Abstract
In view of the special rotor structure of liquid suspension three-degree-of-freedom spherical motor, an optimal design of the motor structure is proposed by using the cooling passage of the stator shell. The spherical spiral groove is added to the stator structure as the cooling passage. Based on Navier-Stokes equation of incompressible viscous fluid, the oil film pressure distribution, oil film thickness distribution and oil film temperature distribution are calculated by numerical method. Spiral groove oil chamber can effectively avoid oil film rupture or cavitation effect. Through the bi-directional coupling analysis of the multi-physical field of the FEM (finite element method), the heat loss of the motor and the viscosity coefficient of the lubricant are coupled in the form of temperature field, and the viscous-temperature characteristic curve of the fluid. The temperature rise distribution of the oil film is obtained. Comparing the cooling effect of three kinds of stator shell materials: aluminum, plastic and rubber, the cooling effect of aluminum is the best, which verifies the validity and feasibility of the spiral groove design, and lays a foundation for the further optimization design of liquid suspension three-degree-of-freedom spherical motor.
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