Question: What aspects should be paid attention to when selecting a servo motor?
Answer: 1. Some systems, such as transmission devices, lifting devices, etc. require the servo motor to stop as soon as possible, but the servo does not have regenerative braking in the event of a fault, emergency stop, or power failure, and cannot decelerate the motor. At the same time, the mechanical inertia of the system is relatively large. At this time, the dynamic brake should be selected according to the weight of the load and the working speed of the motor.
2. For some systems to maintain the static position of the mechanical device, the motor needs to provide a larger output torque and the stop time is longer. If you use the self-locking function of the servo, it will often cause the motor to overheat or the amplifier to overload. In this case, you must choose a motor with electromagnetic brake.
3. Some servo drives have a built-in regenerative braking unit, but when regenerative braking is frequent, it may cause the DC bus voltage to be too high. At this time, an additional regenerative braking resistor is required. Whether the regenerative braking resistor needs to be equipped separately and how big it is, please refer to the instructions of the corresponding sample.
4. If a servo motor with electromagnetic brake is selected, the moment of inertia of the motor will increase, so it must be considered when calculating the torque.
5. The regenerative braking frequency indicates the allowable frequency of the motor from the rated speed to decelerating to stop when the load is in the original state. In the process of selecting the servo motor, it should be noted that the braking times in the general sample list are the data when the motor is under no load. In the actual selection, first calculate the inertia ratio based on the load inertia of the system and the motor inertia on the sample. Then divide the number of braking on the sample list by (inertia ratio + 1), so that the data obtained is the allowable number of braking.
6. Ensure that the radial and axial loads added to the servo motor shaft during installation and operation are controlled within the specified values of each model, otherwise it will accelerate the wear of the servo motor, reduce the life of the motor, and even affect the required Accuracy.