方形与圆形永磁机构的比较

Comparison between Square and Circular Permanent Magnet Mechanism

通过对方形与圆形永磁机构动特性的计算,对两种机构的性能进行了比较。在满足真空断路器分、合闸速度特性的情况下,圆形机构的铁心和永久磁铁的质量、机构的体积与总重量都明显小于方形机构,而且在分、合闸操作过程中分、合闸线圈的峰值电流和消耗的能量也较小,但方形机构的结构比较灵活,它可以在维持长度不变的条件下,在厚度方向扩展,以满足断路器机构箱体尺寸的要求,同时方形机构有利于发展系列化产品。

The paper describes the dynamic characteristics of square and circular permanent magnet mechanisms. On condition of satisfying the dynamic characteristics of vacuum circuit breaker, the masses of iron core and permanent magnet, the size and the total weight of the mechanism with circular structure are obviously less than those with square one. Furthermore, compared with the square structure, consumption energy and the peak value of the operation current with the circular structure are less too. On the other hand, the structure with the square type is more flexible. Its width can be extended to meet the requirement of the mechanism roomsize while the length remains unchanged. Meanwhile, it is easier to develop a series of products.