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In machine tool processing, the frequency conversion speed regulation method is usually used for motorized spindle. At present, there are three main control modes: common frequency conversion drive and control, vector control technology control and direct torque control.



Common frequency conversion is scalar drive and control. Its drive and control characteristics are constant torque drive. The output power is proportional to the speed. The dynamic performance of the common frequency conversion control is not ideal, the control performance is not good at low speed, the output power is not stable, and the C-axis function is not available. But the price is cheap and the structure is simple. It is generally used in grinders and ordinary high-speed milling machines.



Vector control technology imitates the control of DC motor, uses rotor field orientation and vector transformation to realize drive and control, and has good dynamic performance. Vector control driver has a large torque value when it is just started. In addition, the motorized spindle itself has simple structure and small inertia. Therefore, the starting acceleration is high and the allowable limit speed can be achieved instantaneously after starting. This kind of driver has two kinds of open-loop and closed-loop, the latter can realize the feedback of position and speed, not only has better dynamic performance, but also can realize the function of C-axis, while the former has a slightly poor dynamic performance and does not have the function of C-axis.



Direct Torque Control (DTC) is a new high-performance AC speed regulation technology developed after vector control technology. Its control idea is novel, the system structure is concise and clear, and it is more suitable for driving high-speed motorized spindle. It can meet the requirements of dynamic and static characteristics of high-speed motorized spindle with high speed, wide speed range and high-speed instantaneous quasi-stop. It has become the field of AC drive. A hot technology.