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Lead Screw Linear Stepper Motor | Precision Linear Actuator

Core Features: High-precision lead screw linear stepper motor available in captive, non-captive, and external structural designs (optional ball screw).

Performance Highlights:

Ultra-High Accuracy: Achieves up to 0.1 μm positioning accuracy.
Safety & Control: Features power-off self-locking and supports both open-loop and closed-loop control.
Key Applications: Ideal for automation, semiconductor manufacturing, medical devices, 3D printing, and laboratory precision positioning.

Category: Lead Screw Motors

Description
Technical Parameters

High-precision lead screw linear stepper motor with captive/non-captive/external structure, 0.1μm positioning accuracy, power-off self-locking, ball screw optional, open/closed loop control for automation, semiconductor, medical, 3D printing & lab precision positioning

Lead Screw Linear Stepper Motor, also named screw-driven linear stepper actuator, is a compact integrated electromechanical actuator that converts electromagnetic pulse signals into precise linear displacement. It was first patented in 1968, combining hybrid stepper motor core and precision lead screw transmission assembly as an all-in-one linear motion unit, eliminating complicated external connecting components like couplings, belts and transmission frames.

We supply 3 mainstream mechanical configurations: through-shaft (captive), external drive (non-captive), fixed shaft, covering standard frame sizes: 20mm, 28mm, 35mm, 42mm(NEMA17), 57mm(NEMA23), 86mm(NEMA34). The meshing parts adopt self-lubricating POM/polyacetal wear-resistant materials; upgraded ball screw version delivers ultra-high transmission efficiency and rigidity.

Available in open-loop stepping drive and integrated closed-loop smart linear stepper motor (built-in encoder, driver & controller, bus communication supported). Widely adopted for micro & industrial precision linear positioning scenarios, delivering stable, repeatable linear movement without extra mechanical linkage design.

Working Principle & Performance Specification

1. Core Operating Principle

The stator winding receives pulse electrical signals to generate alternating magnetic fields, driving the permanent magnetic rotor to rotate step by step;
Rotational motion is converted into axial linear displacement via screw-nut meshing pair;
Anti-rotation limit structure (keyway/spline) prevents relative rotation between screw and nut, so rotational force is fully converted into straight-line travel.

Three structural motion logic:

Through-shaft (Captive): Nut is embedded inside the motor rotor and rotates synchronously, pushing the lead screw to perform linear reciprocating motion;
External Drive (Non-Captive): Lead screw is fixed on the motor output shaft and rotates with the rotor, the external nut slides linearly along the screw rod;
Fixed Shaft Type: Rotor meshes with the fixed lead screw via internal thread, end cover keyway restricts screw rotation, only pure axial linear output is realized.

2. Self-Locking Mechanism (Core Technical Highlight)

The spiral thread of the lead screw is unfolded into an inclined plane in mechanical theory. Power-off self-locking takes effect when thread lead angle ≤ equivalent friction angle. Once the condition is satisfied, axial external load cannot drive the screw to reverse rotation, realizing stable position retention after power cut without additional brake accessories.

3. Key Performance Indicators

Performance Item	Technical Parameter	Advantage Explanation
Positioning Accuracy	Up to 0.1μm	Ultra-fine micro positioning, zero interpolation lag
Max Linear Speed	300m/min	Fast response, high dynamic operation
Max Acceleration	10g	Rapid start & stop for high-cycle automation
Ball Screw Transmission Efficiency	≥90%	Driving torque only 1/3 of trapezoidal lead screw, energy-saving
Screw Hardness (Ball Screw)	HRC58+	Heat treatment enhanced, wear-resistant & long service life
Internal Groove Design	Gothic arch groove	Tiny axial backlash, smooth running, preload adjustable for higher rigidity
Nut Material	Self-lubricating POM/Polyacetal	Low friction coefficient, maintenance-free

4. Driving Mode Options

Basic micro stepper: Single voltage drive, dual voltage drive, high-low voltage drive (matched with dedicated stepper drivers);
Closed-loop integrated smart version: Encoder + driver + controller all-in-one, supports EtherCAT/field bus multi-axis network synchronous control.

Core Advantages

✅ Ultra-high positioning accuracy up to 0.1μm for micro precision operation

✅ Built-in power-off self-locking function to ensure safe positioning

✅ Rich specifications: 20mm, 28mm, 35mm, 42mm, 57mm, 86mm series

✅ Optional ball screw, closed-loop control and customized solutions

✅ Multiple driving modes and dedicated drivers for stable operation

✅ High wear resistance, low noise and strong operational stability

Application

Industrial Automation & CNC Equipment
Automatic assembly lines, CNC machine tool feeding axes, automated fixture positioning, small sliding tables, automated testing jigs
3D Printing & Additive Manufacturing
3D printer Z-axis lifting platform, printing head precise feeding, resin layer thickness adjustment
Medical Equipment
Infusion pump flow regulation, ophthalmic precision adjustment, medical sampling pipetting devices, rehabilitation equipment micro drive
Semiconductor & Microelectronics Industry
Wafer transfer displacement platform, chip testing positioning, 3C electronic precision detection, micro component assembly
Optical Inspection & Precision Instrument
Optical lens focusing adjustment, spectral detection platform, microscopic displacement stage, laser calibration equipment
University Labs & Scientific Research
Physics experiment displacement platform, material testing stretching equipment, micro mechanical measurement instruments
Robotics & Precision Machinery
Small collaborative robot joint drive, robotic end effector linear push-pull mechanism, miniature electric cylinders

1. What Are the Benefits of Using Screw Drive Motors in Automation?

Key Differences:

