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Captive Linear Stepper Motor

What is a Captive Linear Stepper Motor?

A captive linear stepper motor is a type of stepper motor that is specifically designed to produce linear motion rather than rotational motion. The term "captive" refers to the motor's integrated nut that is "captured" or held in place by a housing or sleeve. This design ensures that the nut moves along the lead screw but does not disengage or rotate independently, offering precise and consistent linear movement.

The stepper motor's rotor is typically energized in discrete steps, causing the attached nut to travel along the threaded lead screw, converting rotational motion into linear displacement. The captive design minimizes backlash and provides smooth and reliable motion, which is essential for applications that require high accuracy.

 

BesFoc External T-type Linear Stepper Motor

BesFoc offers four different lead screw rods, including external T-type lead screw, external ball screw, captive and non captive lead screw, linear motor sizes from neam 8 11 14 17 23 24 34.

Push rod linear stepper motor

NEMA 8 Captive Linear Stepper Motor

NEMA8 (20mm) Captive Linear Stepper Motor has the characteristics of small size, high performance, long durability, low noise and high efficiency. The nut is made of polymer material, self-lubricating and maintenance-free. At the same time, we provide a variety of motor lengths, a variety of screw leads, and a variety of screw strokes for customers to choose freely.
Optional: Connector...
Model Step Angle Phase Shaft Type Wires Body Length Current Resistance Inductance Holding Torque Leads No Rotor Inertia Weight
(°) / / / (L)mm A Ω mH N.cm No. g.cm2 Kg
BF20HSK30-0604 1.8 2 Linear Actuator Connector 30 0.6 6.5 1.7 1.8 4 2 0.05
BF20HSK38-0604 1.8 2 Linear Actuator Connector 38 0.6 9 3 2.2 4 3 0.08
Push rod linear stepper motor

NEMA 11 Captive Linear Stepper Motor

NEMA11 (28mm) Captive Linear Stepper Motor has the characteristics of small size, high performance, long durability, low noise and high efficiency. The nut is made of polymer material, self-lubricating and maintenance-free. At the same time, a variety of motor lengths, screw leads, and screw strokes are provided for customers to choose freely.
Optional: Connector...
Model Step Angle Phase Shaft Type Wires Body Length Current Resistance Inductance Holding Torque Leads No. Rotor Inertia Weight
(°) / / / (L)mm A Ω mH N.cm No. g.cm2 Kg
BF28HSK32-0674 1.8 2 Linear Actuator Direct wire 32 0.67 5.6 3.4 6 4 9 0.11
BF28HSK45-0674 1.8 2 Linear Actuator Direct wire 45 0.67 6.8 4.9 9.5 4 12 0.14
BF28HSK51-0674 1.8 2 Linear Actuator Direct wire 51 0.67 9.2 7.2 12 4 18 0.2
Push rod linear stepper motor

NEMA 17 Captive Linear Stepper Motor

NEMA17 (42mm) Captive Linear Stepper Motor has the characteristics of small size, high performance, long durability, low noise and high efficiency. The nut is made of polymer material, self-lubricating and maintenance-free. At the same time, a variety of motor lengths, screw leads, and screw strokes are provided for customers to choose freely.
Optional: Connector...
Model Step Angle Phase Shaft Type Wires Body Length Current Resistance Inductance Holding Torque Leads No. Rotor Inertia Weight
(°) / / / (L)mm A Ω mH N.cm No. g.cm2 Kg
BF42HSK34-1334 1.8 2 Linear Actuator Direct wire 34 1.33 2.1 2.5 26 4 34 0.22
BF42HSK40-1704 1.8 2 Linear Actuator Direct wire 40 1.7 1.5 2.3 42 4 54 0.28
BF42HSK48-1684 1.8 2 Linear Actuator Direct wire 48 1.68 1.65 2.8 44 4 68 0.35
BF42HSK60-1704 1.8 2 Linear Actuator Direct wire 60 1.7 3 6.2 7.3 4 102 0.55
Push rod linear stepper motor

