The servo electronic press machine is about to stand out, and the spindle drive motor of hydraulic machine tools has gone through a quite long development history from ordinary motors to multipole motors, to variable frequency motors, and to the servo electronic press machine that has just begun to become popular.
The problem is raised: ordinary motors do not have the ability to change gears, and different speed applications of machine tools need to be achieved through the cooperation of gearboxes, which are mostly used on ordinary machine tools; Multipole motors have fixed rotational speeds and are commonly used in early CNC machine tools; The combination of variable frequency motors and frequency converters enables machine tools to achieve arbitrary conversion within the speed range without the need for a gearbox, making it the main choice for CNC lathes in recent years. However, the combination of variable frequency motors and frequency converters has fatal drawbacks. At low speeds, the output torque is small (commonly known as powerless). The solution proposed by the designer is to use a gear gearbox to achieve stepless speed change within the gear range. This solution solves the problem of weak speed at low speeds. However, as the saying goes, pressing the hoist floats the ladle, and a new problem arises where the gear gearbox cannot support high speeds.
Solution: The current ultimate solution is to use a servo main motor, which solves the problems of low speed torque and high speed, and can also achieve the function of spindle indexing, which is an essential tall function for turning and milling composite machine tools! The four terms ordinary motor, variable frequency motor, frequency converter, and gearbox are bound to gradually distance themselves from the machine tool industry. Looking at the current situation of servo motors dominating the field of linear feed drive motors in machine tools, we can see the future of machine tool spindle motors.