旋转恒定磁场
Rotating and stationary magnetic field
rotary constant-strength magnetic field
Rotary constant magnetic field
旋转恒定磁场RPMF
rotating permanent-magnetic field RPMF
固定旋转辊
fixed the rotating roller
假定旋转坐标法
hypothetical rotate frame strategy
稳定旋转轴
permanent axis of rotation