Ventilation Structure Improvement of Air-cooled Induction Motor Using Multiphysics Simulations
Abstract: Optimal design of
large induction motor is a process that involves electrical and mechanical
skills as well as thermal and fluid dynamic skills. For recent machine layouts,
one cannot rely on standard analysis methods. In multiphysics simulations which
are done by weak coupling finite-element method, rotation boundary values on
interface between air gap and rotor cannot be applied directly for
fluid-dynamical analysis. A novel multi-component fluid method is proposed to
deal with the influence of rotor rotation upon the air convection. This paper
investigates a 3-D multi-physics simulation used in simulation of temperature
distribution in air-cooled induction motor. The temperature rise in motor is
due to Joule’s losses in stator windings and the induced eddy current in
squirrel cages, and heat dissipation by air convection and solid conduction.
The Joule’s losses calculated by 3-D eddy-current field analysis are used as
the input for the thermal field analysis, which deeply depends on accurate air
fluid field analysis. Through the coupled-field calculation, we proposed a new
ventilation structure of a 15-phase motor to improve the cooling performance.
Keywords: air-cooled
asynchronous induction motor, Eddy current field, finite-element method (FEM), fluid
field, Multiphysics simulation
Author: Yujiao Zhang,
Xiongfeng Huang, Tao Huang, Jiangjun Ruan, Xiaowen Wu
Journal Code: jptkomputergg120069
