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An ambient field AIDS the magnetization from the exciting current.
背景场加强了激励电流的磁化强度。
Benefiting from the absence of the exciting current and the excitation loss, the efficiency and the power density have increased.
又因无需励磁电流，省去了励磁损耗，提高了电机的效率和功率密度。
The optimum design was realized associated with the relationship among coil turns, exciting current and electromagnetic attraction force.
结合线圈圈数、激励电流与电磁吸力之间的关系，完成了电磁系统的优化设计。
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