Description

NEMA 8 Non-Captive Stepper Motor is a high-performance linear stepper motor specifically designed for miniature automation equipment, precision instruments, and compact mechanical systems. Its unique non-captive design allows the motor to achieve precise linear motion and high repeatability within limited installation spaces. By directly coupling the stepper motor with a lead screw, the NEMA 8 Non-Captive Stepper Motor eliminates the need for external push rods or guiding mechanisms, making it an ideal solution for applications where space efficiency, motion accuracy, and reliability are critical. It is widely used in miniature robots, 3D printers, laboratory automation systems, medical devices, and other high-precision applications.

In terms of manufacturing, the NEMA 8 Non-Captive Stepper Motor incorporates precision-wound copper coils and a laminated stator-rotor structure made from high magnetic permeability silicon steel, ensuring high efficiency and low heat generation. The non-captive shaft and guide rod are manufactured from premium alloy materials and undergo precision machining and surface treatment processes to achieve low friction, long service life, and smooth operation. Each motor undergoes comprehensive quality inspections, including thrust testing, noise testing, and life-cycle testing, ensuring stable and reliable performance during continuous operation.

NEMA 8 Non-Captive Stepper Motor – Technical Specifications

General Information

Product Model: NEMA 8 Non-Captive Stepper Motor
Motor Type: Miniature Non-Captive Linear Stepper Motor
Step Angle: 1.8° (supports micro-stepping for high-precision positioning)
Flange Size: 20 mm × 20 mm
Motor Length: 15 mm – 35 mm (depending on lead screw travel and drive configuration)

Lead Screw Specifications

Lead Screw Type: Non-captive linear actuator design
Lead Screw Options: Standard lead screw or ball screw
Lead Screw Diameter: 2 mm
Lead Screw Lead (Pitch):
- 2 mm
- 3 mm
- 4 mm
- Custom options available
Lead Screw Length Options:
- 10 mm
- 20 mm
- 30 mm
- 40 mm
- 50 mm
- Custom lengths available

Electrical Specifications

Rated Voltage: 12V DC / 24V DC
Drive Current: 0.3 A – 0.8 A (adjustable according to load requirements)
Motor Winding: High-purity enamel-coated copper wire combined with laminated silicon steel stator and rotor construction
Insulation Class: Class B

Motion Performance

No-Load Linear Speed: 2 – 120 mm/s (depending on lead screw lead and drive mode)

Maximum Static Thrust Force

2 mm Lead: Up to 15 N
3 mm Lead: Up to 22 N
4 mm Lead: Up to 30 N
Maximum Stroke Length: Determined by screw length; typically up to 50 mm (longer strokes available upon request)

Bearing & Lubrication System

Bearing Type: High-precision rolling bearings
Lubrication System: Long-life lubrication design for reduced friction and smooth operation

Operating Characteristics

Low noise operation
Low vibration performance
High repeatability and positioning accuracy
Suitable for continuous long-term operation

Drive Modes

Open-loop stepper control
Closed-loop stepper control (optional encoder feedback available)

Environmental Specifications

Operating Temperature: -20°C to +50°C
Protection Rating: IP20
Optional Version: Sealed enclosure available for industrial and laboratory environments