Abstract
The thermal behavior of a canned motor also depends on the losses and the cooling capability, and these losses cause an increase in the temperature of the stator winding. This paper focuses on the modeling and simulation of the thermal fields of the large canned induction motor by different calculation methods of water friction loss. The values of water friction losses are set as heat sources in the corresponding clearance of water at different positions along the duct and are calculated by the analytical method, loss separation test method, and by assuming the values that may be larger than the experimental results and at zero. Based on Finite volume method (FVM), 3D turbulent flow and heat transfer equations of the canned motor are solve numerically to obtain the temperature distributions of different parts of the motor. The analysis results of water friction loss are compared with the measurements, obtained from the total losses using the loss separation method. The results show that the magnitude of water friction loss within various parts of the motor does not affect the position of peak temperature and the tendency of the temperature distribution of windings. This paper is highly significant for the design of cooling structures of electrical machines.
Highlights
The canned motors are currently limited by bearing technologies and the thermal field, preventing a high reliability and long lifetime
This paper presents the analysis of the effect of water friction loss on the temperature of canned motor components such as the stator winding, rotor copper bar, rotor iron core, and on the internal water passage
A canned motor has been taken as an example, and a method was presented to study the effect of friction losses on the calculation of the thermal field of the motor using the computational fluid dynamics (CFD) FLUENT
Summary
The canned motors are currently limited by bearing technologies and the thermal field, preventing a high reliability and long lifetime. The effects of friction loss in electric machines were often neglected in past research; in recent years, the friction loss has been considered one of the important factors that might affect the bearing life of the canned motor and account for the percentage of fly wheel loss of the motor due to the increased rotational speeds. There is no study on the friction loss and calculation method of the water-cooled canned motor for the temperature rise of internal components and bearing safety. The research object is a canned motor in this paper; a calculation method is presented to study the effect of friction losses on the thermal field of the motor, and the effect on the peak temperature and temperature variation characteristics of important parts are analyzed. The study has been carried out by computational fluid dynamics (CFD) approaches adopting five friction loss values: theoretical, experimental, assumed 1.1-times experimental, and the CFD module; the last one is the ideal case assuming no friction loss
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