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注：表8-3中給出的每小時起動次數(shù)CZ只考慮了電動機(jī)轉(zhuǎn)子轉(zhuǎn)動慣量，但實(shí)際應(yīng)用時還要計(jì)及被拖動機(jī)械的慣量，所以實(shí)際起動次數(shù)Z應(yīng)按下式計(jì)算：C=(jm+jext)/jm Z=CZ/C式中，jm—電動機(jī)轉(zhuǎn)動慣量；jext—折算到電動機(jī)軸上的被拖動機(jī)械轉(zhuǎn)動慣量；CZ—只計(jì)及電動機(jī)轉(zhuǎn)子轉(zhuǎn)動慣量每小時起動次數(shù)(C=1時)。Z—計(jì)及傳動系統(tǒng)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.