Three-Dimensional Analysis and Experimental Verification of a Novel Magnetic Lead Screw With Checkerboard Array Magnetic Pole

In this article, a novel checkerboard array pole (CAP) magnetic lead screw (MLS) is proposed. Compared with the traditional MLS, the proposed CAP-MLS can not only save permanent magnet (PM) consumption but also provide enough thrust for application. To save PM consumption, PM and iron teeth are alternately mounted to form a circle of helical magnetic poles on the mover of the proposed CAP-MLS. Meanwhile, the traditional pure PM helical poles are mounted on the rotor to increase the maximum thrust and torque. On the other hand, a 3-D analytical model (AM) based on the superposition theory for the proposed CAP-MLS is established to analyze and predict the magnetic field distribution in air gap, thrust force, and torque. The analytical results are compared with those from a 3-D finite element AM and experimental prototype to verify the effectiveness of the proposed novel topology and its corresponding 3-D AM.