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Non-Captive Linear Stepper Motor

What is a Non-Captive Linear Stepper Motor?

A non-captive linear stepper motor is a type of electric motor that converts electrical pulses into linear motion in discrete steps. Unlike captive linear stepper motors, which feature a fixed nut or mechanical component to prevent any movement of the nut off the lead screw, non-captive linear stepper motors operate with a floating nut that can freely move along the lead screw.

In a non-captive system, the nut is not fixed within a housing and can move freely over the screw shaft as the motor rotates. This design allows for more flexible motion and enables the motor to handle various load configurations with greater versatility.

 

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.

Through-type linear stepper motor

NEMA 8 Non-Captive Linear Stepper Motor

NEMA8 (20mm) Non-Captive Linear Stepper Motor has the characteristics of small size, high performance, long durability, low noise and high efficiency. 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
BF20HSC30-0604 1.8 2 Through Screw Connector 30 0.6 6.5 1.7 1.8 4 2 0.05
BF20HSC38-0604 1.8 2 Through Screw Connector 38 0.6 9 3 2.2 4 3 0.08
Through-type linear stepper motor

NEMA 11 Non-Captive Linear Stepper Motor

NEMA11 (28mm) Non-Captive Linear Stepper Motor has the characteristics of small size, high performance, long durability, low noise and high efficiency. 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
BF28HSC32-0674 1.8 2 Through Screw Direct Wire 32 0.67 5.6 3.4 6 4 9 0.11
BF28HSC45-0674 1.8 2 Through Screw Direct Wire 45 0.67 6.8 4.9 9.5 4 12 0.14
BF28HSC51-0674 1.8 2 Through Screw Direct Wire 51 0.67 9.2 7.2 12 4 18 0.2
Through linear stepper motor

NEMA 14 Non-Captive Linear Stepper Motor

NEMA14 (35mm) Non-Captive Linear Stepper Motor has the characteristics of small size, high performance, long durability, low noise and high efficiency. Various 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
BF35HSC28-0504 1.8 2 Through Screw Direct Wire 28 0.5 20 14 10 4 11 0.13
BF35HSC34-1004 1.8 2 Through Screw Direct Wire 34 1 2.7 4.3 14 4 13 0.17
BF35HSC42-1004 1.8 2 Through Screw Direct Wire 42 1 3.8 3.5 20 4 23 0.22
Through-type linear stepper motor

NEMA 17 Non-Captive Linear Stepper Motor

NEMA17 (42mm) Non-Captive Linear Stepper Motor has the characteristics of small size, high performance, long durability, low noise and high efficiency. Various 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
BF42HSC34-1334 1.8 2 Through Screw Direct Wire 34 1.33 2.1 2.5 26 4 34 0.22
BF42HSC40-1704 1.8 2 Through Screw Direct Wire 40 1.7 1.5 2.3 42 4 54 0.28
BF42HSC48-1684 1.8 2 Through Screw Direct Wire 48 1.68 1.65 2.8 44 4 68 0.35
BF42HSC60-1704 1.8 2 Through Screw Direct Wire 60 1.7 3 6.2 7.3 4 102 0.55
Through-type linear stepper motor

NEMA 23 Non-Captive Linear Stepper Motor

NEMA23 (57mm) Non-Captive Linear Stepper Motor has the characteristics of small size, high performance, long durability, low noise and high efficiency. Various 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
BF57HSC41-2804 1.8 2 Through Screw Direct Wire 41 2.8 0.7 1.4 0.55 4 150 0.47
BF57HSC51-2804 1.8 2 Through Screw Direct Wire 51 2.8 0.83 2.2 1.01 4 230 0.59
BF57HSC56-2804 1.8 2 Through Screw Direct Wire 56 2.8 0.9 2.5 1.26 4 280 0.68
BF57HSC76-2804 1.8 2 Through Screw Direct Wire 76 2.8 1.1 3.6 1.89 4 440 1.1
BF57HSC82-3004 1.8 2 Through Screw Direct Wire 82 3.0 1.2 4.0 2.1 4 600 1.2
BF57HSC100-3004 1.8 2 Through Screw Direct Wire 100 3.0 0.75 3.0 3.0 4 700 1.3
BF57HSC112-3004 1.8 2 Through Screw Direct Wire 112 3.0 1.6 7.5 3.0 4 800 1.4

How Does a Non-Captive Linear Stepper Motor Work?

The working principle of a non-captive linear stepper motor is similar to that of other stepper motors, but with a few key differences:

1. Electrical Pulse Activation: 

The motor receives electrical pulses from a controller, energizing the motor’s coils sequentially. This creates a magnetic field that attracts or repels the rotor, causing it to rotate in small steps (typically 0.9° to 1.8° per step, depending on the motor type).

2. Movement of the Nut: 

The stepper motor’s rotational movement is transferred to a lead screw, which is a threaded shaft that engages with the nut. In the case of a non-captive linear stepper motor, the nut is free to move along the length of the lead screw without being confined to a fixed position.

3. Linear Displacement: 

As the motor turns, the nut moves incrementally along the lead screw, creating linear motion. The linear displacement corresponds to the number of steps the motor makes, with each step contributing to the total distance moved by the nut.

4. Free Nut Design: 

In a non-captive setup, the nut moves freely along the lead screw and is not confined within a housing. This design allows the nut to travel across longer distances without obstruction, providing smoother movement and flexibility in some applications.
 

Why Choose a Non-Captive Linear Stepper Motor?

Choosing a non-captive linear stepper motor offers several advantages, especially for applications requiring precision, flexibility, and cost-effectiveness. The ability to move the nut freely along the lead screw allows for longer travel distances, smoother motion, and reduced friction, while the simple design makes it a more affordable and reliable solution compared to captive systems. Additionally, the reduction in backlash and high efficiency makes non-captive motors a top choice for industries where accurate movement is a top priority.

 

Advantages of Non-Captive Linear Stepper Motors

The non-captive linear stepper motor offers several key advantages, making it a suitable option for a wide range of applications. Here are the main benefits:

1. Greater Flexibility

2. Smooth and Efficient Motion

3. Simpler Design

4. Reduced Backlash

5. Cost-Effective

 

Applications of Non-Captive Linear Stepper Motors

The non-captive linear stepper motor is suitable for a wide variety of applications, especially where precise, reliable linear motion is required. Some of the key applications include:

1. Robotics and Automation Systems

2. 3D Printing

3. Medical Devices

4. CNC Machines

5. Laboratory Equipment

6. Optical and Imaging Systems

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