摘要:
针对大功率可调速型盘式磁力耦合器运行时，永磁体温度过高且易失效的问题，采用磁路法对导体转子的涡流损耗进行了理论推导,利用有限元软件对大功率高负载工况下的磁力耦合器永磁体稳态温度场进行了研究。研究结果表明，随着转差增大，磁力耦合器中的永磁体温度呈现出逐步增大的趋势；随着磁力耦合器气隙距离的减小，永磁体的最高温度逐步升高；当磁力耦合器的转差在180 r/min以下，气隙不小于18 mm时，其永磁体温度将保持在55 ℃以下，永磁体的最大磁能积和剩磁几乎不受影响，可保证磁力耦合器正常高效工作；当磁力耦合器处于大功率高负载工作状态下，气隙距离对永磁体的温度状态影响显著，当转差为180 r/min，气隙小于15 mm时，永磁体温度将急剧上升，当气隙减小至3 mm时，永磁体的实际最高温度将达到180 ℃以上，剩磁相比于室温下降接近20%，最大磁能积下降约45%。该研究成果对大功率磁力耦合器温度场研究具有一定的参考意义。
关键词:
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磁力耦合器
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永磁转子
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温度场
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气隙
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转差
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涡流损耗
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磁路法
Abstract:
In view of problems that temperature of permanent magnet is too high and easy to fail when disc-type speed-regulation magnetic coupler with high power is running, a magnetic circuit method was used to make theoretical derivation for eddy-current loss of conductor rotor, and finite element software was used to carry out research on steady-state temperature field for permanent magnet of magnetic coupler under condition of high power and high load. The research results show that with increasing of slip, temperature of the permanent magnet of the magnetic coupler increases; with decreasing of air gap distance of the magnetic coupler, the maximum temperature of the permanent magnet gradually rises. When slip of the magnetic coupler is in 180 r/min range, the air gap is no less than 18 mm, temperature of the permanent magnet will remain below 55 ℃,the maximum magnetic energy area and remanence of the permanent magnet are almost unaffected, and the normal and efficient operation of the magnetic coupler can be ensured. When the magnetic coupler is in working state of high power and high load, the air gap distance has a significant influence on the temperature state of the permanent magnet. When the slip is 180 r/min, the air gap is less than 15 mm, the temperature of the permanent magnet would rise sharply. When the air gap is reduced to 3 mm, the maximum temperature of the permanent magnet will reach over 180 ℃, and the magnetic remanence will be close to 20% compared with the room temperature, and the maximum energy product will decrease by about 45%. The research results have a guiding significant meaning for temperature field analysis of the high power magnetic coupler.
百度学术
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