变频器是电牵引采煤机的核心部件。
The frequency transformer is a key part of shearer loader with electrical haulage.
根据电牵引采煤机的使用情况，提出了采煤机使用制动单元的必要性。
According to working condition of the electric haulage shearer, this article points out the necessity of using braking unit.
结合电牵引采煤机破碎机构行星齿轮传动原理，应用数学规划理论进行机械优化设计。
Couple transmission principle of electric haulage shearer breaking mechanism planet_gear use maths program theory for optimization of mechanical design.
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