As key components of machine tools, the performance of servo motors and spindle motors largely determines the final performance of the machine tool. But what are the specific differences between these two types of motors?
In terms of application, servo motors are mainly responsible for the machine tool's feed, moving the workpiece towards the tool or vice versa, primarily for cutting operations, and have high requirements for torque and control precision . Spindle motors, on the other hand, are mainly responsible for driving the machine tool's spindle, rotating the workpiece or tool head, and have high requirements for constant power output characteristics, ensuring sufficient torque output at different speeds . Therefore, during the design process, these two types of motors undergo targeted parameter optimization based on their respective application requirements.
1. Requirements for the mechanical characteristics of the servo motor: The servo motor should have a small speed drop, be able to maintain constant torque output within a certain speed range , and have high static stiffness.
2. High-speed control response is required : This is mainly in contour machining, especially when machining objects with large curvature at high speed, where there are very strict requirements on the speed and torque control response time of the servo motor.
3. The motor itself has a wide speed range : it can be used to adapt to various cutting tools and workpiece materials of CNC machine tools, and can adapt to various processing techniques.
4. Capable of overload torque output and constant torque output : The mechanical load of machine tool feed (servo motor) is mainly to overcome the friction of the worktable and the resistance of cutting, so it is mainly of the nature of "constant torque", and at the same time, it must be able to have short-term torque overload capability. For example, the overload capability of mainstream servo motors on the market can reach 3 times or even more.
Maxsine® servo motors
1. Sufficient Output Power: The spindle load characteristic of CNC machine tools is approximately "constant power," meaning that when the spindle speed is high, the output torque is low; when the spindle speed is low, the output torque is high , ensuring that the spindle has sufficient drive power under different working conditions. This requires the spindle drive unit (spindle motor) to have a "constant power" characteristic output curve.
Constant power output curve of spindle motor
2. Speed Range: To ensure that CNC machine tools are suitable for various cutting tools and machining materials, and adaptable to various machining processes, the spindle motor is required to have a certain speed range . However, the requirements for the spindle are lower than those for the feed motor.
3. Speed accuracy: Generally, a static error of less than 5% is required, with a higher requirement of less than 1%.
4. Speed: The spindle drive is sometimes used for positioning, which requires it to also have a certain degree of speed.
spindle motor
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