light industry

First, the foreword
NC machine tool is thirty years comprehensive application of mechanical, electrical, hydraulic and gas dynamic, microelectronics and information on a number of technology for the integration of mechanical and electrical integration products, in modern machine tool production. In general, the multi motor drag, the spindle and feed system respectively by the respective motor to drag. The machining scope is broad, different parts, different processes, using different tools, machine parts with different speeds, so the main campaign tool should speed, spindle speed control system generally use the AC spindle system, with the development of variable frequency speed control technology, CNC Machine Tool Spindle AC drive can also meet the needs well.

 

Two, CNC machine tools on the requirements of the inverter
CNC machine tools usually require the use of variable frequency motor, or ordinary motor and fan to meet the motor at low frequency heat dissipation requirements, and the requirements of a wide range of motor speed, the requirements of the inverter mainly have the following points:
1) requirements for low frequency torque
ECF500 vector inverter, can come out at low frequency 180% rated torque.
2) torque dynamic response speed, high speed stability
ECF500 vector inverter, can achieve very good dynamic response effect, according to the change of the load, through the change of the output torque to respond quickly, so as to achieve the stability of the speed of the rotating shaft.
3) high speed spindle
With the development of machine tool industry and competition, the requirements of the spindle rotation speed is higher and higher, the choice of ECF500 vector inverter, can make the spindle easy to achieve 5000R/min, frequency converter frequency is 170Hz.
4) plus deceleration time is short
CNC machine tools usually acceleration and deceleration time is relatively short, Yi Chong Fei converter ECF500 rely on its strong performance of the acceleration time and reliable guarantee, deceleration time rely on external dynamic braking resistor and braking unit.
5) motor parameters self-learning
In order to achieve a very good control performance of the inverter usually need to learn the parameters of the motor, the purpose is to obtain accurate internal parameters of the motor to be used for vector control. Parameter self learning requires the motor nameplate parameters: motor rated power, motor rated frequency, motor rated speed, motor rated voltage, motor rated current. Some variable frequency motor nameplate may not mark the rated speed value, can estimate the rated speed according to the value of experience. When the parameters are self - learning, it must be carried out when the load is not supported on the motor shaft. The accuracy of the motor parameters can be guaranteed only when the load is unloaded.
If the field conditions can not carry out no-load operation, please use the inverter factory motor parameters test run.
6) strong anti-interference ability
Yi a fly converter ECF500 in the factory when the good anti interference tests, has strong anti interference ability, but inverter is also a source of interference, in use is difficult to avoid wrong other equipment interference, in CNC machine tools are most likely to interfere with equipment is CNC controller. Once the CNC controller is disturbed, the system will not work properly. In particular, the frequency of the frequency of the frequency of the directive and operational instructions may also be affected by interference, interference will result in serious frequency command is not stable, the frequency conversion error, etc.. To solve this problem approach is in the inverter output line or signal line and ring. At the same time, selection of high-quality CNC of strong anti-interference ability.

Three. Frequency conversion control of CNC machine tools
ECF500 series of high performance vector inverter in the application of a CNC machine tool factory in Shandong, for example, about the CNC machine tool of variable frequency speed control technology.
system parameter
Frequency converter ECF500-5R5G3B, braking resistor 75 /500W, Kaine emperor numerical control system. Main motor parameters and performance indicators: rated power: 5.5kW, rated frequency: 50Hz, rated voltage: 380V, rated current: 11a, rated speed: 1440r / min of mechanical transmission ratio: 1:2, processing materials: steel 45# and actual test performance indicators: (feed performance and speed)
1, spindle speed: 100r/min, frequency converter operating frequency of about 5Hz
2, spindle speed: 2000r/min, frequency converter operating frequency of about 150Hz

Debug result
Actual effect shows the ECF500 series of machine tools dedicated high performance vector transducer can completely meet the requirements of machine tool spindle control, in the 100R/MIN unilateral feed for seven wire (rate of 150%) and frequency converter can in time easily reach 150Hz and parameter setting is simple debugging simple. ECF500 uses the leading flux algorithm, even in low speed (low frequency) operation can also smooth the output of 180% torque, in order to meet the processing needs of different parts. ECF500 inverter with its strong performance and stability of the customer's trust, access to a wide range of use and praise.