数字式匝间检测仪检测盲区及风力发电机匝间短路分析

【目的】数字式匝间检测仪可为匝间绝缘检测提供直观的数据反馈,但实际检测过程中会出现检测显示匝间绝缘不合格但解剖线圈后无法找出绝缘问题或者检测显示合格但试验时匝间短路的情况,因此,急需排除检测干扰因素,提高检测结果的准确性。【方法】模拟了3种不同的线圈安装位置和2种不同的线圈安装状态来进行验证,并人为地制造线圈缺陷来测试设备的检测盲区。【结果】结果显示,圈式线圈安装位置和状态差异会导致数字式匝间绝缘检测仪的波形不重合度值升高,数字式匝间绝缘检测设备对人为制造的匝间绝缘缺陷无反馈。【结论】线圈附近的金属部件状态差异会对匝间波形不重合度值有很大影响,数字式匝间检测仪不能检测出未接触短路的匝间绝缘缺陷。通过对电机匝间绝缘事故原因进行分析,进一步证明了这一结论,验证结果对电机制造行业规避匝间绝缘缺陷具有积极作用。

电机线圈制造的流水化改革

从电机线圈产品的特点及当前的制造模式出发,考虑了悬挂式流水线的优点,提出了电机圈式线圈制造的流水化改革方案,并通过车间的实施,验证了其可行性,也为其它小型零部件的流水化生产模式提供了借鉴。

水轮发电机定子线圈VPI绝缘工艺探索

为满足市场需求,优化水轮发电机定子线圈绝缘工艺,从浸渍树脂选型、工艺试制、试验分析等方面对水轮发电机定子线圈单只VPI工艺进行研究。采用工艺对比试验分别制作样棒,进行工艺验证,制定并优化定子线圈单只VPI工艺流程。最后通过常态介质损耗正切及其增量试验和击穿试验,得出采用改良VPI工艺的线圈绝缘常态介质损耗及增量、击穿场强均能达到标准要求。

水轮发电机主接线的创新设计

在简要介绍传统水轮发电机定子主接线的基础上,结合实例介绍"首—尾","首—首"及"尾—尾"交替接线方法在水轮发电机定子圈式线圈主接线中的应用及其优点。

Optimal Design for Open MRI Superconducting Magnet with Active Shielding

The optimal design method for an open Magnetic Resonance Imaging （MRI） superconducting magnet with an active shielding configuration is proposed. Firstly, three pairs of current rings are employed as seed coils. By optimizing the homogeneity of Diameter Sphere Voltnne （DSV）, the positions and currents of the seed coils will be obtained. Secondly, according to the positions and currents of the seed coils, the current density of superconducting wires is determined, and then the original sections for the coils can be achieved. An optimization for the homogeneity based on the constrained nonlincar optimization method is employed to determine the coils with good homogeneity. Thirdly, the magnetic field generated by previous coils is set as the background field, then add two coils with reverse current, and optimize the stray field line of 5 Gauss in a certain scope. Finally, a further optimization for the homogeneity is used to get Final coils. This method can also be used in the design of other axisynmaetfic superconducting MRI magnets.