Abstract
Approximately 2.5 billion won can be saved every year by replacing existing induction motors, which are traction motors for urban railway vehicles, with permanent magnet motors. This paper presents a study on the structural design of a completely enclosed motor to commercialize an interior permanent-magnet synchronous motor (IPMSM) for the traction of urban railway vehicles. The proposed solution provides protection from an inflow of dust and magnetic powder into the rotor that can deteriorate the motor performance and cause burnout. In addition, unless it is a water-cooled or oil-cooled structure, cooling of an electric motor used in medium and large-sized equipment is not easily accomplished. However, completely enclosed motors are vulnerable to overheating; therefore, research into housing design is required to provide cooling. Additionally, the permissible current density through the stator winding must be considered in the design to prevent the occurrence of thermal demagnetization of permanent magnets. Furthermore, IPMSMs require a separate driver for operation and speed controls for a wide range of operating conditions such as rail traction. Thus, a study has been conducted on IPMSMs and other related driver and control technologies, and their suitability has been validated through performance tests.
Highlights
The importance of urban railways is increasing due to the rapidly increasing traffic demand in urban areas, the limited supply of road traffic facilities, and environmental problems of the earth
This paper presents an interior permanent-magnet synchronous motor (IPMSM) design that provides a higher power density than that provided by existing induction motors, based on research on traction motors for urban railway vehicles
To reduce the heat generation in the enclosed enclosures, an air-circulation path was secured in the rotor and the current density was minimized to the maximum possible extent
Summary
The importance of urban railways is increasing due to the rapidly increasing traffic demand in urban areas, the limited supply of road traffic facilities, and environmental problems of the earth. To maximize the eco-friendliness and energy efficiency, an interior permanent-magnet synchronous motor (IPMSM) is required owing to its high efficiency and light weight. In the case of the existing induction motor, the rotational speed at continuous rating was 1950rpm, the gear ratio was 7.07 (99/14), and the wheel diameter was 820mm. The proposed IPMSM model was designed to satisfy the existing requirements in induction motors used for towing urban railway vehicle. A sensitivity analysis was performed based on the design variables, as shown, to analyze their effects on the torque and torque ripples and derive an optimal model. The result showed that the power density of the IPMSM was 0.79 KW/Kg, which was 75.6% greater than that of the existing induction motor
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