本文選題：永磁同步電機　切入點：溫度場　出處：《湘潭大學》2017年碩士論文

【摘要】：由于永磁同步電機具有體積小、質(zhì)量輕、功率密度高、形狀和尺寸靈活多樣等一系列優(yōu)點,使其得到了廣泛應(yīng)用。隨著工業(yè)技術(shù)發(fā)展,永磁電機的單機容量不斷增加,內(nèi)部損耗也隨其增加,致使電機內(nèi)部溫升越來越高,直接影響電機的可靠運行。因此,對于電機溫度場的分析計算及電機冷卻系統(tǒng)的設(shè)計研究尤為重要。本文主要用不同的溫度場分析方法對不同冷卻方式的兩款永磁同步電機進行溫度場分析,實現(xiàn)對不同冷卻形式的永磁同步電機溫度場的精確分析,并針對不同實際情況選擇最為合適的溫度場計算方法。首先,以320kW自然冷卻永磁同步發(fā)電機為例,用公式計算法和Ansoft Maxwell軟件分析法對永磁同步電機的損耗進行分析計算,得到電機的損耗分布情況,尤其是針對永磁體渦流損耗的分析計算�；趥鳠釋W的基本理論,采用FEM對樣機進行溫度場分析,用ANSYS Workbench軟件對樣機電磁場、溫度場進行耦合分析,得到樣機溫度場的分布情況。并通過對有無渦流損耗影響的樣機溫度場分布情況進行對比分析,驗證永磁體渦流損耗的重要性。其次,采用LPTN對樣機進行溫度場分析,根據(jù)電機各部位散熱路徑設(shè)置節(jié)點,建立能反映電機整體傳熱情況的熱網(wǎng)絡(luò)結(jié)構(gòu),由熱傳導和熱對流計算公式計算各節(jié)點熱阻,通過MATLAB編寫熱平衡方程計算程序,計算電機內(nèi)部各節(jié)點的溫度。對樣機進行溫升測試,通過對FEM、LPTN和溫升測試的結(jié)果進行對比可知,在誤差允許范圍內(nèi),LPTN和FEM的計算結(jié)果均正確。最后,以100kW水冷永磁同步電動機為例,對其水冷系統(tǒng)進行分析設(shè)計。為了解決傳統(tǒng)冷卻結(jié)構(gòu)在電機長期運行過程中容易出現(xiàn)漏液和散熱不均的問題,提出一種新型冷卻結(jié)構(gòu)。以傳熱學和流體力學基本理論為基礎(chǔ),計算樣機損耗發(fā)熱和散熱處于平衡狀態(tài)時的水流量和流速。用CFD方法分析冷卻介質(zhì)的流動特性,并對樣機進行流場和溫度場耦合分析,得到樣機的溫度場分布情況。通過對比有無冷卻結(jié)構(gòu)樣機溫度場分布情況,驗證水冷結(jié)構(gòu)設(shè)計的合理性及實用性。
[Abstract]:Permanent magnet synchronous motor (PMSM) has been widely used because of its advantages of small size, light weight, high power density, flexible shape and size, etc. With the development of industrial technology, the single machine capacity of PMSM has been increasing. With the increase of internal loss, the internal temperature rise of the motor becomes higher and higher, which directly affects the reliable operation of the motor. It is very important to analyze and calculate the temperature field of the motor and to design the cooling system of the motor. In this paper, the temperature field of two permanent magnet synchronous motors with different cooling modes is analyzed with different temperature field analysis methods. The temperature field of permanent magnet synchronous motor (PMSM) with different cooling forms is analyzed accurately, and the most suitable temperature field calculation method is chosen according to different actual conditions. Firstly, taking 320kW natural cooling PMSG as an example, The loss distribution of permanent magnet synchronous motor (PMSM) is analyzed and calculated by formula calculation method and Ansoft Maxwell software analysis method, and the loss distribution of PMSM is obtained, especially for the analysis and calculation of eddy current loss of permanent magnet. Based on the basic theory of heat transfer, The temperature field of the prototype is analyzed by FEM, and the electromagnetic field and temperature field of the prototype are analyzed by ANSYS Workbench software. The distribution of the temperature field of the prototype is obtained, and the importance of the eddy current loss of the permanent magnet is verified by comparing and analyzing the temperature field distribution of the prototype with or without eddy current loss. Secondly, the temperature field of the prototype is analyzed by LPTN. According to the heat dissipation path of the motor, the node is set up, and the heat network structure reflecting the whole heat transfer of the motor is established. The thermal resistance of each node is calculated by the formula of heat conduction and heat convection, and the calculation program of heat balance equation is compiled by MATLAB. The temperature of each node inside the motor is calculated. The temperature rise test of the prototype is carried out. By comparing the results of the FEM-LPTN and the temperature rise test, it can be seen that the calculation results of both the LPTN and the FEM are correct within the range of errors permitted. Finally, Taking 100kW water-cooled permanent magnet synchronous motor as an example, the water cooling system is analyzed and designed. A new cooling structure is proposed. Based on the basic theories of heat transfer and hydrodynamics, the flow rate and velocity of water are calculated when the heat dissipation and heat dissipation are in equilibrium. The flow characteristics of cooling medium are analyzed by CFD method. The temperature field distribution of the prototype is obtained by the coupled analysis of the flow field and the temperature field, and the rationality and practicability of the water-cooled structure design are verified by comparing the temperature field distribution of the prototype with or without cooling structure.
【學位授予單位】：湘潭大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM341

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