In order to have a reliable operation, must reduce the speed fluctuation, namely must effectively restrain the load torque ripple and motor electromagnetic torque ripple of speed fluctuation bring.

为了可靠运行，必须降低转速的波动，即必须有效抑制负载转矩脉动和电机电磁转矩脉动带来的转速波动。

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The results show that parabolic interpolation is much better than Gauss surface interpolation and gradient interpolation in calculating speed, accuracy and error fluctuation.

结果表明，抛物面插值法计算速度较快，精度较高，并且误差波动较小。

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The theoretical analysis and experimental results demonstrate that the motor current has some fluctuation in vari-speed cutting process, but it is almost no effect on normal operation of machine tool.

理论分析和试验结果表明，采用变速切削加工时，电机瞬时电流确有一定程度的波动，但不影响机床电机的正常使用；

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