Fast Simulation and Optimization Design of a Slotless Micro-Motor for High-Speed and High-Flow Pumps

The effective part of the winding in a slotless motor varies across different axial sections of the motor, resulting in a three-dimensional structure. Therefore, it is not feasible to simply use the single-section simulation method of conventional radial field motors for motor simulation. Currently, the simulation of slotless motors primarily depends on three-dimensional electromagnetic fields, which present significant modeling challenges and require extensive simulation times, rendering them unsuitable for engineering applications. This paper introduces a method for analyzing slotless motors using a two-dimensional electromagnetic field, based on the electromagnetic field simulation software EasiMotor (R2025). The study elucidates the principle of employing a two-dimensional electromagnetic field to analyze slotless motors and applies this method to the design of a slotless motor with a diameter of 4.5 mm. Through the fabrication of prototypes and performance testing, experimental results validate the accuracy and efficiency of this method.