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In order to improve the thermal conductivity and environmental resistance of motor insulation system, we analyzed the conventional properties, heat resistance, thermal conductivity, and environmental resistance of a high thermal conductive and high temperature resistant epoxy encapsulating resin. A prototype was made, and the application performance of the epoxy encapsulating resin in low voltage motor was tested. The results show that the epoxy encapsulating resin has excellent mechanical and electrical properties, excellent low temperature and thermal shock resistance, and good compatibility with enameled wire, and the thermal conductivity and temperature index reach 1.18 W/(m·K) and 187.5℃, respectively. The application of high thermal conductive insulating resin could effectively improve the thermal conductivity of the motor insulation system, under the same conditions, the temperature rise of motor decreases by 20.7℃ compared to the motor with ordinary high temperature resistant insulating varnish. At the same time, compared with the vacuum pressure impregnation process, the insulation system of the motor made by the vacuum encapsulation process has better integrity, electrical properties, and humidity resistance, and the disadvantage of low paint hanging at the groove is avoided.
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为提高电机绝缘结构的导热性能和耐环境性能,本研究针对某高导热耐高温环氧灌封树脂的常规性能、耐热性能、导热性能及耐环境性能等进行了分析,并制作样机,对其在低压电机上的应用性能进行测试。结果表明:该高导热环氧灌封树脂具有优异的力学性能和电气性能,导热系数为1.18 W/(m·K),温度指数达到187.5℃,具有优异的耐低温及冷热冲击性能,且与漆包线具有良好的相容性。高导热绝缘树脂的应用可有效提升电机绝缘系统的导热性能,在相同条件下使电机温升比使用普通耐高温绝缘漆的电机下降了20.7℃。同时,相对于真空压力浸漆工艺,通过真空灌封工艺制作的电机绝缘结构整体性更优,且避免了槽口挂漆量较低的缺点,具有更优的电气性能和防潮性能。
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刘冠芳(1983-),女(汉族),河南灵宝人,高级工程师,主要从事电机绝缘系统设计的研究。
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史开华(1988-),男(汉族),山东滨州人,高级工程师,博士,主要从事电机绝缘结构设计的研究;
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刘冠芳(1983-),女(汉族),河南灵宝人,高级工程师,主要从事电机绝缘系统设计的研究。
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刘冠芳(1983-),女(汉族),河南灵宝人,高级工程师,主要从事电机绝缘系统设计的研究。
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2006., articleTitle=null, refAbstract=null)], funds=null, companyList=[AuthorCompany(id=1222974140903051397, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, xref=null, ext=[AuthorCompanyExt(id=1222974140907245702, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, companyId=1222974140903051397, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=CRRC YongJi Electric Co., Ltd., Xi'an 710016, China), AuthorCompanyExt(id=1222974140915634311, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, companyId=1222974140903051397, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=中车永济电机有限公司,陕西 西安 710016)])], figs=[ArticleFig(id=1222974143537074488, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=EN, label=Fig.1, caption=
Appearance of the asynchronous motor after insulating treatment, figureFileSmall=Kz0UQIlVEh3K260bN4JTgA==, figureFileBig=oJ2f6bAqpTNSANjHaZObRw==, tableContent=null), ArticleFig(id=1222974143599989055, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=CN, label=图1, caption=
异步电动机绝缘处理后外观图, figureFileSmall=Kz0UQIlVEh3K260bN4JTgA==, figureFileBig=oJ2f6bAqpTNSANjHaZObRw==, tableContent=null), ArticleFig(id=1222974143700652354, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=EN, label=Fig.2, caption=
