Hollow Shaft Stepper Motor Nema 17 42mm- Suzhou Retek Electric Technology Co., Ltd.

Hollow Shaft NEMA 17 Stepper: Feed-Through Integration

The Hollow Shaft NEMA 17 Stepper Motor (42mm frame) features a bore running entirely through the center of the motor rotor and shaft.

This unique design is essential for applications requiring the routing of cables, pneumatic lines, laser beams, or fluids through the rotation axis. Mechanically, the motor retains the high-precision indexing and holding torque characteristics of a standard NEMA 17 hybrid stepper. The integration of a hollow shaft eliminates the need for complex, bulky external cable management (like slip rings), simplifying machine design and improving reliability in rotary stages and actuators.

Introduction

Detailed Parameters and Performance Data

RETEK: Optimized for Direct Energy and Signal Routing

Suzhou Retek Electric Technology Co., Ltd. provides the hollow shaft series with guaranteed concentricity between the bore and the rotational axis. This precision is critical for maintaining step accuracy and minimizing vibration when cables or optical components are passed through. Our manufacturing process ensures that the internal routing channel is smooth and free of burrs, preventing cable abrasion during rotation. This specialty stepper is ideal for highly integrated, dynamic systems.

Applications

Advanced Technology Highlights

Unique Integration Applications for Hollow Shaft Steppers

3D Printing Extruder Heads: Routing filament, cooling tubes, or heating wires directly through the motor. Challenge: Minimizing drag and maximizing space utilization.
Laser Welding/Cutting Heads: Passing the laser beam or welding gas supply directly through the rotation axis of a focus adjustment system.
Fluidic Rotary Stages: Routing liquid or gas lines to a central dispenser or probe.
Inspection Systems: Passing camera wiring or illumination fibers through the motor axis of a rotary inspection table.

Technical Specifications

Industrial & Commercial Usage

Technical Parameters (Hollow Shaft NEMA 17)

Parameter	Range / Typical Value	Unit
Frame Size (NEMA)	17 (42mm)	Standard
Step Angle	1.8	Degrees
Hollow Bore Diameter	4 to 8	mm
Holding Torque (Typ.)	0.3 to 0.8	Nm
Thermal Management	Air Cooled/Passive	Type

Additional Information

Supplementary Details & Notes

Integrated Production and Customization Workflow

Production includes a final concentricity check using precision jigs to verify that the bore axis aligns perfectly with the electrical axis of rotation, minimizing dynamic imbalance.

Custom Bore Diameter: Adjusting the internal bore diameter (e.g., 6.35mm to 8mm) to match specific cable or fluid conduit sizes.
Flange Modification: Customizing the mounting flange (NEMA standard or proprietary) to integrate a cable gland or sealing ring around the bore exit.
Integrated Encoder/Potentiometer: Mounting a sensor to the hollow shaft output flange to track the absolute or incremental position of the rotating platform.
Vacuum Compatibility: Customizing the motor (e.g., using low outgassing materials and eliminating standard lubricants) for use in vacuum environments.

Service & Support

Technical Advantages and Core Design Features

Clean Energy/Signal Routing: Allows for a direct, centralized path for resources, eliminating external clutter and reducing the risk of cable snagging.
Simplified Assembly: Reduces the complexity of connecting rotating components, especially for continuous rotation stages.
High Torque and Indexing: Retains the core benefits of the hybrid stepper motor (high holding torque and digital positioning accuracy).
Low Magnetic Interference: Careful winding design prevents the magnetic field from interfering with sensitive signals routed through the bore.
Weight Reduction: The absence of solid shaft material contributes to a slight overall weight reduction.

Frequently Asked Questions

Common Inquiries Regarding Hollow Shaft Steppers

Q: Does the hollow shaft reduce the motor's torque?
A: Yes, slightly. Removing the core material reduces the overall magnetic flux path and the effective area of the rotor. However, the torque reduction is minimal (typically <10%) and is easily compensated for by the convenience of the feed-through design.

Q: How do I ensure cables routed through the bore do not interfere with the motor?
A: It is crucial to use highly flexible, well-insulated cables and ensure they have adequate clearance within the bore and are strain-relieved at both ends. The cables should not rub against the inner surface of the rotating component (the rotor sleeve).

Q: Can the hollow shaft be used for a linear actuator?
A: Yes. The hollow bore can accommodate a stationary lead screw, allowing the motor body to rotate and act as the nut, achieving a compact rotary-to-linear actuator with a feed-through capability.

Resources

Advanced Material Selection Guide

Rotor Sleeve: Precision-machined stainless steel or non-magnetic alloy sleeve used to line the bore, ensuring smooth internal passage and high concentricity.

Bearings: High-precision, sealed ball bearings used at both ends of the bore to ensure minimal run-out and protect the internal mechanisms from dust/fluids.

Shaft Geometry: The end shaft is often tapered or keyed for secure coupling to a rotating platform while maintaining the bore integrity.

About Suzhou Retek Electric Technology Co., Ltd.

Unlike other motor suppliers, Retek engineering system prevents the selling of our motors and components by catalogue as every model is customized for our customers. The customers are assured that every component they receive from Retek is designed with their exact specifications in mind. Our total solutions are a combination of our innovation and a close working partnership with our customers and suppliers.

As China Hollow Shaft Stepper Motor Nema 17 42mm Manufacturers and Wholesale Hollow Shaft Stepper Motor Nema 17 42mm OEM/ODM Suppliers, Retek business consists of three platforms: Motors, Die-Casting and CNC manufacturing and wire harness. Retek products are widely supplied for residential fans, vents, boats, airplanes, medical facilities, laboratory facilities, trucks and other automotive machines.

Welcome to send us an RFQ, it is believed you will get the best cost-effective products and services here!

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Suzhou Retek Electric Technology Co., Ltd.

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