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Description
Torque motors for servo valves were created about 50 years ago, and they are used in several military and aerospace applications. Servo valves, which are now widely used in the general industrial and simulator fields, are still the beginning of fusion devices located at the top of hydraulic devices can do. A common torque motor uses a feedback spring for the rotor's alignment. This is a drawback that a separate mechanism is required like feedback spring. This study deals with the design and characteristics analysis of LART (limited angle rotary torque) motor, which satisfies the movement of limited angle when DC current is applied and returns to the initial position when the current is cut off through the magnetic circuit and motor shape design. LART motors using permanent magnets have a high energy density, low weight, and high efficiency. The LART motor in this study has a constant rotation range and it can be applied to a system that regulates the supply amount of fuel, oil, etc., by controlling the movement of the main control valve (MCV). Due to the characteristics of the system, when a specific DC current is applied, the desired rotation angle should be set to maintain the stationary state. When the power supply is interrupted, it should return to its initial position. In addition, ideal control is possible when there is a linear change in the torque value and the rotation range generated according to the magnitude of the current. In order to satisfy these characteristics, this paper study focuses on the design of the rotor, stator structure, the winding method based on the finite element analysis. The validity and reliability of the design method are verified using the manufactured LART motor.
