NUMERICAL STUDIES FOR ELECTROMAGNETIC FIELD AND HEAT TRANSFER FOR SPECIAL ELECTRIC MACHINES
DOI:
https://doi.org/10.36801/Keywords:
numerical modelling, FEM, Comsol Multiphysics, electromagnetic field, heat transfer, DC-LATMAbstract
This paper aims to present the preliminary analysis, the development and presentation of the two-dimensional and three-dimensional numerical models as well as the analysis of the results obtained for a DC Limited Angle Torque Motor, type TQR 10/2. The approached motor presents specific technical aspects (constructive and functional) and novelty in the field of torque motors with limited angle. These types of motors are recommended for applications where both volume and weight are critical requirements. The applications of DC-LATM are diverse: in the fields of aerospace, military technique, medical etc. For special applications (eg aerospace) a redundant motor solution is required. The motor is designed for applications that require rotation over a certain angular range, ie ± 90 °. The paper aims to study the electromagnetic field and heat transfer of the mentioned DC-LATM, by making two- and / or three-dimensional numerical models, using the finite element method. This stage in DC-LATM development offers the possibility to evaluate different motor configurations by considering multiple models that are used in the design, in order to establish an optimal constructive solution. For the study of the electromagnetic field, two- and three-dimensional numerical studies are carried out, which aims to calculate specific sizes and characteristics of limited-angle torque motors: magnetic induction in the magnetic circuit of the motor and the torque-angle characteristic on the motor functional range. For the study of the heat transfer of the studied DC-LATM, TQR-10/2, three-dimensional numerical models were used for the transient thermal analysis in order to observe the temperature distribution in the motor. The DC-LATM type TQR-10/2 motor is built in insulation class F. Thus, the maximum allowed temperature is 155°C. Using the numerical modeling, it is established the time when the winding temperature reaches the maximum allowed value for this type of motor. Also, multiple models are considered that suppose the variation of the coefficient of heat transfer by convection (h = (0... 10) W*m^(-2)*K^(-1)). Using numerical modeling, various configurations for a DC limited-angle torque motor have been evaluated with high precision. Thus, the number of models manufactured during the prototyping phase is minimized, which represents an economic advantage as the manufacturing costs are reduced.
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