整体铁心磁桥连接主极的后极尖和相邻的不带线圈的横轴磁极；
Solid iron flux bridges are inserted between the lagging tips of the main poles and the adjacent auxiliary poles without windings.
结果表明所设计的网络能够对主极裂纹信号进行有效的自动识别，而且识别的准确度很高。
The result proves the designed network can identify the crack signals of electrode automatically and effectively. Moreover the accuracy is very high.
在无补偿直流牵引电动机中，通常采用主极极弧为圆弧的扩张气隙来改善换向器电位特性。
The opening air-gaps with circular main pole arc are usually used to improve the potential curve of commutator on non-compensable d. c. traction motors.
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