新型含永磁电磁铁的设计与研究-电气工程专业论文.docx

AbstractPneumatic steering gear is widely used as an actuating element in medium-range and short-range missiles’ attitude adjustment. Electromagnet is a critical component of the electromagnetic valve in the pneumatic steering gear. By controlling the action and release of the electromagnet, the gas circuit can be switched, thus to control the twirl of pneumatic steering gear, and control the attitude adjustment of the missile. Therefore, the performance and reliability of electromagnet can affect the accuracy of the missile directly.For the quondam electromagnet in one type of pneumatic steering gear, the coil should be energized continually to keep the suction state, which lead to high power consumption and temperature rise, thus effecting the force performance of the electromagnet and also the reliability of the pneumatic steering gear. Aiming at this problem, this paper redesigned the electromagnet, used permanent magnet in the electromagnet, achieved the functions of permanent magnet flux holding and coil magnetic flux acting. The redesigned electromagnet meeted the requirements of force performance and dynamic response time, reduced power consumption and increased the reliability at the same time.Firstly, the structure of the electromagnet was redesigned, three schemes were presented. Equivalent magnetic circuit model of all schemes was builded. To meet the demand of suction retaining force, the permanent magnet’s size was confirmed by calculating with the equivalent magnetic circuit.The static electromagnetic attractive force was calculated with the equivalent magnetic circuit, the result was compared with the demand, thus comfirmed the feasibility of each scheme and the best scheme was choosed as the implement scheme.Secondly, using finite element software ANSYS, builded the 3D finite element model of the implement scheme’s electromagnet. The static characteristics of the electromagnet was simulated. The static force in 0 ampere-turn, pull-in ampere-turn an