注：表8-3中给出的每小时起动次数CZ只考虑了电动机转子转动惯量，但实际应用时还要计及被拖动机械的惯量，所以实际起动次数Z应按下式计算：C=(jm+jext)/jm Z=CZ/C式中，jm—电动机转动惯量；jext—折算到电动机轴上的被拖动机械转动惯量；CZ—只计及电动机转子转动惯量每小时起动次数(C=1时)。Z—计及传动系统全部量。
Note: the starting times CZ given in table 8-3 only consider the moment of inertia of the motor rotor. However, in practical application, the inertia of the driven machine also need to be taken into account. Thus, the acutal starting times Z should be calculated as follows: C=(jm+jext)/jm Z=CZ/C, wherein jm-moment of inertia of motor;jext-inertia of the driven machine converted to motor shaft;CZ-starting times per hour(C=1h) only taken into account of the moment of inertia of the motor rotor;Z-inertia of the transmission system.