數(shù)控車床外文翻譯---數(shù)控車床實(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)-免費(fèi)閱讀
【正文】 體積小 、 重量輕 、 安裝尺寸和 Y 系列相同 ， 特別適合在數(shù)控車床實(shí)驗(yàn)系統(tǒng)中使用 。 4 數(shù)控車床實(shí)驗(yàn)裝置 數(shù)控實(shí)驗(yàn)裝置屬于小型實(shí)驗(yàn)機(jī)床 ， 調(diào)速范圍不大 ，不需要換擋 。 ICN— 變頻器的額 定電流 ， A。對(duì)于采用 4 極以上電動(dòng)機(jī)或者多電動(dòng)機(jī)并聯(lián)時(shí) ， 必須以總電流不超過(guò)變頻器的額定電流為原則 。 能通過(guò)變頻裝置的電壓提升 ，保證電動(dòng)機(jī)在 5 Hz 時(shí)輸出額定轉(zhuǎn)矩而不致使電機(jī)因發(fā)熱而燒毀 。 所以 ， 數(shù)控車床實(shí)驗(yàn)系統(tǒng)變頻電機(jī)的選擇 ， 還應(yīng)考慮 : ① 電機(jī)與車床主軸功率特性匹配問(wèn)題 。 f— 進(jìn)給量 。 VnFz ??nFx p axFzp 1 變頻調(diào)速的基本原理 交流感應(yīng)電動(dòng)機(jī)的轉(zhuǎn)速為 :n0 = n( 1 － s) = 60f( 1 － s) /p ( 1) 式中 : f— 定子電源頻率 ， s— 轉(zhuǎn)差率 ， p— 磁場(chǎng)極對(duì)數(shù) 。 研究結(jié)果表明 ， 選 擇的變頻電機(jī)與變頻器配置合理且其調(diào)整性能和啟動(dòng)轉(zhuǎn)矩均能滿足實(shí)驗(yàn)系統(tǒng)的要求 。 ICN, the rated current of the inverter, A. Frequency converter and asynchronous motor is posed of different speed regulation system, the converter capacity calculation methods are also different. The above applies to single inverter for single motor supply and continuous operation, the three are unified, selection of frequency inverter capacity should meet 3 formula. In the CNC lathe spindle speed control system in the experimental system, frequency converter is selected in accordance with the motor models identified, motor PCN≥ kPMη cos ( kVA) PCN≥ k 3UMIM 10 － 3 ( kVA) ICN≥ kIM( A) 4 rated current of IM for 12 A, rated voltage 380 V, rated at kW, select the converter capacity and rated current should satisfy the type: ???????????????????????????????( 5)??On the dynamic performance requirements of high CNC experiment system, the original use of DC transmission. At present, vector control inverter has been universal, for the requirements of high precision, fast response CNC experiment system, the use of vector control of high performance generalpurpose inverter is a kind of very good plan ( 11 ), and, in small capacity inverter with voltage type frequency converter, the system selects the Mitsubishi 7KCHT series FRA7403. Frequency converter. Its basic parameters: rated current of A, the rated capacity of 9 kVA, allowing maximum motor power is kW, the rated current for 150%, rated output voltage of 3 phase 380 V to 480 V, admissible voltage fluctuation of + 5%, be forced air cooling. This study selected variable frequency motor and inverter configuration is reasonable, and its adjustment performance and the starting torque can meet the system requirements. 4 CNC lathe experimental device Numerical control experimental device is a small experiment machine, speed range is not big, do not need to shift gears. Spindle speed control experimental device wiring diagram as shown in Figure 1, the TA, TB, TC terminal connected to an external control circuit, PA, PB terminal used to brake, SVC, 0V terminal used to change the frequency, COM, SCW, SCCW terminal control motor positive inversion, QF air switch, with isolated power supply, circuit breaker, too current, voltage and other protection. CNC Experiment Platform diagram as shown PCN≥ kPMη cos = 1． 05 5． 50． 85 0． 75 = 9． 0( kVA) PCN≥ k 3UMIM 10 － 3 = 8． 3( kVA) ICN≥ kIM = 1． 05 12 = 12． 6( A) 5 in figure 2.. CNC lathe experimental system is the use of experimental control panel on the working table control, the panel can reflect each part of the operation condition. Failure in the panel show, make the system more intuitive, convenient for CNC lathe detection, repair and troubleshooting, and other aspects of learning. The design of variable frequency speed regulation system of NC lathe experiment is an important part of the system, the experimental system in CNC lathe, spindle speed by frequency conversion motor and inverter with the use of variable frequency adjustable speed, a speed electromagic motor has the advantages of simple structure, convenient repair, and has high efficiency, obvious energy saving effect。 the cable, motor on the coupling capacitance exists, also can cause the increase of current, converter capacity should be increased properly。 VnFz ??nFx p axFzp radial force。 adjustable frequency motor。axFzP ( 3) According to the numerical control la
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