Affected by electromagnetism and structure, the rotor shaft of big length to diameter ratio high power density asynchronous motor shows low intensity and bad rigidity.
大长径比高功率密度电机受电磁及结构因素的影响，转轴的强度低，钢度差。
The utility model has the advantages of compact structure, long service life, big driving torque and small loss of driving power and small maintenance ratio and can realize the replacement of gears.
本实用新型具有结构紧凑、使用寿命长、传动扭矩大且传动功率损失小的优点，它可以实现挡位的更换，维修率小。
The utility model overcomes the shortcomings of complicated structure, easy fault, big noise, large power consumption and especially unlifelike actions in the prior art.
克服了已有技术结构复杂、容易故障、噪音大、耗电大，特别是动作不逼真的弊病。
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