The technical requirements of CNC machine tools for VFD.

1. Requires large torque at low-frequency : 0.21Hz output 150% rated torque;

2. Fast response for dynamic torque  , and the speed stabilization accuracy is high. When the load changes, the output torque responds quickly to achieve the stability of the spindle speed；

3. Fast deceleration , the shorter deceleration time is to save the processing cost for customers, which is usually realized by adding a braking resistor;

4. Auto-tuning of motor parameters;

5. The various requirements of frequency command and running command generally originate from CNC analog value setting or multi-stage speed setting. The analog type is mainly voltage type analog value.

Below taking our Yuanxin YX9000 series high-performance vector frequency converter in a CNC machine tool factory as an example to describe the frequency inverter speed control technology of CNC machine.

Yuanxin inverter has the following superior performance:

1. Adopt advanced magnetic flux control algorithm to realize real speed sensorless vector control, which is much better than traditional V/F control in terms of control performance;

2. Large starting torque, 0.21Hz/150%;

3. The carrier frequency range is 0-14KHz; it can be adjusted adaptively according to the characteristics of temperature and load;

4. Provide 0-10V/0 (4)-20mA analog interface, which is compatible with most CNC system interfaces and has strong versatility;

5. Strong overload capacity, 150% rated output current for one minute;

6. Provide multi-functional output terminal signals, such as fault output signal, running signal, speed arrival and other output signals, which can well meet the system's monitoring of the spindle speed status.

Onsite pictures