Requirements for servo feed systems
1. Wide range of speed regulation
2. High positioning accuracy
3. There is sufficient transmission rigidity and high speed stability
4. Fast response, no overshoot
In order to ensure productivity and processing quality, in addition to the requirement of high positioning accuracy, it is also required to have good fast response characteristics, that is, the response of the tracking instruction signal is required to be fast, because the numerical control system is required to accelerate and decelerate large enough when starting and braking, shorten the transition process time of the feed system, and reduce the contour transition error.
5. Low speed and high torque, strong overload capacity
Generally speaking, servo drives have an overload capacity of more than 1.5 times in a few minutes or even half an hour, and can be overloaded by 4-6 times in a short time without damage.
6. High reliability
The feed drive system of CNC machine tools is required to have high reliability, good working stability, strong environmental adaptability to temperature, humidity, vibration and strong anti-interference ability.
Requirements for motors
1. From the lowest speed to the highest speed, the motor can run smoothly, and the torque fluctuation should be small, especially at low speed such as 0.1r/min or lower, there is still a stable speed without creeping.
2. The motor should have a large overload capacity for a long time to meet the requirements of low speed and high torque. Generally, DC servo motors are required to be overloaded by 4-6 times within a few minutes without damage.
3. In order to meet the requirements of fast response, the motor should have a small moment of inertia and a large stalled torque, and have the time constant and starting voltage as small as possible.
4. The motor should be able to withstand frequent starting, braking and reversal.
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