Hollow Shaft Stepper Motor

What Is Hollow Shaft Stepper Motor?

A hollow shaft stepper motor is a stepper motor that features a central hole through its shaft, allowing components such as cables, shafts, or other mechanical parts to pass through the motor’s center. This design provides a more compact and versatile solution for certain industrial and robotic applications where space efficiency and ease of integration are essential.
Unlike traditional stepper motors, which have a solid shaft, hollow shaft motors enable additional features such as direct coupling of other parts or integration into complex mechanical systems without the need for additional adapters or connectors. The motor's core feature is the "hollow" shaft, which enables a more streamlined and efficient setup

The motor shaft is a hollow metal tube to reduce the weight of the rotating shaft. Hollow shaft motors have a wide range of uses. They have the advantages of reducing size, weight, noise, being multi-purpose, reducing costs, being simple to manufacture, and easy to use.

BesFoc Hollow Shaft Stepper Motor:

BesFoc supports the customization of hollow shaft motors for various applications. Motor size include Nema 8 11 14 16 17 23 24 34.

NEMA 8 Hollow Shaft Stepper Motor

Stepper motor, small size, high torque, low noise, step angle: 1.8°, NEMA8, 20x20mm

Optional: Connector...

Model

Step Angle

Phase

Shaft

Wires

Body Length

Current

Resistance

Inductance

Holding Torque

Leads No

Rotor Inertia

Weight

(°)

(L)mm

N.cm

No.

g.cm2

BF20HSH30-0604

1.8

hollow shaft

Connector

0.6

6.5

1.7

1.8

0.05

BF20HSH38-0604

1.8

hollow shaft

Connector

0.6

2.2

0.08

NEMA 11 Hollow Shaft Stepper Motor

Stepper motor, small size, high torque, low noise, step angle: 1.8°, NEMA11, 28x28mm

Optional: Connector...

Model	Step Angle	Phase	Shaft	Wires	Body Length	Current	Resistance	Inductance	Holding Torque	Leads No.	Rotor Inertia	Weight
Model	(°)	/	/	/	(L) mm	A	Ω	h	N.cm	No.	g.cm2	Kg
BF28HSH32-0674	1.8	2	hollow shaft	Lead wire	32	0.67	5.6	3.4	6	4	9	0.11
BF28HSH45-0674	1.8	2	hollow shaft	Lead wire	45	0.67	6.8	4.9	9.5	4	12	0.14
BF28HSH51-0674	1.8	2	hollow shaft	Lead wire	51	0.67	9.2	7.2	12	4	18	0.2

NEMA 14 Hollow Shaft Stepper Motor

Stepper motor, small size, high torque, low noise, step angle: 1.8°, NEMA14, 35x35mm

Optional: Connector...

Model	Step Angle	Phase	Shaft	Wires	Body Length	Current	Resistance	Inductance	Holding Torque	Leads No.	Rotor Inertia	Weight
Model	(°)	/	/	/	(L)mm	A	Ω	h	N.cm	No.	g.cm2	Kg
BF35HSH28-0504	1.8	2	hollow shaft	Lead wire	28	0.5	20	14	10	4	11	0.13
BF35HSH34-1004	1.8	2	hollow shaft	Lead wire	34	1	2.7	4.3	14	4	13	0.17
BF35HSH42-1004	1.8	2	hollow shaft	Lead wire	42	1	3.8	3.5	20	4	23	0.22

NEMA 17 Hollow Shaft Stepper Motor

Stepper motor, high torque, low noise, smooth type, step angle: 1.8°, NEMA17, 42x42mm

Optional: Connector...

