Application of Sunwoele H600 series VFD (Variable-frequency Drive) on grinding machine

With the development of frequency conversion speed regulation technology, the use of VFD (Variable-frequency Drive) for grinding machines is becoming more and more popular, but the protection level of general-purpose VFD (Variable-frequency Drive) is low, and the environment of grinding machines is heavy with oil and dust. After that, it cannot work normally. Sunwoele H600 series high protection grade VFD (Variable-frequency Drive) protection grade is IP54. The high protection grade ensures that VFD (Variable-frequency Drive) can meet the harsh environmental requirements of grinding machines.

I. Introduction:

The traditional grinding machine spindle is directly started and operated by power frequency, and the spindle grinding wheel motor operates according to the traditional starting circuit. When there is a certain fluctuation in the grid voltage, it will cause a certain fluctuation in the speed of the grinding wheel spindle, which will affect the grinding accuracy of the workpiece. Therefore, considering the improvement of processing quality and processing efficiency, the application of frequency conversion speed regulation technology to grinding machines can achieve satisfactory results, but the general VFD (Variable-frequency Drive) is less and less suitable for grinding machines due to its poor environmental resistance and other disadvantages. On-site requirements, so high-performance vector VFD (Variable-frequency Drive) with low frequency and high torque and high protection level has become the application requirement of the grinding machine site.

2. Process requirements:

A grinding machine is a machine tool that uses abrasive tools to grind the surface of a workpiece. Most grinding machines use a high-speed rotating grinding wheel to grind the workpiece. The high-speed rotating spindle is controlled by VFD (Variable-frequency Drive) and has the following requirements:

1. Low-frequency machining requires large torque. When the grinding machine performs rough machining, the spindle needs to run at a low-speed frequency. When the general-purpose VFD (Variable-frequency Drive) runs at low frequency, the torque is not large, which makes it impossible to process. Therefore, VFD (Variable-frequency Drive) is required. Drive) has low frequency and large torque characteristics

2. The spindle runs with stepless speed regulation. The spindle adjusts different operating speeds according to the requirements of the workpiece, so VFD (Variable-frequency Drive) is required to have stepless speed regulation capability

3. High precision of running speed. The high-speed rotation accuracy of the spindle directly affects the accuracy of the grinding workpiece, so the driven VFD (Variable-frequency Drive) must have high speed accuracy

4. High protection level. The grinding machine is processed in an environment with high oil pollution, high dust and high humidity. VFD (Variable-frequency Drive) is required to have a high protection level, otherwise it will cause short-circuit damage or even breakdown.

5. Small motor vibration and low noise.

3. System plan:

1. Scheme selection

According to the process requirements of the grinding machine, we choose the H600 series high-protection closed-loop vector VFD (Variable-frequency Drive), and the power of the VFD (Variable-frequency Drive) matches the power of the driven motor.

2. Introduction to VFD (Variable-frequency Drive)

Sunwoele H600 series is based on a new software and hardware platform, specially developed high-protection level closed-loop vector VFD (Variable-frequency Drive), which has the characteristics of superior performance, compact structure, complete protection functions, and rich and flexible peripheral interfaces and functions. , can adapt to various harsh environments such as humidity and dust, and can be flexibly developed for all industry applications and according to site conditions. It has the following characteristics:

· Large torque at low frequency. The closed-loop vector zero speed can reach 200% of the starting torque, and the open-loop vector zero speed can reach 180% of the starting torque

· In high-frequency operation mode, the maximum base frequency output is 1000.0Hz

Built-in a variety of system macros and application macros, which can be called by macro parameters to simplify parameter setting

The priority of frequency/speed setting channel can be flexibly configured

· Rich warning and protection functions

· High protection grade IP54, suitable for use in various harsh environments such as humidity and dust

3. Parameter debugging

Mainly set the following parameters:

4. System advantages:

Using Sunwoele H600 series high-protection level closed-loop vector VFD (Variable-frequency Drive) has the following advantages:

1. Large torque at low frequency, 0.3HZ 200% starting torque in open-loop vector mode to ensure normal processing of the system at low frequency

2. High precision of stable speed. In the open-loop vector mode, the speed accuracy is 0.2%, which ensures the precision of machining

3. The speed regulation range is wide, and the speed regulation range of 1:200 is enough to ensure stepless speed regulation

4. High-frequency output, the H600 can output up to 1000HZ frequency to ensure high-speed processing requirements

5. The protection level of IP54 can ensure the normal operation of the machine in harsh environments

5. Conclusion

Sunwoele H600 series high-protection closed-loop vector VFD (Variable-frequency Drive), based on a new hardware design platform, can adapt to various harsh environments such as humidity and dust, and effectively resist dust, oil, high humidity, acid corrosive substances and other high pollutants Damage to VFD (Variable-frequency Drive), ensuring that VFD (Variable-frequency Drive) can be used safely in extremely harsh environments, can well solve the requirements of grinding machines, and improve efficiency.