The phase mapping method of a field inhomogeneity based on an Z axis pulse field gradient and polynomial fitting procedures of the axial shimming coil currents were described.
通过对Z轴磁场梯度和匀场线圈电流的多项式拟合，以获得磁场不均匀而引起的相位分布。
2
As the rotor moves, the back-EMF is acquired in each phase of the coil.
在转子的转动的同时获取在每相线圈的反电动势。
3
It observes that there is diametral temperature stairs to the coil and the main reason that the coherence occurs is due to the uneven shrink of the coil at the beginning of the cooling phase.