In this system, the variable frequency motor is applied to meet the requirement of low speed to check the compositive error and high speed to measure the vibration.
针对检测综合误差和振动时对主轴转速的要求，采用变频电机来控制主轴转速，以满足系统对转速的要求。
It is shown that the error of transient engine speed measurement comes from both the time interval counter and crank angle measure.
瞬时转速测量的主要误差为晶振脉冲计数误差和转角计量误差。
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