Abstract
Due to the solid rotor structure, High-Voltage Line-Start Solid Rotor Permanent Magnet Synchronous Motor (HVLSSR-PMSM) operates with high rotor temperature rise. If the ventilation path cannot take the rotor heat away in time, the rotor will overheat or even may led to the thermal demagnetization for permanent magnet. Therefore, it is of great significance to study the thermal issues of HVLSSR-PMSM. In the paper, the fluid field and temperature field of a 315 kW, 6 kV HVLSSR-PMSM with air-cooled hybrid ventilation systems are investigated. Firstly, the electromagnetic analysis of the machine is done by using the finite-element method, the loss distributions then are obtained, which will be assigned as the heat source for thermal analysis. Then, the three -dimensional (3-D) fluid thermal coupled mathematical model for thermal analysis of HVLSSR-PMSM is established. The temperature field and the fluid flowing state of HVLSSR-PMSM with single ventilation path air-cooled system are investigated by using the established 3D fluid thermal coupled mathematical model. A dual ventilation path air-cooled system for HVLSSR-PMSM is proposed to reduce the operating temperature rise. Then, the temperature field and fluid field of HVLSSR-PMSM with dual ventilation system are analyzed by comparing with single ventilation system. Moreover, the temperature experiments are carried out on the machine with dual ventilation system to validate the accuracy of the established mathematical models. The results show that the proposed dual ventilation path air-cooled system can effectively improve the thermal distribution of HVLSSR-PMSM, whilst it can also reduce the working temperature rise of the machine.
Highlights
IntroductionThe high -voltage line -start solid rotor permanent magnet synchronous motor (HVLSSR-PMSM)
The high -voltage line -start solid rotor permanent magnet synchronous motor (HVLSSR-PMSM)has attracted much attention as a candidate for heavy duty applications such as pumps for cooling system in power plants, large air compressor for mines, and fans, due to their inherent advantages of high efficiency, high power factor, high starting torque, and low starting current [1,2]
The temperature field and fluid field of HVLSSR-PMSM with dual ventilation system are analyzed by comparing with single ventilation system
Summary
The high -voltage line -start solid rotor permanent magnet synchronous motor (HVLSSR-PMSM). In the actual operation of solid rotor permanent magnet (PM) synchronous motor, the rotor eddy current loss is considerably large. It is of great significance to study the ventilation path air-cooled system in solid rotor PM machines to reduce the temperature rise and improve the reliability and operation life. The fluid thermal coupled mathematical model is established, the fluid flowing state and thermal field of HVLSSR-PMSM with single ventilation path is studied. In order to reduce the temperature rise of the HVLSSR-PMSM, the dual air-cooled ventilation systems are presented and the fluid field and thermal field are investigated by comparing with that with single ventilation path. 4.2 mm HVLSSR-PMSM, high-voltage line-start solid rotor permanent magnet synchronous motor.
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