【摘要】 电磁吸力(矩)特性与机械反力(矩)特性的最佳配合是电磁继电器产品设计的关键技术。极化磁系统零安匝下的吸合力矩特性(永磁力矩特性)的曲线形状对电磁吸合力矩特性的曲线形状具有较大影响。以往对如何改变永磁力矩特性曲线的形状及如何描述其凹凸程度一直是继电器设计人员难以解决的问题。该文在典型极化磁系统统一数学模型的基础上,将基于能量平衡公式的吸合力矩分解为永磁力矩、极化力矩及电磁力矩,提出了形状因子和形状系数的概念,并采用形状系数描述永磁力矩特性曲线的凹凸程度,分析了磁系统参数及垫片对永磁力矩特性曲线形状的影响,所得出的结论对含永磁的电磁继电器产品设计具有一定的指导作用。更多还原

【Abstract】 The best cooperation between electromagnetic attractive force (torque) characteristic and mechanical spring force (torque) characteristic is the key technique in the process of electromagnetic relay design. The shape of the attractive torque characteristic of polarized magnetic system at zero ampere-turn (i.e. the permanent magnet torque characteristic) has important influence on the shape of the electromagnetic attractive torque characteristic. In the past, it was very hard to change the shape of the permanent magnet torque characteristic and describe its concave and convex extent. Based on the unified mathematics model of the polarized magnetic system, this thesis divides the attractive torque into permanent magnet torque, polarized torque and electromagnetic torque through the energy balance formula, puts forward the concepts of shape factor and shape coefficient, adopts shape coefficient to describe the concave and convex extent of the permanent magnet torque characteristic, analyzes the influences of magnetic system parameters and pad on the shape of the permanent magnet characteristic. The conclusions can direct the design of the electromagnetic relay with permanent magnet.更多还原