Hyundai Motor starters all the electricity used, the function of starter is quickly and reliably start the engine, so that the normal work of the engine. Therefore, in the choice of engines, must be compatible with the identified good starter; Of course, must choose a good starter with the engine and the transmission ratio of the best fit of the battery charge level. In order to make the engine can be quickly and reliably, the starter must have sufficient power, otherwise it may not start the engine, or an increase in the number of repeat start, start-up time, the burning of starter, the fuel consumption of too many negative impact.1 starter choice of rated power parameters 1.1 engine starter drive minimum speed
Starter must be launched to make the engine work a minimum speed, the rated speed is the starter, and starter of the rated power P determined by the minimum start-up engine speed n_f (unit: r / min) and huge start-up resistance M_f (unit: Nm), that is: P ≥ (M_f × n_f) / 9549.3KW.The engine is determined, start the engine torque and minimum speed start-up will have been identified. In accordance with the conditions of vaporization of gasoline engines in the 0 ~ 20 degrees starting at the minimum speed is generally 35 r / min ~ 40 r / min, at a lower temperature in order to guarantee the start-up reliability and wear and tear to consider in order to in paragraph 1 times after detonation engine can work, generally take the lowest gasoline engine start-up speed for the 50r / min ~ 70 r / min; diesel engines rely on compression ignition, the minimum start-up speed is higher. Because the speed is low, as a result of compression time, heat dissipation, increased leakage, it will cause the end of compression stroke to

現(xiàn)代汽車全部采用電力起動機，起動機的功能就是迅速、可靠地起動發(fā)動機，使發(fā)動機正常工作。所以在選擇發(fā)動機，必須確定好與之配套的起動機；當然還必須選擇好起動機與發(fā)動機的最佳傳動比及適配的蓄電池的電荷量等。為了使發(fā)動機能迅速、可靠地起，起動機必須具有足夠的功率，否則就有可能起動不了發(fā)動機，或出現(xiàn)重復起動的次數(shù)增多，起動時間延長，燒毀起動機，消耗過多的燃料等不利的影響。
1.起動機額定功率參數(shù)的選擇
1.1 起動機驅(qū)動發(fā)動機的最低工作轉(zhuǎn)速。
起動機必須具有使發(fā)動機發(fā)動的最低工作轉(zhuǎn)速，即為起動機的額定轉(zhuǎn)速，而起動機的額定功率P決定于發(fā)動機的最低起動轉(zhuǎn)速（單位：r/min）和起動阻力鉅(單位：Nm),即：P≥(×)/9549.3KW。
發(fā)動機一經(jīng)確定，發(fā)動機的啟動阻力矩和最低起動轉(zhuǎn)速也就已經(jīng)確定。根據(jù)汽化條件，汽油發(fā)動機在0~20度時的最低起動轉(zhuǎn)速一般為35 r/ min～40 r/ min ,為了在更低的溫度下保證起動的可靠性及考慮各種損耗 ,以便在第 1 次爆震后能使發(fā)動機正常工作 ,一般取汽油發(fā)動機的最低起動轉(zhuǎn)速為50r/ min～70 r/ min ; 柴油發(fā)動機靠壓縮點火 ,最低的起動轉(zhuǎn)速要高一些。因為轉(zhuǎn)速低時,由于壓縮時間長 , 散熱、漏氣增加 ,就會使壓縮行程終了時空氣溫度降低，使燃料不易點燃 ,所以柴油機的最低起動轉(zhuǎn)速比汽油機要高,其值隨發(fā)動機形式的不同而不同, 一般為 100 r/ min ～200 r/ min , 再根據(jù)選擇好的起動機驅(qū)動齒輪與發(fā)動機的齒環(huán)的最佳傳動比i (如奧迪轎車的最佳傳動比為 1511) ,即可計算出起動機驅(qū)動發(fā)動機的最低驅(qū)動轉(zhuǎn)速 。即:
i = / = /