![]() ![]() Such hysteresis occurs in ferromagnetic materials, however the hysteresis phenomenon includes a minor hysteresis loop which begins with an initial magnetization curve and is generated by DC biased field density. This paper suggests the calculation method of the thrust force considering the hysteresis phenomenon and consequently the accurate force can be obtained. As the ascending or descending magnetic field is applied to the solenoid, different thrust forces are generated. This problem is caused by hysteresis phenomenon. However, the gap between a pressure and a current can occur which brings a delay in a transmission and a decrease in quality. The same form of pressure for the clutch and the input current are required for an ideal control. Solenoid valve is a very important hydraulic actuator for an automatic transmission in terms of shift quality. Yoon, Myung-Hwan Choi, Yun-Yong Hong, Jung-Pyo Improvement in thrust force estimation of solenoid valve considering minor hysteresis loop The curves indicate the optimum solenoid length and outside radius, for minimum power, corresponding to a given outside radius and inside radius, respectively. Three families of curves are obtained which depict the solenoid power for a given force as a function of the solenoid length with either outside radius or inside radius as a variable parameter and as a function of the outside radius with inside radius as a variable parameter. The necessary vertical (axial) force generated by the solenoid is expressed as a function of relevant system dimensions, solenoid design parameters, and physical properties of the body. This sphere, with a radius much smaller than its distance from the solenoid above, is to be maintained in position on the solenoid axis by balance of the vertical electromagnetic force and the force of gravitation. It is assumed that the model of a levitating body is a sphere of ferromagnetic material with constant magnetic permeability. ![]() Optimum dimensions of power solenoids for magnetic suspensionÄesign optimization of power solenoids for controllable and stabilizable magnetic suspensions with force compensation in a wind tunnel is shown.
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