Servo radio systems are self-contained electrical devices that are highly efficient. These servos are also precise in moving parts of a machine. You can use servo motor in various areas, such as factory automation, robotics, and CNC machines. It is critical to find the right servo motor size when planning to use it in your devices. But how can you choose the right servo drive from the many options available? Here is how you can size a servo motor and find the right one for your application.

Determine the Speed 

The velocity of your application plays an important role when choosing your servo. The speed involves knowing how fast and how far the load has to move. Understanding the motion profile and the inertia ratio will also help at this point. In applications that use repetitive motion, ensure you work out the motor speed needed in each cycle. Remember to take into account deceleration and acceleration when plotting out. If the operation is not repetitive, you only need to find out the acceleration and peak speed required. 

Know the Load and Motor

One important aspect when sizing the servo drives is to know the load. The load is also determined in terms of inertia. Inertia is the inclination of an object to resist speed changes. Thus, you should find out the inertia ratio of your application. The inertia ratio refers to the ratio of the load inertia to the motor inertia. The details of the servo motor's inertia can be found on the manufacturer's manual. But it is a bit more complicated to find the load's moment of inertia. You will need to take into account various elements such as the screws, the coupling, and the load itself. 

Find Out the Torque Level Needed

The torque is the amount of force needed to rotate the device. You can calculate your torque after knowing your speed and load. Check the torque values from the servo motor's torque-speed curve. You will need to calculate the required continuous torque, the maximum speed of the servo motor, and the peak torque. The required continuous torque should lie inside the continuous operating region of the curve. 


Getting an ideally sized servo motor for your application is not easy. Keep in mind that choosing the wrong size affects the efficiency of the servo drive. However, electrical experts can help make the process easier. These professionals will calculate all the elements needed depending on the application specifications.

To learn more, contact a resource that works with servo radio systems.