数控车床外文翻译---数控车床实验系统的主轴变频调速系统设计分析-数控设计(编辑修改稿)

数控车床外文翻译---数控车床实验系统的主轴变频调速系统设计分析-数控设计(编辑修改稿)内容摘要：

constant torque or speed reducing device should also pay attention to the torque matching。 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。 the cable, motor on the coupling capacitance exists, also can cause the increase of current, converter capacity should be increased properly。 and adopts the PWM control inverter, rectifier controllable converter, power factor is relatively low, the harmonic pollution is serious, cannot realize energy recycling, in demanding situations, rectifying and inverting process using PWM control of double PWM frequency converter ( 10 ). In the CNC lathe in the experiment system, selection of inverter, inverter current rating is a key quantity. The 4 pole above the motor or motor connected in parallel, must with total current does not exceed the rated current for the principle of frequency converter. CNC machine tool belongs to continuous operation, continuous operation to control the rated capacity and rated current should satisfy the type: ( 4) Type : PM load required motor power output shaft。 the ETA, the efficiency of the motor ( usually about )。 Cos motor power factor ( usually about )。 UM motor voltage, V。 IM: A。 K motor current, current waveform correction coefficient ( PWM ~ 1 )。 PCN inverter rated capacity, kVA。 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。