底部显示刮水器电动机的行动。

The bottom shows the wiper motor in action.

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论述了无转速转矩传感器的刮水器电动机机械特性测试基本原理；

The essential theory of the mechanical characteristic test of the wiper motor without torque and speed sensors is discussed in this paper.

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分析了小波脊线与信号瞬时频率的关系，提出了基于小波脊线的刮水器电动机机械特性测试新方法。

The relationship between wavelet ridge and instantaneous frequency is analyzed and a new method of the mechanical characteristic test of the wiper motor based on wavelet ridge algorithm is proposed.

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