Model	Step Angle	Phase	Shaft	Wires	Body Length	Current	Resistance	Inductance	Holding Torque	Leads No.	Rotor Inertia	Weight
Model	(°)	/	/	/	(L)mm	A	Ω	h	N.cm	No.	g.cm2	Kg
BF42HSH34-1334	1.8	2	hollow shaft	Lead wire	34	1.33	2.1	2.5	26	4	34	0.22
BF42HSH40-1704	1.8	2	hollow shaft	Lead wire	40	1.7	1.5	2.3	42	4	54	0.28
BF42HSH48-1684	1.8	2	hollow shaft	Lead wire	48	1.68	1.65	2.8	44	4	68	0.35
BF42HSH60-1704	1.8	2	hollow shaft	Connector	60	1.7	3	6.2	7.3	4	102	0.55

NEMA 23 Hollow Shaft Stepper Motor

Stepper motor, high torque, low noise, smooth type, step angle: 1.8° NEMA23, 57x57mm

Optional: Connector...

Model	Step Angle	Phase	Shaft	Wires	Body Length	Current	Resistance	Inductance	Holding Torque	Leads No.	Rotor Inertia	Weight
Model	(°)	/	/	/	(L)mm	A	Ω	hh	Nm	No.	g.cm2	Kg
BF57HSH41-2804	1.8	2	hollow shaft	Lead wire	41	2.8	0.7	1.4	0.55	4	150	0.47
BF57HSH51-2804	1.8	2	hollow shaft	Lead wire	51	2.8	0.83	2.2	1.01	4	230	0.59
BF57HSH56-2804	1.8	2	hollow shaft	Lead wire	56	2.8	0.9	2.5	1.26	4	280	0.68
BF57HSH76-2804	1.8	2	hollow shaft	Lead wire	76	2.8	1.1	3.6	1.89	4	440	1.1
BF57HSH82-3004	1.8	2	hollow shaft	Lead wire	82	3.0	1.2	4.0	2.1	4	600	1.2
BF57HSH100-3004	1.8	2	hollow shaft	Lead wire	100	3.0	0.75	3.0	3.0	4	700	1.3
BF57HSH112-3004	1.8	2	hollow shaft	Lead wire	112	3.0	1.6	7.5	3.0	4	800	1.4

NEMA 34 Hollow Shaft Stepper Motor

Stepper motor, low rotor inertia, large torque, fast acceleration, step angle: 1.8°, NEMA34, 86x86mm

Optional: Connector...

Model	Step Angle	Phase	Shaft	Wires	Body Length	Current	Resistance	Inductance	Holding Torque	Leads No.	Rotor Inertia	Weight
Model	(°)	/	/	/	(L)mm	A	Ω	hh	Nm	No.	g.cm2	Kg
BF86HSH78-6004	1.8	2	hollow shaft	Lead wire	78	6.0	0.37	3.4	4.6	4	1400	2.3
BF86HSH115-6004	1.8	2	hollow shaft	Lead wire	115	6.0	0.6	6.5	8.7	4	2700	3.8
FB86HSH126-6004	1.8	2	hollow shaft	Lead wire	126	6.0	0.58	6.5	9.5	4	3200	4.5
BF86HSH155-6004	1.8	2	hollow shaft	Lead wire	155	6.0	0.68	9.0	13.0	4	4000	5.4

Hollow Shaft Stepper Motor Features:

1. Central Hollow Shaft:

The defining feature of this motor is the hollow center of the shaft, which allows for easier routing of cables or other mechanical components, reducing clutter and saving space.

2. Compact Design:

Despite the hollow shaft, these motors maintain a compact design, providing high torque and performance while occupying less space in the system.

3. Direct Coupling:

The hollow shaft design allows for direct coupling with other mechanical parts such as gearboxes or actuators, simplifying integration and improving efficiency.

4. Flexibility in Installation:

Hollow shaft stepper motors are particularly useful in applications where other components, such as wiring or optical systems, need to pass through the center of the motor, ensuring a cleaner, more organized design.

5. Smooth Operation:

These motors provide smooth and precise step-by-step motion control, making them ideal for applications requiring high accuracy and reliability.

How Does a Hollow Shaft Stepper Motor Work?

A hollow shaft stepper motor works on the same principles as a regular stepper motor, but with the added benefit of its unique shaft design. Like traditional stepper motors, it moves in discrete steps, each corresponding to a fixed angle of rotation. The difference lies in the construction of the motor's shaft.

