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A New Air Cooling System Design of BLDC Motor for xEV Using CFD Modelling
Duc Thuan Vu(부득투안),Pyung Hwang(탕평) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Overheating in electrical motor results in detrimental effects such as degradation of the insulation materials, magnet demagnetization, increase in Joule losses and decrease in motor efficiency and lifetime. Thus, it is important to find ways of dissipation heat from the motor and consequently keep the motor operating at its most efficient temperature. In this paper, the new design to guide air flow through a given BLDC motor are proposed and analyzed specifically by using CFD simulations. The results showed that the temperature distribution of three proposed models are lower than original model, even though speed of cooling fan of original model is reached to very high value at 15x103 rpm. These results also showed that CFD can be effectively used to simulate the heat transfer of BLDC motors.
Duc Thuan Vu,Pyung Hwang 한국트라이볼로지학회 2013 한국윤활학회지(윤활학회지) Vol.29 No.5
Overheating in electrical motors results in detrimental effects such as degradation of the insulation materials, demagnetization of magnets, increases in Joule losses, and decreases in motor efficiency and lifetime. Thus, it is important to find ways to dissipate heat from the motor and to keep the motor operating at its most efficient temperature. In this study, a new design to guide air flow through a given brushless direct current (BLDC) motor is developed and the design is analyzed, specifically by using computational fluid dynamics (CFD) simulations. The results showed that the temperature distribution in the three proposed models is lower than that in the original model, although the speed of the cooling fan in the original model reaches a very high value of 15 × 10³ rpm. The results also showed that CFD can be effectively used to simulate the heat transfer of BLDC motors.
Lumped Parameter Modeling and Analysis of Hybrid Magnet Engine Valve Actuator
Duc Thuan Vu,최영,김진호 한국정밀공학회 2010 International Journal of Precision Engineering and Vol. No.
The hybrid magnet engine valve actuator (HMEVA) composed of two types of magnets (permanent magnet and electromagnet) and two balanced springs is a promising tool for implementing innovative engine management strategies for variable valve timing. Finite Element Method (FEM), a favored actuator design tool due to its high accuracy, was utilized to analyze the electromagnetic actuator, but it consumes a lot of time especially in computation iterations for optimization. Accordingly, the magnetic equivalent circuit analysis can be an alternative tool to FEM because of its computation iteration capability with fair accuracy. In this paper, an equivalent magnetic circuit model of an HMEVA is developed considering the reluctances, external magnetic forces and so on, and the simulation results are presented. In addition, the result of lumped parameter analysis (LA)is compared with those obtained from finite element analysis for verification.
Lumped Parameter Modeling and Analysis of Hybrid Magnet Engine Valve Actuator
Vu, Duc Thuan,Choi, Young,Kim, Jin-Ho 한국정밀공학회 2010 International Journal of Precision Engineering and Vol.11 No.6
The hybrid magnet engine valve actuator (HMEVA) composed of two types of magnets (permanent magnet and electromagnet) and two balanced springs is a promising tool for implementing innovative engine management strategies for variable valve timing. Finite Element Method (FEM), a favored actuator design tool due to its high accuracy, was utilized to analyze the electromagnetic actuator, but it consumes a lot of time especially in computation iterations jar optimization. Accordingly, the magnetic equivalent circuit analysis can be an alternative tool to FEM because of its computation iteration capability with fair accuracy. In this paper, an equivalent magnetic circuit model of an HMEVA is developed considering the reluctances, external magnetic forces and so on, and the simulation results are presented. In addition, the result of lumped parameter analysis (LA) is compared with those obtained from finite element ana£vsis for verification.
Vu, Duc Thuan,Hwang, Pyung Korean Tribology Society 2013 한국윤활학회지(윤활학회지) Vol.15 No.1
Overheating in electrical motors results in detrimental effects such as degradation of the insulation materials, demagnetization of magnets, increases in Joule losses, and decreases in motor efficiency and lifetime. Thus, it is important to find ways to dissipate heat from the motor and to keep the motor operating at its most efficient temperature. In this study, a new design to guide air flow through a given brushless direct current (BLDC) motor is developed and the design is analyzed, specifically by using computational fluid dynamics (CFD) simulations. The results showed that the temperature distribution in the three proposed models is lower than that in the original model, although the speed of the cooling fan in the original model reaches a very high value of $15{\times}10^3$ rpm. The results also showed that CFD can be effectively used to simulate the heat transfer of BLDC motors.
A Novel Cooling Fans Design of BLDC Motor for Air Conditioning System on Electric Vehicle
Pyung Hwang,Duc Thuan Vu 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
Effective cooling is of paramount importance for high speed Brushless Direct Current (BLDC) motor due to their high power density and speed. In this paper, the novel design of cooling fan in a unidirectional ventilated open-type motor for electric vehicles (EV) was studied. Numerical fluid analysis of model was performed. The results showed that the average temperature rise of main components of proposed design decreased by 13.2% compared with that of conventional design. The airflow distributions at different cooling fan geometries were presented and temperature contour of main parts of model were obtained.