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The traditional grinding machine spindle starts running directly through the power frequency, and the spindle grinding wheel motor runs according to the traditional starting circuit. When there is a certain fluctuation of the grid voltage, it will cause a certain fluctuation of the spindle speed of the grinding wheel, which will affect the grinding machining accuracy of the workpiece. Therefore, considering the improvement of processing quality and processing efficiency, the application of variable frequency speed control technology to grinding machines can achieve satisfactory results, but general-purpose inverters are increasingly inconsistent with site requirements such as grinding machines due to their poor resistance to environmental problems. Low-frequency high-torque, high-level protection of high-performance vector inverters has become a grinding site application requirements. 
Second, the process requirements:
Grinding machine is a machine tool that grinds the workpiece surface with grinding tools. Most grinding machines use high-speed rotating grinding wheels to grind workpieces. The high-speed rotating spindles use the inverter to control the following requirements:
1. Low-frequency machining, high torque, when the grinding machine roughing, the spindle needs to run in the low-speed frequency, the common inverter low-frequency operation, the torque is not large, resulting in inability to process, so the inverter needs to have low-frequency high torque characteristics 2. Spindle Running 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 control capability 3. The running speed has high precision. Spindle high-speed rotation precision directly influences the precision of grinding workpieces, so the drive must be driven with high-speed accuracy 4. High protection level, the grinder processing environment in a high oil, high dust, high humidity environment, the inverter must have High degree of protection, otherwise it will cause short circuit damage and even blow out and other faults.
5. Small motor shake, low noise.
Third, the system program:
1. Program Selection According to the process requirements of the grinding machine, we choose J600 series high-degree of protection closed-loop vector inverter, the power of the inverter and the motor power driven by matching.
2. Inverter introduction The Quartet J600 series is based on a new software and hardware platform, specially developed high protection level closed-loop vector frequency converter, with superior performance, compact structure, complete protection functions, at the same time has a wealth of flexible peripheral interfaces and features , Can adapt to various harsh environments such as moisture, dust, etc., can be secondary development for all industrial applications and flexible according to site conditions. It has the following features:
u Low frequency torque. Closed loop vector zero speed can reach 200% starting torque, open loop vector zero speed can reach 180% starting torque u high frequency operation mode, the maximum frequency of 1000.0Hz baseband output u built-in a variety of system macros and application macros, through macro parameters Call, the most simple parameter setting u Frequency / speed setting channel priority can be flexibly configured u Rich warning and protection function u High protection class IP54, can adapt to the use of wet, dust and other harsh environments 3. Parameter debugging Main settings The following parameters:
F0.1.20=**** Set the maximum operating frequency according to system requirements F0.1.21=**** Set the maximum operating frequency according to system requirements F0.2.25=9 Analog reference frequency F0.3.33=1 Terminal given F1. 0.03=5 Acceleration and deceleration time F1.0.04=5
F1.1.13=4 carrier frequency IV. System advantages:
The use of the Quartet J600 series high-degree of protection closed-loop vector converter has the following advantages:
1. Large low-frequency torque, 0.3HZ200% starting torque in open-loop vector mode to ensure the normal processing of the system in low frequency 2. High precision of steady speed, in the open-loop vector mode, the speed accuracy is 0.2%, ensuring the processing accuracy 3. Wide speed range, 1:200 speed range is sufficient to ensure stepless speed regulation 4. High frequency output, J600 up to 1000HZ frequency output, to ensure high-speed processing requirements 5. IP54 degree of protection, to ensure that the machine is in harsh environments Under the normal operation 5, Conclusion Quartet J600 series of high-level closed-loop vector inverter, based on a new hardware design platform, can adapt to humid, dust and other harsh environments, effectively resist dust, oil, high humidity, acidic corrosive substances and other high Contamination damages the inverter and ensures safe use of the inverter in extremely harsh environments. It can solve the requirements of grinding machines and increase the efficiency. It greatly reduces the failure rate caused by harsh environment and gets the height of the grinding machine customers. Accredited.
I. Introduction: