Motor Selection Parameters for Ball Screw Actuators
📌 Key parameters for motor selection include required driving torque, desired rotational speed, and the necessary accuracy of motor rotational angle.
⚙️ The driving torque calculation primarily depends on the axial load (F) and the ball screw lead (P), using the formula $T = \frac{F \cdot P}{2000 \cdot \pi \cdot \eta}$.
📊 For the specific example (Axial Load = 680 N, Lead = 10 mm, efficiency $\eta \approx 80\%-90\%$), the calculated driving torque is 1.95 Newton-meter (Nm).

Motor Type Selection Rationale
🤖 For high accuracy and control requirements, a servo motor is generally recommended, although it is more costly.
⚙️ If high precision is not critical, a stepper motor can be chosen as a less expensive alternative.
🗣️ It is crucial to consult with an electrical design engineer as they better understand the application's programming and control needs.

Servo Motor Catalog Review and Final Selection
⭐ After calculating the required speed as 2400 RPM, a servo motor was selected based on catalog data.
📈 The initial rated torque of 1.91 Nm was deemed too close; therefore, a motor with a rated torque of 2.39 Nm was chosen by applying a safety factor.
💡 The selected motor (Model SGM7J-08A) has a rated speed of 3,000 RPM, which accommodates the required 2400 RPM.

Key Points & Insights
➡️ The driving torque calculation for a ball screw actuator relies heavily on axial force and lead size, independent of the rotational speed.
➡️ Always overspecify the motor torque (using a safety factor) above the calculated requirement to ensure system reliability, leading to a selection of 2.39 Nm over the required 1.95 Nm.
➡️ The final motor choice (servo vs. stepper) balances cost against the required positioning accuracy, necessitating collaboration between mechanical and electrical design teams.

📸 Video summarized with SummaryTube.com on Nov 20, 2025, 02:39 UTC