Standard machine tools use grinding machines and grinding wheel motors that operate according to traditional start-up circuits. After the motor is started, it runs at the rated speed. Since the grid voltage has a certain fluctuation, the friction load of the grinding wheel workpiece will constantly change, which will affect the motor speed error. The standard grinding wheel motor starting circuit generally has only one processing speed, which is difficult to adapt to different workpiece sizes and requirements. Speed, so that the processing precision of the processed workpiece is difficult to guarantee. Therefore, considering the improvement of processing quality, processing efficiency, energy conservation, etc., the application of variable frequency speed control technology to grinding machines can achieve satisfactory results.
The machining industry has a wide range of products, with different workpiece sizes and different machining accuracy. Relatively speaking, the speed of the grinding wheel is different from that of the main axis, and it is difficult to adjust the spindle speed to meet the workpiece processing speed to an ideal state. In addition, due to the bending of the stress generated during the machining of shafts, different grinding wheel feed torques are generated in the grinding process. This results in different changes in the output speed/torque of the grinding wheel, which in turn generates vibrating knife patterns, burning patterns, and the like. It is difficult to guarantee, resulting in low production efficiency and low quality.
With the development of power electronics technology, frequency control technology has become more and more popular, and inverter applications in the machining industry have received very good results. Among them, the stepless speed regulation, soft start, and constant torque output of the inverter greatly satisfy the constant speed/constant torque requirements of the machining equipment.