Abstract
If the integrated starter generator (ISG) motor and inverter operate under continuously high loading conditions, the system’s performance and durability will decrease and the heat dissipation requirements will increase. Therefore, in this study, we developed two cooling designs for the ISG motor and inverter, and then carried out both a model analysis and an experiment on the fluid flow and thermal characteristics of the system under various operating conditions. As the outdoor temperature increased from 25 °C to 95 °C, the coil temperature of the air-cooled motor increased by about 82 °C. Under the harsh-air condition of 95 °C, the coil of the air-cooled motor increased to a maximum temperature of about 158.5 °C. We also determined that the temperature of the metal-oxide-semiconductor field-effect transistor (MOSFET) chip in the liquid-cooled inverter increased to a maximum temperature of about 96.8 °C under a coolant flow rate of 4 L/min and a coolant temperature of 65 °C. The observed thermal performance of the ISG motor and inverter using the proposed cooling structures was found to be sufficient for heat loads under various real driving conditions for a hybrid electric vehicle (HEV).
Highlights
There is an increasing demand for more efficient and higher performing internal combustion engines and hybrid electric vehicles (HEVs) because of climate change caused by the extensive use of carbon fuels and the large amount of greenhouse gases in the atmosphere
This paper identifies the heat transfer characteristics of the Integrated starter generator (ISG) system by analyzing the heat and fluid flows with respect to the driving conditions of the motor, which is a HEV 42-V/5-kW belt-driven ISG motor, and prototypes of the inverter
As the outdoor temperature increased from 25 °C to 95 °C, the coil temperature of the air-cooled motor increased by about 82 °C due to increased heat generation in the motor
Summary
There is an increasing demand for more efficient and higher performing internal combustion engines and hybrid electric vehicles (HEVs) because of climate change caused by the extensive use of carbon fuels and the large amount of greenhouse gases in the atmosphere. To meet this demand, various electrical systems have been embedded in automobiles, and the fuel efficiency of internal combustion engines and HEVs has been improved. An ISG in a HEV is a component that regulates both the starter motor and the generator, which stops the engine when the car stops by activating the idle stop-and-go function This reduces the fuel consumption by collecting energy through regenerative braking [3]. To maximize the efficiency of the ISG, the motor must be matched with an inverter, which is crucial for determining the performance of the ISG [4]
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