The Application of Three-crystal Inverter in CNC Machine Tools
May 16, 2023
In recent years, with the rapid development of the economy, the machine tool industry has also witnessed rapid development: it is reflected in the extensive application of new technologies and the significant improvement in corporate profits. At present, the mainstream of machine tool industry consumption is CNC machine tools. From the perspective of the demand for CNC machine tools at home and abroad, the CNC machine tool market has the following features: First, economical CNC machine tools are the mainstream products in the future. Second, adopting new technologies, reducing costs, and improving product stability are the key to business survival. Here we use the frequency conversion speed regulation in terms of machine drag to say SAJ frequency converter application in this industry:
First, the characteristics of the spindle drive of the original machine tool Under normal circumstances, the drive system of the machine tool is driven by the motor to drive the gear box to drive and regulate the speed. It has the following characteristics:
1. The original system overview A. Load - constant power nature When the gearbox is changing speed, the change in torque is inversely proportional to the change in speed. If the loss of the gearbox is not taken into account, it will have constant power in the full power range.
1) Speed grade The speed regulation box has 8 speeds: 75, 120, 200, 300, 800, 1200, 1500, 2000r/min.
2) Main motor rated parameters Rated capacity: 3.7kw
Rated speed: 1440r/min
Load characteristics: Constant power 3) The control mode is controlled by the 8 positions of the handle combination to control the clutch and clutch of the four clutches, resulting in 8 combinations of gears, resulting in 8th gear In recent years, with the rapid economic development, the machine tool industry also has The leap of development: manifested in the extensive application of new technologies and significant improvements in business efficiency. At present, the mainstream of machine tool industry consumption is CNC machine tools. From the perspective of the demand for CNC machine tools at home and abroad, the CNC machine tool market has the following features: First, economical CNC machine tools are the mainstream products in the future. Second, adopting new technologies, reducing costs, and improving product stability are the key to business survival. Here we use the frequency conversion speed regulation in terms of machine drag to say SAJ frequency converter application in this industry:
First, the characteristics of the spindle drive of the original machine tool Under normal circumstances, the drive system of the machine tool is driven by the motor to drive the gear box to drive and regulate the speed. It has the following characteristics:
1. The original system overview A. Load - constant power nature When the gearbox is changing speed, the change in torque is inversely proportional to the change in speed. If the loss of the gearbox is not taken into account, it will have constant power in the full power range.
1) Speed grade The speed regulation box has 8 speeds: 75, 120, 200, 300, 800, 1200, 1500, 2000r/min.
2) Main motor rated parameters Rated capacity: 3.7kw
Rated speed: 1440r/min
Load characteristics: Constant power 3) The control mode is controlled by the 8 positions of the handle to control the clutch and clutch of the four clutches, and the 8 combinations of gears are obtained to obtain the 8th speed.
B. When the overload capacity at low speed is strong and low speed, the rated torque after the speed reduction of the drive system through the gear box will be much larger than the maximum working torque of the load, and there is a strong overload capacity. Consider 1. The adjustment range of frequency conversion speed regulation is very wide, general general-purpose frequency converter can realize stepless speed regulation in the range of 0-400HZ.
2. Consider that the machine tool requires hard mechanical properties. In accordance with the inverter + ordinary motor (or variable frequency motor) transmission has a mechanical characteristics of the hard characteristics. It is generally able to provide 150% load torque at low frequencies. Consider that the machine needs a strong overload at low speeds. The inverter can provide 150% overload protection (60S) and full speed.
B. When the overload capacity at low speed is strong and low speed, the rated torque after the speed reduction of the drive system through the gear box will be much larger than the maximum working torque of the load, and there is a strong overload capacity. Consider 1. The adjustment range of frequency conversion speed regulation is very wide, general general-purpose frequency converter can realize stepless speed regulation in the range of 0-400HZ.
2. Consider that the machine tool requires hard mechanical properties. In accordance with the inverter + ordinary motor (or variable frequency motor) transmission has a mechanical characteristics of the hard characteristics. It is generally able to provide 150% load torque at low frequencies. Consider that the machine needs a strong overload at low speeds. The frequency converter can provide 150% overload protection (60S), can be full
