推力脉动率 thrust fluctuation ratio
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实验证明该方式对于减小直线电动机推力脉动，降低噪音是有效的。
The experiment proves that the mode is effective to reduce the pulsation and the noise of linear motor.
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由于要求运行平稳、噪声低，因此推力的脉动要小。
Due to the requirements of smooth operation and low noise, their thrust pulsation must be smaller.
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