數(shù)控車(chē)床外文翻譯---數(shù)控車(chē)床實(shí)驗(yàn)系統(tǒng)的主軸變頻調(diào)速系統(tǒng)設(shè)計(jì)分析-數(shù)控設(shè)計(jì)-wenkub
2023-05-19 01:18:32 本頁(yè)面
【正文】 able frequency ). AC AC frequency conversion is to change the thyristor control angle of changing size and frequency, AC AC voltage and frequency adjustment. Use the thyristor conduction performance, this study put the power to 2 convert AC power to DC power, and then by the use of SCR inverter main circuit, output threephase frequency and voltage can be adjusted, equivalent to a sinusoidal pulse width modulation wave ( SPWM wave ), AC DC AC variable frequency, drag the threephase asynchronous motor speed operation ( 45 ). 2 CNC lathe spindle speed control experiment system of variable frequency motor selection Due to the plexity of cutting process, the cutting force influencing factor is very much, therefore has not yet been derived and easy to calculate cutting force FX, FY, FZ theoretical formula, generally through a large number of experiments, the establishment of the experience formula to calculate cutting force. This study will back cutting depth, feed rate and cutting speed of 3 main factors as variable factors, and other factors, correction coefficient Indirect calculation, it can be FX, FY, FZ 3 ponent ( 6 ) empirical formula: ?????????????????? ( 2) Type : FZ FY cutting force。 N workpiece speed。 the cutting and processing of the heterogeneity of the material, the main motor power should have a certain reserve ( 89 ). Selection of experimental system of Xinxiang City special motor manufacturing pany limited series of 4 YVP variable frequency motor rated power, rated torque of kW, 30 N m, the rated current of 12 A, with similar frequency conversion device matching, interchangeability, general strong, its power, foot mounting FZ = CFz axFyp fyFx variable frequency speed regulation range: 5 Hz ~ 100 Hz stepless speed regulation. The low speed torque smoothing, without creeping phenomenon。 considering the harmonic causes the output current increases, the converter drive motor, especially the reactance small highspeed motor, the capacity should be slightly larger than the mon motor selection。 Cos motor power factor ( usually about )。 PCN inverter rated capacity, kVA。 has the advantages of small volume, light weight, installation size and Y series of the same, particularly suitable for the experimental system used in NC lathe. 5 ending Application of frequency control of motor speed range is very wide, in the following 50 Hz can be used as a constant torque operation, more than 50 Hz for constant power operation, is an ideal speed control mode. For NC lathe spindle speed control system of VVVF, because of its superior performance, high efficiency and energy saving starter, wide speed range, high precision, stepless speed regulation has been widely used, and gradually replace the DC motor speed control. AC frequency converter and frequency conversion motor variable frequency speed control system application in the numerical control lathe, experimental system, more convenient for inspection, repair and troubleshooting, and other aspects of learning, has very high practical value. References ［ 1］ Ding Jinfu, Yu Fujin. The frequency conversion and speed regulation technology in CNC lathe application [ J ]. New technology and new process, 2020 ( 5): 1315. ［ 2］ Zhou Hong, Zhou Wenjun. Numerical control lathe spindle speed realization [ J ]. Machine tool amp。 最后 ， 簡(jiǎn)要介紹了數(shù)控車(chē)床實(shí)驗(yàn)平臺(tái)的設(shè)計(jì)思路 。 變頻器 。 本研究主要探討數(shù)控車(chē)床實(shí)驗(yàn)系統(tǒng)的主軸變頻調(diào)速系統(tǒng)的設(shè)計(jì) 。 變頻器實(shí)現(xiàn)變頻的方式主要有交流 交流變頻和交流 直流 交流變頻 ( 直接轉(zhuǎn)矩控制變頻或矢量控制變頻 ) 。 本研究將背吃刀量 、 進(jìn)給量及切削速度 3 個(gè)主要因素作為可 變因素 ， 而其他影響因素則用修正系數(shù) 間接計(jì)算 ， 可以得出 FX， FY， FZ 3 個(gè)分力的經(jīng)驗(yàn)公式 ［ 6］ : ? ( 2) FZ = CFz axFyp fyFx FY— 徑向力 。 d— 工件直徑 。 axFzP ( 3) 根據(jù)數(shù)控車(chē)床實(shí)驗(yàn)系統(tǒng)的運(yùn)行條件 ， 取 : CFz = 40， xFz = 1． 0， yFz = 0． 75，apmax = 6 mm， fmax = 0． 2 mm/r， n = 2 500 mm/min， d = 30 mm。 變頻器供電下的異步電機(jī)運(yùn)行條件發(fā)生了根本的變化 ［ 7］， 電機(jī)運(yùn)行時(shí)
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