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)-在線瀏覽
2024-07-24 01:18本頁(yè)面
【正文】 index and Y series asynchronous motor is pletely consistent, and experimental system Entry requirements. The main technical indexes for the threephase voltage: 380 V / 50 Hz。 through the conversion device of voltage boosting, ensure the motor in 5 Hz rated output torque and the motor for heating and burning. 3 inverter type selection n the CNC lathe spindle speed control experimental system, inverter selection should pay attention to : 1 converter is to realize constant pressure control and constant current control。 the frequency converter and load matching problem of the rated voltage, current, frequency and load rated voltage, current match, for the special load needs to reference the motor performance parameters to determine the maximum current of inverter, current and overload capacity, in the constant torque or speed reducing device should also pay attention to the torque matching。 the cable, motor on the coupling capacitance exists, also can cause the increase of current, converter capacity should be increased properly。 the ETA, the efficiency of the motor ( usually about )。 UM motor voltage, V。 K motor current, current waveform correction coefficient ( PWM ~ 1 )。 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 de
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