Engraving machine
close In numerical control machine tools, the motorized spindle usually adopts the method of variable frequency speed regulation. There are mainly three control modes: ordinary frequency conversion drive and control, vector control drive and control, and direct torque control. The common frequency conversion is scalar drive and control, and its drive control characteristic is constant torque drive, and the output power is proportional to the speed. The dynamic performance of ordinary frequency conversion control is not ideal, the control performance is poor at low speed, the output power is not stable enough, and the C-axis function is not available. But it is cheap and simple in structure, and is generally used for grinders and ordinary high-speed milling machines. The vector control technology imitates the control of DC motor, orients the rotor field, and realizes the drive and control by means of vector transformation, which has good dynamic performance. The vector control driver has a large torque value when it is just started. In addition, the motorized spindle itself has a simple structure and a small inertia, so the starting acceleration is large, and it can achieve the allowable limit speed instantaneously after starting. This kind of driver has open loop and closed loop. The latter can realize the feedback of position and speed, which not only has better dynamic performance, but also can realize the C-axis function; The former has poor dynamic performance and no C-axis function, but it is cheaper. Direct torque control is another new high-performance AC speed regulation technology developed after the vector control technology. Its control idea is novel and the system structure is simple and clear, which is more suitable for the drive of high-speed motorized spindle, and can better meet the requirements of high-speed motorized spindle's dynamic and static characteristics of high speed, wide speed range, and high-speed instant stop, It has become a hot technology in the field of AC drive. Scope of application: granite, marble, bluestone, sandstone and other stones Carving granite and other hard stones can be carved to 5mm in layers Marble, bluestone and other stones can be carved to 5mm at a time