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Different from ordinary AC machines, the design of a bearingless permanent magnet slice motor (BPMSM) considers not only the torque performance, but also the passive and active suspension properties. In addition, BPMSM for a maglev centrifugal pump has unique design characteristics due to the integration of the pump head and sensors. This paper investigates evaluation and design techniques based on a cluster of performance metrics targeting on developing BPMSM for a maglev centrifugal pump. The cluster of performance metrics for BPMSM, including passive stiffness ($k_z$, $\left|k_z/k_x\right|$, $\left|k_z/k_y\right|$, $k_{\alpha }$, and $k_{\beta }$) and active factors ($k_i$ and $c_m$), is first proposed and an evaluation function $f_i\left(S_i,L_i\right)$ is constructed. Then, practical configurations of BPMSM for a maglev centrifugal pump are summarized. Based on the cluster of performance metrics, the finite-element method (FEM) is used to explore the impact of the rotor magnetization (sinusoidal, diametric, and radial method) on motor properties. Subsequently, the complete design process of BPMSM for a maglev centrifugal pump is introduced and key differences (including three crucial geometric parameters: ratio of rotor height to diameter $\lambda$, magnetic gap length $\delta$, and stator tooth width ${\alpha }_{st}$) in the design considerations between BPMSM and general bearingless motors are analyzed. Finally, the upgraded performance ($k_z$, $k_{\alpha }$, $k_{\beta }$, $k_i$, $c_m$, and $f_i\left(S_i,L_i\right)$ increased by about 29%, 38%, 33%, 31%, 21%, and 15%, respectively) of the designed candidate is obtained, which verifies the effectiveness of the proposed design methods. Full article