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Most solenoid valves in use today require a magnetic coil to be continuously energized to maintain the magnetization of the magnetic body in order to operate. The problem is that if the power is still supplied, the power consumption will continue. In addition, problems such as shortening the lifespan of solenoid valve internal parts due to the increase in the internal temperature of the electronic stability control (ESC) due to the continuous heating of the magnetic coil, and malfunction due to instantaneous power failure may occur. In this study, we conducted a study on the permanent magnet traction control valve (TCV) for ESC that can minimize the unnecessary power consumption of electric vehicle batteries. For optimal permanent magnet design, polarity direction setting and permanent magnet specifications were studied through FE simulation. A permanent magnet TCV was fabricated and an electromagnetic force test was conducted to compare and evaluate it with the FE simulation result. By using a permanent magnet, it was possible to lower the initial current value for the TCV to drive, therefore, it was possible to develop a permanent magnet TCV that can minimize the unnecessary power consumption of electric vehicle batteries.

Reduction of energy in manufacturing industries is a current issue to keep the earth green. This energy saving yields the cost reduction in automotive industries. Many automotive part companies try to improve their manufacturing process to save the manufacturing energy. Specially, many attempts on changing the hot forging process into the cold forging process of plate forging have been tackled in the piston under drive brake used in an automotive transmission module. The turning process after hot forging changed to turning after plate cold forging for the energy and cost reduction. But two extrusion shapes in an outermost diameter of part let fall tool life by interrupted cut in turning. Therefore, it needs thickness reduction of two extrusion areas in the outermost diameter. This study suggests an effective way to reduce the thickness of interrupted cut in forging stage.

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