Translator Reconstruction to Improve Thrust Force in Non-Permanent-Magnet-Skewing Magnetic Screw

In this paper, a translator reconstruction design is proposed to improve thrust force of the non-permanent magnetic (PM) skewing magnetic screw. The number of segments and the skewing angle are the keys of the translator reconstruction design, which significantly affect the performance of the non-PM skewing magnetic screw. The axial and circumferential magnetic fields are respectively arranged on the stator and rotor of the non-PM skewing magnetic screw, effectively reducing machining difficulty. Then, the three-dimensional (3-D) magnetic field modulation theory is investigated to explain the operation principle, which is a fully and typically 3-D magnetic field modulation. Afterwards, the segmented design and optimization of skewing angle are conducted on the reconstruction translator, with the goal of improving thrust force. Besides, the modulation effect of different translators is investigated. Moreover, the circumferential gap is studied to further improve thrust force and the magnetic blocks are manufactured to ensure coaxiality, mechanical strength. Finally, the prototype is built to verify the performance of the non-PM skewing magnetic screw with reconstruction translator.