On the basis of a comparative analysis of various pole-changing and speed-adjusting schemes for marine AC three-speed winch motors, the paper presents a new design adopting a patent method which changes pole by changing the unit ampere conductor.

• 本文在分析比较船用交流三速起货机电动机变极调速方案的基础上，提出采用专利“安导元变极法”改进设计，从而在原机座基础上使电动机输出功率提高、运行性能改善。