Heat resistance of the epoxy casting resin, figureFileSmall=cGusJVJvSROF+6c1sZsVfQ==, figureFileBig=aHgN467xR41s/2L79izrqw==, tableContent=null), ArticleFig(id=1222974143805509959, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=CN, label=图2, caption=
环氧灌封树脂耐热性, figureFileSmall=cGusJVJvSROF+6c1sZsVfQ==, figureFileBig=aHgN467xR41s/2L79izrqw==, tableContent=null), ArticleFig(id=1222974145122521422, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=EN, label=Fig.3, caption=
Appearance of the epoxy casting resin after low-temperature cold and thermal shock tests, figureFileSmall=ziSYiZAcKhtD/umP5qsZpw==, figureFileBig=Vb3qk88t7jPXnoY/AyntpQ==, tableContent=null), ArticleFig(id=1222974145235767634, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=CN, label=图3, caption=
环氧灌封树脂低温及冷热冲击试验后外观, figureFileSmall=ziSYiZAcKhtD/umP5qsZpw==, figureFileBig=Vb3qk88t7jPXnoY/AyntpQ==, tableContent=null), ArticleFig(id=1222974145323848024, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=EN, label=Fig.4, caption=
Breakdown voltage of the varnished wire before and after soaking the epoxy casting resin, figureFileSmall=SfIDXA3D59aqrtULEyIZvg==, figureFileBig=pP09t8ttHIaWepRN+5yF4A==, tableContent=null), ArticleFig(id=1222974145420317021, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=CN, label=图4, caption=
漆包线浸泡环氧灌封树脂前后的击穿电压, figureFileSmall=SfIDXA3D59aqrtULEyIZvg==, figureFileBig=pP09t8ttHIaWepRN+5yF4A==, tableContent=null), ArticleFig(id=1222974145504203103, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=EN, label=Fig.5, caption=
Temperature rise of the asynchronous motor winding, figureFileSmall=jcavyA0HpjaALmsGm8+Bhg==, figureFileBig=xLp1LOJ6sNHpp455p2IGnw==, tableContent=null), ArticleFig(id=1222974145592283489, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=CN, label=图5, caption=
异步电动机定子绕组温升, figureFileSmall=jcavyA0HpjaALmsGm8+Bhg==, figureFileBig=xLp1LOJ6sNHpp455p2IGnw==, tableContent=null), ArticleFig(id=1222974145688752484, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=EN, label=Fig.6, caption=
Dielectric loss factor of the asynchronous motor, figureFileSmall=DSR5//zE3Y0rq4ZH0+OSBg==, figureFileBig=FtFmREm34CNPZF/Ga0vEQw==, tableContent=null), ArticleFig(id=1222974145789415784, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=CN, label=图6, caption=
异步电动机定子介质损耗因数, figureFileSmall=DSR5//zE3Y0rq4ZH0+OSBg==, figureFileBig=FtFmREm34CNPZF/Ga0vEQw==, tableContent=null), ArticleFig(id=1222974145843941740, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=EN, label=Fig.7, caption=
Partial discharge voltage of the asynchronous motor, figureFileSmall=XWWikQ7EC38aFUdOeAZoFA==, figureFileBig=qmgffAQiJUikvqgDC3ro0A==, tableContent=null), ArticleFig(id=1222974145902661998, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=CN, label=图7, caption=
异步电动机定子的局部放电电压, figureFileSmall=XWWikQ7EC38aFUdOeAZoFA==, figureFileBig=qmgffAQiJUikvqgDC3ro0A==, tableContent=null), ArticleFig(id=1222974145978159474, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=EN, label=Fig.8, caption=
Immersion insulation resistance of the motor B as function of immersion time, figureFileSmall=tLc+YMyF3Cml35QbO4jKtg==, figureFileBig=NEzdU4gmmPQjKoOJ/pizEA==, tableContent=null), ArticleFig(id=1222974146053656950, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=CN, label=图8, caption=
电机B浸水绝缘电阻随浸水时间的变化趋势, figureFileSmall=tLc+YMyF3Cml35QbO4jKtg==, figureFileBig=NEzdU4gmmPQjKoOJ/pizEA==, tableContent=null), ArticleFig(id=1222974146124960123, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=EN, label=Tab.1, caption=
Comparison of the insulation process, figureFileSmall=null, figureFileBig=null, tableContent=