Motion Conversion:
- Screw Drive Motors: Convert rotary motion into precise linear motion using a screw thread, ideal for applications requiring high accuracy.
- Regular Motors: Typically provide only rotary motion and require additional mechanisms (like gears or belts) to achieve linear motion.
Precision & Load Handling:
- Screw Rod Motors: Offer exceptional precision (up to ±0.01mm) and handle heavy loads efficiently, making them perfect for CNC machines, robotic arms, and automated production lines.
- Regular Motors: Generally less precise and may struggle with high-torque applications.
Energy Efficiency:
- Screw Drive Motors: Due to the ball screw mechanism, friction is minimized, leading to greater energy efficiency and lower operational costs.
- Regular Motors: Higher friction can reduce energy efficiency, especially in heavy-duty applications.
Maintenance:
- Screw Drive Motors: Designed for low maintenance and longer life due to reduced friction.
- Regular Motors: Require more maintenance, especially when used with additional gear systems for linear motion.

Applications:

Screw Drive Motors: Perfect for precision applications like CNC machining, 3D printing, and robotics.
Regular Motors: Suitable for simpler applications without high precision requirements.

Conclusion:

For industries demanding high precision, efficiency, and load capacity, screw drive motors provide superior performance over regular motors. Upgrade your automation systems with screw drive technology for better efficiency, lower maintenance, and higher precision.

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2. How Do Screw Drive Motors Work Compared to Regular Motors?

Answer:
Screw drive motors convert rotary motion into linear motion through the use of a screw thread, offering high precision and load-handling capacity. In contrast, regular motors only provide rotary motion and require additional mechanisms like gears or belts to achieve linear motion. Screw drive motors are more efficient, have lower friction, and require less maintenance, making them ideal for high-precision applications in automation systems.

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3. What Are the Key Advantages of Ball Screw Motors in Industrial Applications?

Answer:
Ball screw motors offer several key advantages:

High precision: Ideal for tasks requiring accurate linear movement (up to ±0.01mm).
Energy efficiency: The ball screw design minimizes friction, improving efficiency and reducing energy costs.
Heavy load capacity: Perfect for applications like robotic arms and industrial assembly lines.
Low maintenance: Reduced wear means fewer repairs and longer-lasting components.
These advantages make ball screw motors highly reliable for industrial automation and advanced manufacturing.

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4. Can Screw Drive Motors Be Used in Robotic Arms?

Answer:
Yes, screw drive motors are commonly used in robotic arms due to their precise linear motion capabilities. They provide the accuracy and high load capacity required for applications like pick-and-place, welding, and assembly tasks. The ball screw mechanism ensures smooth, controlled movements and minimizes friction, leading to longer lifespan and higher reliability in robotic systems.

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5. What Is the Difference Between a Screw Drive Motor and a Servo Motor?

Answer:
While both screw drive motors and servo motors offer precise control, the key difference lies in their application:

Screw drive motors convert rotary motion into linear motion, making them ideal for linear positioning in systems like CNC machines and 3D printers.
Servo motors, on the other hand, are typically used for rotary motion and provide continuous control of rotational speed and position.

In automated systems that require linear motion, screw drive motors provide superior precision and load capacity compared to servo motors.

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6. What Are the Common Applications for Screw Drive Motors in Automation?

Answer:
Screw drive motors are commonly used in:

CNC machines for precise material machining.
Robotic arms for accurate handling and assembly.
3D printers for precise control of the print head.
Automated assembly lines for precise component placement.
Their ability to handle heavy loads while providing precise linear motion makes them versatile in a wide range of industrial automation applications.

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7. How Do Ball Screw Motors Improve CNC Machining?

Answer:
Ball screw motors are essential in CNC machining because they provide ultra-precise movement with minimal friction. This leads to improved accuracy and repeatability, allowing machines to produce parts with high precision (±0.01mm). The ball screw mechanism also enhances energy efficiency and extends the lifespan of the machine, reducing maintenance costs and downtime.

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8. What Maintenance Is Required for Screw Drive Motors?

Answer:
Screw drive motors are designed for low maintenance thanks to the ball screw mechanism, which reduces wear and friction. However, regular checks are recommended to ensure smooth operation. Key maintenance tasks include:

Lubrication: Ensure proper lubrication to maintain smooth movement and reduce wear.
Inspection: Check for any misalignment, wear on the screw threads, or debris accumulation.
Cleaning: Keep components free of dust and debris for optimal performance.

Because they require less maintenance than other motor types, screw drive motors are a cost-effective solution in automation systems.

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9. What Is the Load Capacity of Screw Drive Motors?

Answer:
Screw drive motors are known for their high load capacity, making them suitable for heavy-duty applications. Depending on the design and size, these motors can handle significant loads, making them ideal for tasks like robotic arms, automated assembly lines, and CNC machining. The ball screw mechanism improves load handling and torque transmission, ensuring reliable performance under demanding conditions.

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10. How Can Screw Drive Motors Improve Energy Efficiency in Automation?

Answer:
Screw drive motors, especially ball screw motors, reduce friction due to their design, which leads to lower energy consumption. This makes them more energy-efficient than traditional motors, especially in high-load applications. The reduced friction means less power is needed to perform tasks like linear motion in CNC machines, robotic arms, and 3D printers, resulting in cost savings and sustainable operations

Description	Lead Screw Linear Motion Actuator
Model	28Series, 35 Series, 42 Series, 57 Series
Voltage	2.4V
Current(A)	3.0
Resistance	2.0±10%
Inductance (mH)	5.2±20%
Length(mm)	45