Analysis of relevant aspects of thermal and hydraulic modeling of electric machines. Application in an Open Self Ventilated machine

Thermal nexus model for the thermal characteristic analysis of an open-type air-cooled induction motor

“…Dong et al [8] performed a thermal characteristic analysis of an open-type permanent magnetic motor using an auxiliary circuit for the internal air flow of the motor. Malumbres et al [1] increased the accuracy of the open-type motor analysis by refining the auxiliary circuit structure and the convective heat transfer coefficient of the motor. However, these studies did not simultaneously analyze both the thermal circuit for heat transfer by convection or conduction, and the heat transport by air flow.…”

“…For this reason, many studies have been conducted to analyze the thermal characteristics of motors. Most studies have used a thermal circuit model called the thermal equivalent circuit model or the thermal network model [1] because it is less labor intensive and requires less time for computation than the computational fluid dynamics (CFD) method [2][3][4]. Li et al [5] proposed subdividing the thermal resistances of the components of a motor with complex and varying geometries.…”

Strategic Consideration and Numerical Simulation on Life Extension and Uprating of 25 Years Services Life Coal Fired GeneratorStrategic Consideration and Numerical Simulation on Life Extension and Uprating of 25 Years Services Life Coal Fired Generator

“…It is of common practice in thermal modeling of electric machine to use the lumped thermal method, however if higher level of details is required, it needs to use the more refined methods like numerical method based on finite element or finite difference. These types of methods can give a highly accurate and clear view of the temperature distribution within the electric machine [16], [17]. This paper considers the thermal analysis on a 400 MW hydrogen cooled generator using numerical method based on finite element.…”

Thermal Study for Power Uprating of 400 MW Generator Using Numerical Simulation

“…Friction loss is computed using equation: (4) where k fb is the constant of bearing friction with the approximation of 1-3, W r = weight of the rotor (kg) and n = rotational velocity (rpm). Meanwhile, wind losses P wind are computed using equation: (5) where D r = outer diameter of the rotor (m) dan L en = length of stator lamination (m).…”

“…The LPTM is the main tool for a fast yet accurate thermal analysis. However, a common drawback to this approach can make it useless to a designer, because there is a need for experimental data in order to tune parameters that are very important in order to obtain accurate results [4]. It is of common practice in thermal modeling of electric machine to use the lumped thermal method, however if higher level of detail is required, it needs to use the more refined methods like numerical method based on finite element or finite difference.…”