抄録
Switching valves are used in the pulse flow control systems of automotive power transmissions and construction machines. These systems require rapid switching speed for improving precision in control. A combination of overexcitation and demagnetization of the solenoid shortens the switching lag time, while it increases the eddy current in the magnetic circuit. This paper clarifies the nonlinear transient characteristics of magnetic flux flow and electric current by both FEM magnetic analysis and measurement of the solenoid. Newly developed magnetic stainless steel material with a quarter of the electrical conductivity of usual low carbon steel reduces the eddy current and shortens the lag time of magnetic flux flow. The valve switches the flow rate of 7L/min at 14 MPa within 0.8ms.
