The frequency converter is an electric energy control device that uses the on-off action of power semiconductor devices to transform the industrial frequency power supply into another frequency.
It is mainly composed of rectifier (AC to DC), filtering, Inverter (DC to AC), braking unit, drive unit, detection unit and micro-processing unit.
Generally speaking, frequency converters processed by imported CNC lathes must have several basic capabilities: 1. Energy saving; 2. Speed regulation; 3. Protection functions can be divided into the following two categories
(1) After detecting the abnormal state of imported CNC lathe processing, it will automatically carry out corrective actions, such as over-current stall prevention and regenerative over-voltage stall prevention.
(2) After detecting the abnormality, block the PWM control signal of the power semiconductor device to make the motor stop automatically. Such as overcurrent cutoff, regeneration overvoltage cutoff, semiconductor cooling fan overheating and instantaneous power failure protection.
Application of frequency converter in machine tool industry
Due to the wide processing range of the machine tool, different workpieces, different processes, and different tools, the execution parts of the machine tool are required to have different movement speeds. Therefore, the main movement of the machine tool should be able to adjust the speed, and the machine tool user should adjust the speed of the Inverter product. The role is more concerned.
The spindle is an important part of the composition of the lathe processed by the imported CNC lathe. It plays an important role in improving the processing efficiency, expanding the range of processing materials, and improving the processing quality. The frequency converter is mainly used in the spindle speed control system. At present, the frequency converter is very cost-effective for customers, so it is very common to use the frequency converter on the lathe.
To smoothly use the general-purpose Inverter in the machine tool industry processed by imported CNC lathes, there must be two important considerations: one is to select products with sensorless vector control, and the other is to design at overspeed to increase low-speed torque.