| 技术参数 | 电机A(原结构) | 电机B |
|---|
绝缘 树脂 | 指标 | 环氧改性不饱和聚酯亚胺浸渍漆 | 高导热耐高温环氧灌封树脂 |
| 耐热等级 | H级 | H级 |
导热系数 /(W/(m·K)) | 0.21 | 1.18 |
| 绝缘工艺 | 真空压力浸漆(VPI) | 真空灌封 |
), ArticleFig(id=1222974146204651901, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=CN, label=表1, caption=
对地绝缘处理工艺对比
, figureFileSmall=null, figureFileBig=null, tableContent=
| 技术参数 | 电机A(原结构) | 电机B |
|---|
绝缘 树脂 | 指标 | 环氧改性不饱和聚酯亚胺浸渍漆 | 高导热耐高温环氧灌封树脂 |
| 耐热等级 | H级 | H级 |
导热系数 /(W/(m·K)) | 0.21 | 1.18 |
| 绝缘工艺 | 真空压力浸漆(VPI) | 真空灌封 |
), ArticleFig(id=1222974146301120898, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=EN, label=Tab.2, caption=
General performance of the epoxy casting resin, figureFileSmall=null, figureFileBig=null, tableContent=
| 检测项目 | 指标值 | 实测值 |
|---|
| 外观 | 灰色不透明黏稠状液体 | 灰色不透明黏稠状液体 |
黏度((60±0.5)℃,旋转黏度计) /(mPa·s) | 3 000~5 000 | 3 750 |
| 凝胶时间((120±1)℃,试管法,13 g)/min | 15~25 | 22 |
| 拉伸强度/MPa | 常态 | ≥30 | 45.5 |
| 弯曲强度/MPa | 常态 | ≥60 | 119.5 |
| 冲击强度/(kJ/m2) | 常态 | ≥3 | 3.7 |
电气强度 /(kV/mm) | 常态 | ≥22 | 24.8 |
| 浸水24 h | ≥20 | 23.2 |
| 介质损耗因数/% | 常态 | ≤1.5 | 1.01 |
| 浸水24 h | ≤2.0 | 1.27 |
体积电阻率 /(Ω·m) | 常态 | ≥1.0×1014 | 3.8×1014 |
| 浸水24 h | ≥1.0×1013 | 4.0×1014 |
| 吸水率/% | 25℃/7 d | ≤0.1 | 0.07 |
| 100℃/2 h | ≤0.1 | 0.02 |
| 导热系数/(W/(m·K)) | ≥1.0 | 1.18 |
), ArticleFig(id=1222974146414367113, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=CN, label=表2, caption=
环氧灌封树脂(混合后)的常规性能
, figureFileSmall=null, figureFileBig=null, tableContent=
| 检测项目 | 指标值 | 实测值 |
|---|
| 外观 | 灰色不透明黏稠状液体 | 灰色不透明黏稠状液体 |
黏度((60±0.5)℃,旋转黏度计) /(mPa·s) | 3 000~5 000 | 3 750 |
| 凝胶时间((120±1)℃,试管法,13 g)/min | 15~25 | 22 |
| 拉伸强度/MPa | 常态 | ≥30 | 45.5 |
| 弯曲强度/MPa | 常态 | ≥60 | 119.5 |
| 冲击强度/(kJ/m2) | 常态 | ≥3 | 3.7 |
电气强度 /(kV/mm) | 常态 | ≥22 | 24.8 |
| 浸水24 h | ≥20 | 23.2 |
| 介质损耗因数/% | 常态 | ≤1.5 | 1.01 |
| 浸水24 h | ≤2.0 | 1.27 |
体积电阻率 /(Ω·m) | 常态 | ≥1.0×1014 | 3.8×1014 |
| 浸水24 h | ≥1.0×1013 | 4.0×1014 |
| 吸水率/% | 25℃/7 d | ≤0.1 | 0.07 |
| 100℃/2 h | ≤0.1 | 0.02 |
| 导热系数/(W/(m·K)) | ≥1.0 | 1.18 |
), ArticleFig(id=1222974146519224715, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=EN, label=Tab.3, caption=
Thermal oxygen ageing life of the epoxy casting resin at different temperature, figureFileSmall=null, figureFileBig=null, tableContent=
| 老化温度/℃ | 热氧老化寿命/h |
|---|
| 220 | 2 048 |
| 240 | 603 |
| 260 | 183 |
), ArticleFig(id=1222974146577944977, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=CN, label=表3, caption=
环氧灌封树脂在不同温度下的热氧老化寿命
, figureFileSmall=null, figureFileBig=null, tableContent=
| 老化温度/℃ | 热氧老化寿命/h |
|---|
| 220 | 2 048 |
| 240 | 603 |
| 260 | 183 |
), ArticleFig(id=1222974146670219667, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=EN, label=Tab.4, caption=
Low temperature resistance and cold and thermal shock resistance of the epoxy casting resin, figureFileSmall=null, figureFileBig=null, tableContent=
| 试验项目 | 试样条件 | 试验结果 |
|---|
耐低温 (-45℃/96 h) | 加熔敷导线固化的厚层 | 不开裂 |
| 加M10螺母固化的厚层 | 不开裂 |
| 加漆包线固化的厚层 | 不开裂 |
耐冷热冲击 (-45℃/0.5 h+155℃/0.5 h, 100周期) | 加熔敷导线固化的厚层 | 不开裂 |
| 加M10螺母固化的厚层 | 不开裂 |
| 加漆包线固化的厚层 | 不开裂 |
), ArticleFig(id=1222974146766688664, tenantId=1146029695717560320, journalId=1149653034449285133, articleId=1222482829406097919, language=CN, label=表4, caption=
环氧灌封树脂耐低温及冷热冲击性能
, figureFileSmall=null, figureFileBig=null, tableContent=
| 试验项目 | 试样条件 | 试验结果 |
|---|
耐低温 (-45℃/96 h) | 加熔敷导线固化的厚层 | 不开裂 |
| 加M10螺母固化的厚层 | 不开裂 |
| 加漆包线固化的厚层 | 不开裂 |
耐冷热冲击 (-45℃/0.5 h+155℃/0.5 h, 100周期) | 加熔敷导线固化的厚层 | 不开裂 |
| 加M10螺母固化的厚层 | 不开裂 |
| 加漆包线固化的厚层 | 不开裂 |
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