3-D Analysis and Experimental Verification of A Novel Magnetic Lead Screw with Checkerboard Array Magnetic Pole

In this paper, 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, permanent magnet (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 three-dimensional (3-D) analytical model based on the superposition theory for the proposed CAP-MLS is established to analyse and predict the magnetic field distribution in airgap, thrust force, and torque. The analytical results are compared with those from a 3-D finite element analytical model and experimental prototype to verify the effectiveness of the proposed novel topology and its corresponding 3-D analytical model.