1. Introduction:

       The traditional grinding machine spindle is directly started by the power frequency, and the spindle grinding wheel motor runs according to the traditional starting circuit. When there is a certain fluctuation in the grid voltage, the rotation speed of the grinding wheel spindle has a certain fluctuation, which affects the grinding precision of the workpiece. Therefore, considering the improvement of processing quality and processing efficiency, the application of variable frequency speed control technology to the grinding machine can achieve satisfactory results, but the general frequency converter is more and more inconsistent with the on-site requirements such as the grinding machine due to the disadvantages such as poor environmental resistance. Low-frequency, high-torque, high-performance vector inverters with high protection levels have become the application requirements of the grinding machine.

2. the process requirements:

       The grinding machine is a machine tool that grinds the surface of the workpiece with a grinding tool. Most of the grinding machines use a high-speed rotating grinding wheel to grind the workpiece. The high-speed rotating spindle uses the inverter to control the following requirements:

2.1. Low-frequency processing, large torque, when the grinding machine is roughing, the spindle needs to run at low speed. When the general-purpose inverter runs at low frequency, the torque is not large, which makes it impossible to process. Therefore, the inverter needs to have low-frequency and large torque characteristics.

2.2. The spindle runs stepless speed regulation. The spindle adjusts different running speeds according to the requirements of the workpiece, so the inverter is required to have stepless speed regulation capability.

2.3. The running speed is high precision. The high-speed rotation accuracy of the spindle directly affects the accuracy of the workpiece being ground. Therefore, the driven inverter must have high speed accuracy.

2.4. The protection level is high, the environment of the grinding machine is in the environment of high oil pollution, high dust and high humidity. The inverter needs to have high protection level, otherwise it will cause short circuit damage or even a malfunction of the bomber.

2.5. The motor has small jitter and low noise.

3. the system program:

3.1. Option selection

According to the process requirements of the grinding machine, we choose C500 series high-performance vector inverter, the power of the inverter matches the power of the driven motor.

3.2. Introduction of the inverter

The new Corey C500 series high vector frequency converter features superior performance, compact structure, complete protection functions, and rich and flexible peripheral interfaces and functions. It can adapt to various harsh environments such as humidity and dust, and can be applied to all industries and The second development is flexible according to the site conditions. It has the following characteristics:

(1) The low frequency torque is large. Vector zero speed can reach 150% starting torque, in high frequency operation mode, up to 600.0Hz base frequency output

(2) Built-in multi-speed and simple PLC function

(3) The priority of the frequency/speed setting channel can be flexibly configured.

(4) Rich warning and protection functions

(5) High protection grade IP54, which can be used in various harsh environments such as humidity and dust.

4. the system advantages:

       Using the C500 Series High Performance Vector Inverter has the following advantages:

4.1. Low frequency torque, 0.5HZ 150% starting torque in open loop vector mode to ensure normal processing of the system under low frequency conditions

4.2. High speed accuracy, in the open loop vector mode, the speed accuracy is 0.2%, ensuring the accuracy of machining

4.3. Wide speed range, 1:200 speed range is enough to ensure stepless speed regulation

4.4. High-frequency output, C500 maximum 600HZ frequency output, to ensure high-speed machining requirements

4.5. IP54 protection level to ensure the normal operation of the machine in harsh environments

V. Conclusion

   SINCR C500 series high performance ring vector inverter, based on new hardware design platform, can adapt to various harsh environments such as humidity, dust, etc., effectively resist dust, oil, high humidity, acid corrosive substances and other high pollutants damage to the inverter. To ensure the safe use of the inverter in extremely harsh environments, it can solve the requirements of the use of the grinding machine, improve the efficiency, greatly reduce the failure rate caused by the harsh environment, and is highly recognized by the grinding machine customers.