The application of the commutation system is controlled by some conditions. The substantial condition of the application of commutation system is the release of the personal danger.

减刑制度的适用需要符合严格的条件限制，最根本的条件应当是犯罪人人身危险性的降低。

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On the condition that there is no material commutation with outside, healing of internal crack and hurt of material depends on the move of internal material and the change of structure.

在与外界无物质交换的条件下，材料内部裂纹与损伤的愈合靠内部物质迁移及结构变化完成。

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Finally it is concluded that PWM-ON-PWM is the existing optimal PWM mode for reducing commutation torque ripples, and achieves this mode on condition of three position sensors.

最后得出对转矩脉动最优的斩波方式为PWM—ON—PWM，并在三个位置传感器的条件下运用位置预测法实现。

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