在主动式磁回热制冷机中,由于温跨变化、磁场分布不对称、磁回热器和永磁体气隙长度不一致、磁回热器间相位的影响,采用热力学方法来计算磁功耗会产生较大的误差.本文依据经典分子场理论,建立了通过计算磁力来估算磁功耗的方法,采用该方法可以对磁回热器和永磁体气隙长度比(δ),以及磁回热器之间相位差进行分析和优化设计.分析结果表明,磁回热器温跨的增大会使磁力峰值和消耗磁功率增大,当δ在0到1的范围变化时,磁力峰值和磁功率均存在极大值;当右侧回热器相位超前左侧回热器π时,消耗的磁功率最小,且随着温跨的增加,对应最小磁功率的相位差增大.
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