具有双稳态特性的永磁惯性开关(英文)

Inertial Switch with Bistable Permanent Magnetic Structure

为了提高惯性开关的双稳态特性和可靠性,笔者利用永磁力与磁体间距的非线性关系,设计了一种平行梁支撑结构的永磁式微型惯性开关,建立了永磁力、阻尼力、惯性力、弹性力及触点碰撞力等多力耦合作用下的开关动力学模型.仿真与实验结果表明,在非线性永磁力作用下开关具有良好的阈值特性和闭合接触可靠性.采用离心机对开关样机进行初步测试,得到开关的平均闭合阀值为51.6g(g为重力加速度),与设计值50g的偏差仅为3.2%,闭合后断开阀值分别为7.5g、9.0g和27.0g,显示了开关良好的阀值特性,验证了永磁体应用于惯性开关的可行性.通过改变设计参数可以设计具有不同阀值的加速度开关.

In order to improve bistable characteristic and reliability of inertial switch, a novel permanent magnetic miniature inertial switch with parallel beams was designed based on the nonlinear relationship between the permanent magnetic force and the distance between the permanent magnetic couplings. The dynamic model of the inertial switch, subjected to permanent magnetic force, squeeze-film damping force, good threshold characteristic and high contact reliability inertial force, elastic force and contact force, was established. The were proved by the results of dynamic simulation and experiments. The average threshold acceleration of the switch samples was 51.6g （where g is acceleration of gravity）, which was only 3.2% more than the designed value of 50g. Meanwhile, the cut-off accelerations were 7.5g, 9.0g and 27.0g, respectively. Thus, the feasibility of introducing permanent magnet to the design of the inertial switch is validated, and the switches are simple in structure. The inertial switches with different thresholds can be fabricated by regulating design factors.