A thermal network model for induction motors of hermetic reciprocating compressors

9th International Conference on Compressors and their Systems

Dutra, T.^1 ; Deschamps, C.J.^1

POLO Research Laboratories for Emerging Technologies in Cooling and Thermophysics, Federal University of Santa Catarina, Florianopolis, SC, Brazil^1

关键词: Algebraic equations;    Compressor components;    Different operating conditions;    Hermetic reciprocating compressor;    Single phase induction motor;    Thermal conductance;    Thermal network models;    Volumetric efficiency;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/90/1/012020/pdf
DOI  :  10.1088/1757-899X/90/1/012020

来源: IOP

【 摘 要 】

This paper describes a simulation model for small reciprocating compressors with emphasis on the electrical motor modelling. Heat transfer is solved through algebraic equations derived from lumped thermal energy balances applied to the compressor components. Thermal conductances between the motor components are characterized via a thermal network model. The single-phase induction motor is modelled via an equivalent circuit, allowing predictions for the motor performance and distributed losses. The predicted temperature distribution is used to evaluate the stator and rotor windings resistances. The thermal and electric models are solved in a coupled manner with a model for the compression cycle. Predictions of temperature distribution, motor efficiency, as well as isentropic and volumetric efficiencies, are compared with experimental data at different operating conditions. The model is then applied to analyse the motor temperature as a function of input voltage and stator wire diameter.