A captive linear stepper motor is a specialized type of stepper motor designed to generate linear motion instead of rotational motion. The term "captive" indicates that the motor features an integrated nut that is securely held in place by a housing or sleeve. This design ensures that the nut moves along the lead screw while preventing it from disengaging or rotating independently, which enables precise and consistent linear movement.
In a captive linear stepper motor, the rotor is energized in discrete steps, which causes the attached nut to traverse along the threaded lead screw, effectively converting rotational motion into linear displacement. The captive configuration reduces backlash and ensures smooth and reliable motion, making it ideal for applications that demand high precision.
Jkongmotor offers a variety of lead screw options, which include:
Additionally, Jkongmotor provides linear motors available in various sizes, including Nema sizes 8, 11, 14, 17, 23, 24, and 34.
| Model | Step Angle | Phase | Shaft Type | Wires | Body Length | Current | Resistance | Inductance | Holding Torque | Leads No | Rotor Inertia | Weight |
| (°) | / | / | / | (L)mm | A | Ω | mH | g.cm | No. | g.cm2 | Kg | |
| JK20HSK30-0604 | 1.8 | 2 | Linear Actuator | Connector | 30 | 0.6 | 6.5 | 1.7 | 180 | 4 | 2 | 0.05 |
| JK20HSK38-0604 | 1.8 | 2 | Linear Actuator | Connector | 38 | 0.6 | 9 | 3 | 220 | 4 | 3 | 0.08 |
| Model | Step Angle | Phase | Shaft Type | Wires | Body Length | Current | Resistance | Inductance | Holding Torque | Leads No. | Rotor Inertia | Weight |
| (°) | / | / | / | (L)mm | A | Ω | mH | g.cm | No. | g.cm2 | Kg | |
| JK28HSK32-0674 | 1.8 | 2 | Linear Actuator | Direct wire | 32 | 0.67 | 5.6 | 3.4 | 600 | 4 | 9 | 0.11 |
| JK28HSK45-0674 | 1.8 | 2 | Linear Actuator | Direct wire | 45 | 0.67 | 6.8 | 4.9 | 950 | 4 | 12 | 0.14 |
| JK28HSK51-0674 | 1.8 | 2 | Linear Actuator | Direct wire | 51 | 0.67 | 9.2 | 7.2 | 1200 | 4 | 18 | 0.2 |
| Model | Step Angle | Phase | Shaft Type | Wires | Body Length | Current | Resistance | Inductance | Holding Torque | Leads No. | Rotor Inertia | Weight |
| (°) | / | / | / | (L)mm | A | Ω | mH | kg.cm | No. | g.cm2 | Kg | |
| JK42HSK34-1334 | 1.8 | 2 | Linear Actuator | Direct wire | 34 | 1.33 | 2.1 | 2.5 | 2.6 | 4 | 34 | 0.22 |
| JK42HSK40-1704 | 1.8 | 2 | Linear Actuator | Direct wire | 40 | 1.7 | 1.5 | 2.3 | 4.2 | 4 | 54 | 0.28 |
| JK42HSK48-1684 | 1.8 | 2 | Linear Actuator | Direct wire | 48 | 1.68 | 1.65 | 2.8 | 5.5 | 4 | 68 | 0.35 |
| JK42HSK60-1704 | 1.8 | 2 | Linear Actuator | Direct wire | 60 | 1.7 | 3 | 6.2 | 7.3 | 4 | 102 | 0.55 |
| 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 | |
| JK57HSK41-2804 | 1.8 | 2 | Linear Actuator | Direct wire | 41 | 2.8 | 0.7 | 1.4 | 0.55 | 4 | 150 | 0.47 |
| JK57HSK51-2804 | 1.8 | 2 | Linear Actuator | Direct wire | 51 | 2.8 | 0.83 | 2.2 | 1.0 | 4 | 230 | 0.59 |
| JK57HSK56-2804 | 1.8 | 2 | Linear Actuator | Direct wire | 56 | 2.8 | 0.9 | 3.0 | 1.2 | 4 | 280 | 0.68 |
| JK57HSK76-2804 | 1.8 | 2 | Linear Actuator | Direct wire | 76 | 2.8 | 1.1 | 3.6 | 1.89 | 4 | 440 | 1.1 |
| JK57HSK82-3004 | 1.8 | 2 | Linear Actuator | Direct wire | 82 | 3.0 | 1.2 | 4.0 | 2.1 | 4 | 600 | 1.2 |
| JK57HSK100-3004 | 1.8 | 2 | Linear Actuator | Direct wire | 100 | 3.0 | 0.75 | 3.0 | 2.8 | 4 | 700 | 1.3 |
| JK57HSK112-3004 | 1.8 | 2 | Linear Actuator | Direct wire | 112 | 3.0 | 1.6 | 7.5 | 3.0 | 4 | 800 | 1.4 |
The functioning of a captive linear stepper motor involves several integral components that collaboratively produce precise linear movement:
The stepper motor is an electric motor that operates in discrete steps. A controller energizes the motor by sending electrical pulses to its coils, creating a rotating magnetic field. This magnetic field then attracts and repels the rotor, causing it to move in precise, small increments.
The lead screw is a threaded shaft that interfaces with the nut, which is securely held within the motor housing. As the motor rotates, the nut travels along the lead screw. Since the nut is fixed in the housing, it cannot rotate freely; it instead moves linearly with each incremental step taken by the motor.
Each electrical pulse commands the nut to progress along the lead screw by a predetermined distance. This results in accurate linear displacement, and the ability of the stepper motor to move in defined steps ensures that the nut is positioned with precision and repeatability.
The captive design effectively reduces or eliminates backlash—an issue that can occur in non-captive systems where the nut might slip or rotate independently. By securing the nut in place, the system guarantees accurate and consistent motion throughout its operation.
The synergy of the lead screw and nut with the stepper motor yields high efficiency with minimal friction. This combination allows for smooth and reliable movement, even when subjected to substantial loads.
A captive linear stepper motor is an excellent selection for applications that require high precision, reliability, and minimal backlash. Its straightforward yet effective design ensures accurate, repeatable motion with reduced friction, making it ideal for sectors like CNC machining, robotics, 3D printing, and medical devices. The motor’s high load capacity, smooth operational capabilities, and ease of integration also make it a versatile option for a broad range of motion control applications.
The captive linear stepper motor offers several advantages, particularly in applications that require high precision, reliability, and control. Some of the key benefits include:
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:
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