NEMA 23 Captive Linear Stepper Motor

NEMA23 (57mm) Captive Linear Stepper Motor has the characteristics of small size, high performance, long durability, low noise and high efficiency. The nut is made of polymer material, self-lubricating and maintenance-free. At the same time, a variety of motor lengths, screw leads, and screw strokes are provided for customers to choose freely.
Optional: Connector...
Model Step Angle Phase Shaft Type Wires Body Length Current Resistance Inductance Holding Torque Leads No. Rotor Inertia Weight
(°) / / / (L)mm A Ω mH Nm No. g.cm2 Kg
BF57HSK41-2804 1.8 2 Linear Actuator Direct wire 41 2.8 0.7 1.4 0.55 4 150 0.47
BF57HSK51-2804 1.8 2 Linear Actuator Direct wire 51 2.8 0.83 2.2 1.01 4 230 0.59
BF57HSK56-2804 1.8 2 Linear Actuator Direct wire 56 2.8 0.9 2.5 1.26 4 280 0.68
BF57HSK76-2804 1.8 2 Linear Actuator Direct wire 76 2.8 1.1 3.6 1.89 4 440 1.1
BF57HSK82-3004 1.8 2 Linear Actuator Direct wire 82 3.0 1.2 4.0 2.1 4 600 1.2
BF57HSK100-3004 1.8 2 Linear Actuator Direct wire 100 3.0 0.75 3.0 3.0 4 700 1.3
BF57HSK112-3004 1.8 2 Linear Actuator Direct wire 112 3.0 1.6 7.5 3.0 4 800 1.4

How Does a Captive Linear Stepper Motor Work?

The operation of a captive linear stepper motor involves several key components that work together to produce precise linear movement:

1. Stepper Motor Activation: 

The stepper motor is an electric motor that operates in discrete steps. It is energized by a controller that sends electrical pulses to the motor’s coils, generating a rotating magnetic field. This magnetic field attracts and repels the rotor, causing it to move in precise, small increments.

2. Lead Screw and Nut: 

The lead screw is a threaded shaft that interacts with the nut, which is captured within the motor housing. As the motor rotates, the nut travels along the lead screw. The nut is fixed in place within the housing, meaning it cannot rotate freely but instead moves linearly with each step the motor takes.

3. Linear Motion: 

Each electrical pulse moves the nut along the lead screw by a fixed distance, resulting in precise linear displacement. The stepper motor's ability to move in discrete steps ensures that the nut moves at exact intervals, allowing for accurate and repeatable positioning.

4. Backlash Control: 

The captive design reduces or eliminates backlash, which can occur in non-captive systems where the nut can potentially slip or rotate independently. The captive nut is held in place, ensuring accurate and repeatable motion.

5. Efficiency and Smoothness: 

The integration of the lead screw and nut with the stepper motor provides high efficiency with minimal friction. The combination of these elements results in smooth, reliable movement, even under heavy loads.
 

Why Choose a Captive Linear Stepper Motor?

The captive linear stepper motor is an ideal choice for applications that demand precision, reliability, and minimal backlash. Its simple, yet effective design ensures that you get accurate, repeatable movement with reduced friction, making it well-suited for industries such as CNC machining, robotics, 3D printing, and medical devices. The high load capacity, smooth motion, and easy integration make it a versatile solution for a wide range of motion control applications.

 

Advantages of Captive Linear Stepper Motors

The captive linear stepper motor offers several advantages, particularly in applications that require high precision, reliability, and control. Some of the key benefits include:

1. High Precision and Accuracy

2. Minimal Backlash

3. Reliable and Smooth Motion

4. High Load Capacity

5. Easy Integration

 

Applications of Captive Linear Stepper Motors

Captive linear stepper motors are ideal for applications that require precise control, smooth motion, and reliable performance. Below are some common industries and uses for these motors:

1. CNC Machines

2. 3D Printing

3. Robotics

4. Medical Equipment

5. Automated Manufacturing Systems

6. Laboratory Equipment

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