Delta servo application and motor metal cutting machine

Delta servo application and motor metal cutting machine

The drive motor of the machine tool includes two types: feed servo motor and spindle servo motor. When the motor manufacturer purchases the motor, he is worried that the cutting force is not enough. The motor of a larger size is often selected, which not only increases the manufacturing cost of the machine tool, but also increases the volume, and the structural layout is not compact enough. Therefore, it is necessary to select the motor of the best specification through specific analysis and calculation.

First, the choice of feed drive servo motor

1. In principle, the servo motor should be selected according to the load conditions. There are two types of loads on the motor shaft, namely damping torque and inertia load. Both loads must be calculated correctly and their values should meet the following conditions:

1) When the machine is running at no load, the load torque applied to the servo motor shaft should be within the continuous rated torque range of the motor over the entire speed range, that is, in the continuous working area of the torque speed characteristic curve.

2) The maximum load torque, load cycle and overload time are all within the allowable range of the provided characteristic curve.

3) The torque of the motor during acceleration/deceleration should be within the acceleration/deceleration zone (or intermittent working zone).

4) For loads that require frequent starts, braking, and periodic changes, the rms value of the torque during one cycle must be checked. It should be less than the continuous rated torque of the motor.

5) The magnitude of the load inertia applied to the motor shaft will have an impact on the sensitivity of the motor and the accuracy of the entire servo system. Generally, when the load is smaller than the rotor inertia of the motor, the above influence is not large. However, when the load inertia reaches or exceeds 5 times the rotor inertia, the sensitivity and response time are greatly affected. It will even make the servo amplifier not work within the normal adjustment range. Therefore, this type of inertia should be avoided.