多极轴向磁路磁阻式旋转变压器的分析与优化

针对单对极轴向磁场磁阻式旋转变压器测量误差相对较大的问题,提出了一种多极轴向磁路磁阻式旋转变压器,以解决高次谐波的干扰、定子与转子偏心等问题对精度的影响.应用微积分法对这种新式磁阻式旋转变压器的数学模型进行解析计算,并在此基础上给出了多极轴向磁路旋转变压器的数学模型和工作原理.通过有限元法的分析,验证了设计方案的正确性与可行性.分析结果表明,输出电势中的高次谐波使电压波形畸变而产生误差,其中三次谐波含有率占总谐波畸变率的比重较大.通过对转子结构进行优化,削弱了输出电势中的三次谐波,有效地降低了多极轴向磁路磁阻式旋转变压器的测量误差.

Finite element analysis and structure optimization of the multipole axial flux reluctance resolver

According to relatively large measurement error of one pair pole axial-flux resistance resolver, a multipole axial-flux reluctance resolver is put forward, which could solve the problem of the high-order harmonic interference and the influence of stator eccentricity and rotor eccentricity on precision. By using calculus method, the mathematics model of this new reluctance resolver is calculated. The validity and feasibility of design proposal are tested by finite element analysis. The analysis results show that the high order harmonic of output voltage makes voltage waveform distortion and causes errors, in which the third harmonic ratio accounts for a large proportion of total harmonic distortion rate. By optimizing the rotor structure, the third harmonic of output voltage is weakended so that the measurement error of the multipole axial-flux reluctance resolver is effectively reduced.