历史是人们所创造的,但人们并非有意识、有目的地去创造历史,即他们的历史活动是一种无动机的行为。
History is created by people, but people do not create history consciously and purposely, which means that their historical activity is a sort of unmotivated behavior.
在无刷直流电动机高性能速度跟踪系统中,由于PI控制的滞后性,无法根据未来动态行为产生较为理想的PWM波形。
In the environment of high-performance drives, the PWM controller can't produce a fine PWM waveform according to the future dynamic behavior, due to the lag of PI regulator.
在无刷直流电动机高性能速度跟踪系统中,由于PI控制的滞后性,无法根据未来动态行为产生较为理想的PWM波形。
In the environment of high-performance drives, the PWM controller can't produce a fine PWM waveform according to the future dynamic behavior, due to the lag of PI regulator.
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