Application analysis of speed control inverter for machine tool
Due to the wide range of machine tools, different workpieces, different processes, and different tools, the inverter has the largest scale in the lathe industry. Therefore, the main motion of the machine tool should be able to adjust the speed, and the machine tool user pays more attention to the speed regulation effect of the inverter product. At present, most of the inverters used in CNC machine tools in China are Japanese brands. The frequency converter is a power control device that converts the power frequency power source into another frequency by using the on/off function of the power semiconductor device.
At present, most of the inverters used in CNC machine tools in China are Japanese brands. For example, Mitsubishi inverters are used in machine tools because of their proximity to the servos. Delta has a lot of cost due to its utility. Cost-effective, the market share has gradually increased in recent years.
In the lathe industry, inverters are the most widely used. However, brands such as Yaskawa, Fuji, Mitsubishi and Taiwan Delta have a large market share. Although there are some domestic brands of inverters selected by machine tool manufacturers, but in the field of high demand for the inverter industry such as grinding machines, forging machine tools, etc., as usual, foreign brands, such as Mitsubishi, Fuji, Siemens, Delta, etc. Brands are always in an advantage. According to the sales data of machine tools in 2008 and 2009, the general-purpose machine tools, especially the complicated lathes, are in serious condition, while the composite machine tools and large-scale heavy-duty products are better. These machine tools have a wide processing scale, and the machine tool implementation components have different activity speeds. They also put forward higher requirements for the function of the inverter. Domestic inverter manufacturers should seize the opportunity to cultivate the machine tool market.
The frequency converter is a power control device that converts the power frequency power source into another frequency by using the on/off function of the power semiconductor device. Mainly composed of rectification (AC to DC), filtering, inverter (DC to AC), braking unit, drive unit, detection unit micro-processing unit and so on. In general, the inverter must have several basic capabilities: 1. Energy saving; 2. Speed ​​regulation; 3. Protection functions can be divided into the following two categories:
(1) The correction operation is automatically performed after detecting the abnormal state, such as overcurrent stall prevention, and regeneration overvoltage stall prevention.
(2) After detecting the abnormality, the PWM control signal of the power semiconductor device is blocked, so that the motor automatically stops. Such as overcurrent cutoff, regenerative 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 machine tool execution parts have different motion speeds. Therefore, the main motion of the machine tool should be able to adjust the speed, and the machine tool user can adjust the speed of the inverter products. The role is more concerned.
The main shaft is an important part of the lathe structure. It plays an important role in improving the machining 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 cost performance of the inverter is very high for the customer, so the frequency converter is very common on the lathe.
In order to use the general-purpose inverter smoothly, there must be two important considerations in the machine tool industry: one is to select the product without speed sensor vector control, and the other is to design the over-speed operation to improve the low-speed torque.
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