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Ordinary machine tool to CNC machine tool how to choose servo motor?

SummaryServo system is an important part of CNC machine tool, which is not only the information transmission link between CNC system, tool and spindle, but also the link of energy amplification and transmission.

Ordinary machine tool to CNC machine tool how to choose servo motor?

SummaryServo system is an important part of CNC machine tool, which is not only the information transmission link between CNC system, tool and spindle, but also the link of energy amplification and transmission.

Servo system is an important part of CNC machine tool, which is not only the information transmission link between CNC system, tool and spindle, but also the link of energy amplification and transmission. Its performance determines the performance of CNC machine tools to a large extent. For example, the highest moving speed, tracking accuracy, positioning accuracy and other important indicators of CNC machine tools depend on the dynamic and static performance of the servo system. The servo system is divided into three types according to the control mode: open loop control system, semi-closed loop control system and closed loop control system. In the NC transformation of ordinary machine tools, the open loop control system with lower price is generally selected. The actuator of the system, servo motor, usually adopts stepper motor or permanent magnet AC servo motor.

The stepper motor is controlled by the pulse digital signal, and the step error automatically becomes zero at each turn, which is easy to control and has the lowest price. The key to its selection is to determine the parameters. The specific method to determine the parameters is: first calculate the step Angle of the motor, then determine its step accuracy, and then select its torque, and finally select the stepper motor driver.

Permanent magnet AC servo motor is commonly used in feed drive system, it has large capacity, simple structure, reliable operation and high efficiency, but the starting characteristic is not good. The selection method is: first determine the rated speed of the motor, then select its load inertia, and then determine its rated torque, the motor pre-selection, and finally through further speed, acceleration and deceleration torque and continuous working torque checking calculation to determine whether the pre-selected motor meets the requirements.
 

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