然而，逆变器输出的PWM(脉冲宽度调制)连续高压脉冲的上升沿很陡、频率很高，导致在脉冲电压下牵引电机绝缘过早失效。

However, Pulse Width Modulation (PWM) which was input from inverter is characterized by steep rising edge and high frequency, resulting in the too early failure of motor insulation.

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立面：大厅包括一个高度绝缘的模块化幕墙系统，它在两个不同的剖面宽度上发挥作用。

Facade. The hall consists of a highly insulated modular facade system, which plays with two different profile widths.

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