###### Abstract  
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. electromagnetic field analysis; electronic stability control; permanent magnet; traction control valve; electric vehicle 29 June 202  
brake system (ABS) and brakes each wheel independently. This helps maintain braking and directional stability. As shown in Figure 1a, the ESC controls the brake unit for each wheel through an electronic control unit (ECU), pump, and solenoid valves installed in a hydraulic electronic control unit (HECU) [14; 15; 16]. As shown in Figure 1b, the solenoid valves applied to ESC include inlet solenoid valve (IV), outlet solenoid valve (OV), electric shuttle valve (ESV), and TCV. It has a brake function when the vehicle is stopped, an auto-hold function that eliminates the need to press the brake pedal when waiting at a traffic light, and a solenoid valve to prevent slipping on slopes. Of the four solenoid valves, this is the TCV. As shown in Figure 2a, since the conventional TCV had to continuously supply power during the operation maintenance period after power on, the life of the electric system was shortened due to heat generation and power consumption. Solenoid valves up to now have a structure and method similar to those of conventional TCVs. The on/off solenoid valve that opens and closes the flow path or the proportional control solenoid valve that controls the flow rate by current has been mainly studied. [PERSON] derived the governing equations for optimal on/off solenoid design and developed a design program consisting of electromagnetic theory and experimental parameter values [17]. [PERSON] et al. studied the modeling, optimization, and validation methods of a hollow plunger-type solenoid for a high-speed on/off valve [18]. [PERSON] et al. presented an electrical model of an on/off solenoid valve used to regulate brake pressure in an anti-lock braking control system (ABS) [19]. [PERSON] et al. inferred and analyzed the factors affecting the performance of proportional solenoids, and studied how to select magnetic materials [20; 21; 22]. [PERSON] studied the dynamic characteristics of the proportional solenoid and designed the solenoid to be automatically adjusted to the target performance [23]. However, for the on/off and proportional control type solenoid valve, it was necessary to maintain the magnetization of the magnetic material by continuously applying power to the magnetic coil. The problem is that the power consumption goes up when the power is still supplied. In addition, problems such as shortening of the lifespan of solenoid valve internal parts due to the increase in the internal temperature of the ESC due to the continuous heating of the magnetic coil and malfunctions due to instantaneous power failure may occur.