Calculation of transient temperature and rated capacity of three-phase induction motor under different working systems

Abstract

This paper aims to propose a method to determine the temperature rise and rated capacity of induction motors under different working systems. A dynamic mathematical model, a 3D temperature field model, and finite element method are used to analyze the electromagnetic loss and transient temperature rise, respectively. The influence of the motor starting process on the temperature rise is taken into account, which resolves the complex loading of transient heat source. The maximum allowable running times for the motor operating with different overloads are determined. The relationship between the motor output power and the allowable running time is obtained, and it provides a basis to determine the rated capacity of motor under S2 working system. The relationship between the motor output power and the temperature rise under different load duration rates is also obtained and provides reasonable evidence to determine the rated capacity of the motor under S3-working system.

Improvement of Heat Dissipation Structure of Low Speed Permanent-Magnet Motor

“…For the calculation of the motor temperature field, different calculation methods have great influence on the calculation accuracy and time. The common methods for the calculation of the temperature field mainly include equivalent thermal network method [1], finite element method [2], [3], finite volume method [4], [5], [6] and so on. The fluid flow characteristics inside the motor play an important role in the heat transfer.…”