1. Input Signal:

The stepper motor receives signals from the controller that dictate the desired movement (position or speed).

2. Magnetic Field Interaction:

Inside the motor, a series of permanent magnets and windings interact to produce torque, causing the rotor to rotate in precise steps.

3. Hollow Shaft Design:

The rotor shaft is hollow, allowing additional components to pass through the center, such as cables or even other mechanical systems. This design makes it easier to integrate the motor into space-constrained systems or machines without additional parts or adapters.

4. Motion Control:

The motor continues to rotate step-by-step, with each step corresponding to a specific mechanical increment, allowing for precise control of position and speed. The hollow shaft ensures that components do not interfere with the motor's rotation.

Benefits of Hollow Shaft Stepper Motors

1. Space Efficiency

The most obvious benefit of hollow shaft stepper motors is the space savings they offer. The central hole in the shaft enables other components to pass through the motor, reducing the need for additional space in tight setups. This makes it easier to create compact systems without compromising on performance.

2. Simplified Integration

Due to their unique design, hollow shaft stepper motors are easier to integrate into complex mechanical systems. Components such as shafts, cables, or other parts can pass through the motor without the need for extra adapters or couplings, simplifying the design and assembly process.

3. Higher Torque Density

Despite their compact size, hollow shaft stepper motors can deliver high torque levels, similar to traditional solid shaft motors. This makes them ideal for applications that require both space efficiency and high-performance output.

4. Reduced Mechanical Complexity

Hollow shaft motors reduce the complexity of mechanical designs by eliminating the need for external couplings or connectors. This leads to fewer parts, reducing the potential for mechanical failure and improving overall system reliability.

5. Clean and Organized Systems

The ability to route cables and other components through the hollow shaft keeps the system organized and free of clutter. This is especially beneficial in automated systems, where neatness and simplicity are key to improving functionality and reducing maintenance time.

Applications of Hollow Shaft Stepper Motors

Hollow shaft stepper motors are highly versatile and are used in various industries, especially where space efficiency, ease of integration, and high-performance are critical. Below are some of the most common applications:

1. Robotics

In robotics, hollow shaft stepper motors are used to power robotic arms, grippers, and other moving parts. The hollow shaft design allows for the integration of sensors, cables, or control systems through the center, reducing complexity and making the system more compact and efficient.

2. CNC Machines

In CNC (Computer Numerical Control) machinery, hollow shaft stepper motors are used to drive the tools and axes. The ability to pass cables or shafts through the motor allows for cleaner setups and reduces the need for additional adapters, leading to more streamlined and precise operations.

3. 3D Printers

Hollow shaft stepper motors are commonly used in 3D printers to control the movement of the print head or build platform. The motor’s compact design and the ability to route wiring through the shaft help maintain a clean and organized system, crucial for the smooth operation of 3D printing processes.

4. Automated Conveyor Systems

In automated conveyor systems, hollow shaft stepper motors are used to drive belts and other components. The motor’s hollow shaft enables the routing of power or control cables through the center, which can be essential in large-scale, automated production lines.

5. Medical Equipment

Hollow shaft stepper motors are often used in medical devices like MRI machines, diagnostic equipment, or surgical robots, where precision and compact design are essential. The ability to pass cables or even sensors through the motor’s shaft enables cleaner, more efficient setups in sensitive medical environments.

6. Optical Systems

In optical systems, hollow shaft stepper motors are used to drive lenses, mirrors, and other optical components. The hollow shaft allows for the routing of optical fibers or cables through the center of the motor, simplifying the design and ensuring that the system remains clean and efficient.

Hollow shaft stepper motors excel in applications demanding compactness, high torque, and seamless integration. Their unique design—allowing components to pass through the central shaft—streamlines systems, enhances performance, and simplifies complexity. From robotics and CNC machinery to 3D printing and medical equipment, these motors serve as versatile and efficient solutions across diverse applications. Understanding their capabilities enables businesses to harness this technology to optimize their systems and meet modern automation requirements.