accuracy and applicability of the analytical model for linear ECB, the influence of initial and secondary core saturation on the analytical model is considered, and its accuracy is verified by two-dimensional finite element method. Secondly, the longitudinal end effect and transverse end effect of linear ECB are studied by analytical method. The influence of longitudinal dynamic end effect is analyzed by the theory of dimensional field, the influence of transverse static end effect is analyzed by Schucker transform, and the influence of transverse dynamic end effect is analyzed by the method of conductor plate partition. The validity and accuracy of the analytical model modified by linear ECB are validated by finite element method and experimental test respectively. The dynamic response of excitation current and braking force, as an important index to evaluate the dynamic performance of ECB, has a great influence on the stability and safe operation of linear motor test system. The variation trend of excitation current and dynamic response of brake force with electromagnetic parameters and its reasons are analyzed in detail, which provides a theoretical basis for its practical application in linear motor test platform. Thirdly, the design method of hybrid excitation linear ECB with series magnetic circuit is studied. Firstly, according to the practical application of ECB, the main design indexes are put forward, and the design principles that should be followed in the design are analyzed. Secondly, the main dimension equation of hybrid excitation linear ECB in series magnetic circuit is deduced by using analytical model. According to the influence of electromagnetic parameters on the braking force characteristics of ECB, the electromagnetic parameters such as pole distance, air gap length, conductor plate material and size, permanent magnet size, winding parameters and cogging size are selected step by step. A prototype of hybrid excitation linear ECB with series magnetic circuit is developed, and a braking force test platform is set up to test the braking performance of hybrid excitation linear ECB with series magnetic circuit. According to the distribution of air flow field around the hybrid excitation linear ECB, the convective heat transfer coefficients and the convective heat resistance of each heat dissipation surface of the ECB are calculated by the non-dimensional analysis method. In order to verify the accuracy of the thermal network model, the finite element model is used to calculate the temperature variation of the hybrid excitation linear ECB with series magnetic circuit over time.The static and dynamic temperature rise characteristics of the hybrid excitation linear ECB prototype with series magnetic circuit are tested to verify the accuracy and validity of the thermal network model and the finite element model.
【學(xué)位授予單位】:哈爾濱工業(yè)大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2017
【分類號】:TM359.4
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