Is the A6 Series Servo Motor Suitable as a Spindle Motor?

When considering a servo motor for spindle applications, the following points need to be evaluated:

• Application Speed: The rated speed of the A6 series servo motor is 3000 RPM. Although its peak speed can reach 6000 RPM, it is difficult to achieve the high speeds commonly seen in traditional spindle motors (typically 8000-24000 RPM or even higher). Therefore, using a servo motor as a spindle is clearly unsuitable for finishing operations on materials like aluminum alloys or composites that require high rotational speeds and light cutting loads.

• Dynamic Response and Machining Accuracy: Servo motors excel at precise control of the rotational axis angle. This is crucial for applications such as rigid tapping, thread milling, index milling (e.g., milling hexagons), and online measurement – tasks where traditional asynchronous spindle motors struggle to achieve such high-precision angular control. In these specific scenarios, using a servo motor as the spindle is a excellent choice.

• Power and Cost: Servo motors of the same power rating are generally more expensive and potentially larger in size than asynchronous motors. For high-power spindle applications (e.g., above 20kW), the cost of using a servo motor becomes very high. Furthermore, the maximum power of the current A6 series servo motor is only 1kW. If power rating and cost are primary concerns, using a servo motor is not recommended.

• Low-Speed, High-Torque Applications: Servo motors provide constant torque across their speed range. This means the A6 motor can deliver its rated torque from 0 to 3000 RPM. Consequently, for machining operations requiring high torque at low speeds – such as large-diameter thread milling or heavy cutting at low speeds – a servo motor is an excellent choice as the spindle, avoiding the low-torque issues common in traditional spindle motors at low RPM.

In summary, selecting an A6 series servo motor as a spindle motor requires careful consideration of the specific application requirements and cost constraints. STEPPERONLINE also offers traditional spindle motors, which you can explore here:

https://www.omc-stepperonline.com/cnc-spindle-motor

Updated on: 29/09/2025