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对永磁耦合器涡流损耗功率进行了分析,根据电磁感应及能量守恒定律得到涡流损耗与其影响因素的关系,通过有限元仿真分析了稳定运行及过载状态下永磁耦合器的温升情况。结果表明,在相同负载的条件下,气隙厚度增加、导体盘电阻率增大、铜盘厚度减小都会导致涡流损耗增加;对于40 kW矿用永磁耦合器,使用自然风冷方式可以满足300 N·m以内负载的散热要求;过载情况下,永磁耦合器的永磁体会在45 s内达到居里温度并造成永久损坏,应及时关闭电机。
The eddy current loss power of permanent magnet coupler is analyzed. The relationship between eddy current loss and its influencing factors is obtained according to the law of electromagnetic induction and energy conservation. The temperature rise of permanent magnet coupler under steady operation and overload condition is analyzed by finite element simulation. The results show that under the same load conditions, the air gap thickness increases, the resistivity of the conductor plate increases, and the thickness of the copper plate decreases. As a result, the eddy current loss increases. For the 40 kW permanent magnet coupler, 300 N · m within the heat load requirements; overload case, permanent magnet coupling permanent magnet will reach the Curie temperature within 45 s and cause permanent damage, the motor should be shut down in time.