We put the two main engineering machine loading which are sinusoidal wave load and step load, and the results indicate that the dynamic responds are satisfied for the needs of the experiments.

加载工程机械主要的两种加载模式正弦波载荷和阶跃载荷，试验台动态仿真的结果表明系统动态响应性能能够满足试验要求；

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Experiments show that the motor phase current controlled by this kind of SPWM inverter can be strictly sinusoidal and the running of the motor can remain steady for the ultra low speed range.

实验结果表明，这种SPWM逆变器控制的电机相电流严格正弦，能在超低速下平稳运行。

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Measurement experiments of a sinusoidal micro-structured surface are carried out.

进行了正弦曲面的测量实验。

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