The Art of Selecting the Right Servomotor: A Comprehensive Guide
In the world of electromechanics, electric motors play a crucial role in controlling complex movements and operations. Servo motors, in particular, are at the heart of many electromechanical systems, making the choice of the right servomotor a vital consideration. In this blog post, we’ll delve into the principles of selecting the ideal servomotor for your specific needs, discuss common problems to be considered, and explore how to choose the right servomotor based on loading torque.
Principles of Selection
When selecting a servomotor, it’s essential to consider the required load requirements, as well as the technical and economic indicators such as price, weight, and volume. The traditional method of selection, often used in the past, involves considering only the engine power. However, this approach is insufficient, as it doesn’t take into account factors such as the transmission ratio and the precision calculation required for optimal performance.
A new selection method, based on the characteristics of the motor and load, provides a more comprehensive approach. This method separates the characteristics of the motor and load, representing them in a diagrammatic form. This approach offers advantages, including:
- Suitability for various load situations
- Separation of motor and load characteristics
- Reduced need for analogies when checking if the motor can handle a specific load
Problems to Consider
When selecting a servomotor, several problems arise, which must be carefully considered. These include:
- Maximum Motor Speed: The selection of the engine is primarily based on the rapid travel speed of the tool-tool, requiring strict control of the nominal motor speed.
- Inertia Matching Problem and Load Inertia Calculation: To ensure sufficient angular acceleration and stability, the JL load inertia must be limited to 2.5 times the inertia of the JM engine.
- Acceleration Torque without Load: The acceleration torque without loading occurs when the execution component accelerates from stationary to fast with a step command, and must be limited to less than 80% of the maximum output torque of the variable frequency drive system.
- Cutting Load Torque: Under normal operating conditions, the cutting load torque must not exceed 80% of the nominal engine torque.
- Continuous Overload Time: Continuous overload time must be limited to the specified overload of the engine.
Selecting a Servomotor Based on Loading Torque
According to the work curve of the servomotor, the load torque must meet the following conditions:
- When the machine tool operates in the absence of load, the load torque applied to the servomotor throughout the speed range must be within the continuous nominal torque range of the engine.
- The charging torque added to the motor shaft can be calculated.
When calculating torque, pay particular attention to the following points:
- The chosen motor shaft torque must be within the continuous work zone of the work curve.
- The reaction force (N) can be calculated, assuming there is no cup.
In conclusion, selecting the right servomotor for your specific needs requires a thorough understanding of the technical and economic indicators, as well as the problems that may arise. By considering the characteristics of the motor and load, as well as the transmission ratio and precision calculation required, you can ensure optimal performance and efficiency in your electromechanical system. Remember to carefully consider the maximum motor speed, inertia matching, acceleration torque, cutting load torque, and continuous overload time to make an informed decision.
