General Specification
- Step Angle Accuracy: ±5%（full step， no load）
- Resistance Accuracy: ±10%
- Inductance Accuracy: ±20%
- Temperature Rise: 80℃ max （rated current, 2 phase on）
- Ambient Temperature: -20℃~+50℃
- Insulation Resistance: 100MΩ min，500VDC
- Dielectric Strength: 500VDC for one minute
- Shaft Radial Play: 0.02mm max（450g load）
- Shaft Axial Play: 0.08mm max（450g load）
- Max. radial force: 28N(20mm from the flange)
- Max. axial force: 10N
- Rotation: CCW
- Insulation Class: B(130℃)
Defination of Part number
28 | HS | 20 | D | F | 10 | X |
Frame size | Square hybrid stepper motor* | Length | Step angle** | Lead wire*** | Winding Type | External code |
*: This code shows the sharp of the motor. HS = Square hybrid stepper motor; HY = Round hybrid stepper motor.
**: This code shows the stepper angle of the motor. M = 0.9°; D =1.8°.
***: This code shows the lead wire number of the motor, the detail code defination is: F = 4; V = 5; S = 6; E = 8.
Specifications
| Model | Length (mm) | Step angle deg | Resistance (Ω) | Current (A) | Voltage | Holding torque (N.cm) | Lead wires/pins | Rotor inetia （g.cm²） | Weight （kg） |
|---|---|---|---|---|---|---|---|---|---|
| 28HS20DF10 | 20 | 1.8° | 10 | 0.5 | 5 | 3.4 | 4 | 7 | 0.1 |
| 28HS24DF12 | 24 | 1.8° | 12 | 0.5 | 6 | 3 | 4 | 8 | 0.1 |
| 28HS31DF54 | 31 | 1.8° | 48 | 0.3 | 14.4 | 7 | 4 | 10 | 0.11 |
| 28HS33DF01 | 33 | 1.8° | 5.8 | 0.67 | 3.9 | 6 | 4 | 10 | 0.12 |
| 28HS33DS36 | 33 | 1.8° | 36 | 0.3 | 10.8 | 5 | 6 | 10 | 0.12 |
| 28HS33DF50 | 33 | 1.8° | 50 | 0.24 | 12 | 5.5 | 4 | 10 | 0.12 |
| 28HS40DS304 | 40 | 1.8° | 3.4 | 0.95 | 3.23 | 7.5 | 4 | 12 | 0.14 |
| 28HS50DF305 | 50 | 1.8° | 3.5 | 1 | 3.5 | 13 | 4 | 18 | 0.2 |
| 28HS50DF10 | 50 | 1.8° | 10 | 0.5 | 5 | 9 | 4 | 18 | 0.2 |
| 28HS50DS204 | 50 | 1.8° | 2.4 | 0.95 | 2.28 | 8 | 6 | 18 | 0.2 |
In-Depth Applications for the NEMA 11 Hybrid Stepper Motor
The 28HS Series NEMA 11 frame size and robust torque output make it an indispensable component in small-scale automation and instrumentation. Key application areas include:
- Medical & Laboratory: Ideal for precise control of drug dosage, fluid dispensing pumps, and internal actuators in laboratory analyzers.
- Office & Printing Equipment: Drives paper-feed mechanisms, cartridge positioning systems, and small robotic arms in copiers, printers, and scanners.
- Telecommunications & Security: Provides precise positioning for PTZ (Pan/Tilt/Zoom) cameras, as well as micro-actuators for antenna or sensor positioning.
Outline
Customization
 |  |  |  | |  |
| Shaft | Encoder | Brake | Connector | Pulley | Gearbox |
| Item | Description |
|---|---|
| Shaft Extensions | Motors can be configured with single or double-ended shafts, manufactured to your specific length. |
| Encoder Options | We offer integration with various encoders to meet specific resolution and application needs. |
| Brake Options | Motors can be equipped with an optional brake, available with or without a manual hand release. |
| Cable Harnesses | Custom cable harnesses, with or without connectors, are available upon request. |
| Pulleys & Pinion Gears | Pulleys or pinion gears can be supplied and mounted to your specifications. |
| Gearbox Integration | Most motors can be paired with various gearbox types, including planetary, worm wheel, and parallel shaft gearboxes. |
Frequently Asked Questions (FAQ)
Q: What is the primary benefit of choosing this NEMA 11 hybrid stepper motor?
A: The main benefit is the precise open-loop positioning. This NEMA 11 hybrid stepper motor uses pulse signals to accurately hold and move to the designated position without needing an encoder, making it a simple yet accurate solution for micro-actuation.
Q: Why is this motor classified as “Hybrid” Stepper Motor?
A: The term “Hybrid” indicates the motor combines the best features of a Variable Reluctance stepper motor (smooth rotation) and a Permanent Magnet stepper motor (high torque). This design allows for higher resolution, higher torque, and better dynamic performance compared to simpler permanent magnet steppers.
Q: Does this 28mm hybrid stepper motor require a special driver?
A: Yes. As a hybrid stepper motor, it requires a constant current stepper motor driver. This driver manages the current phases to ensure smooth, precise stepping. AKT Motor can provide compatible drivers tailored to the motor’s current rating.
Q: What is the step angle accuracy of the 28HSD Series?
A: This 28mm hybrid stepper motor offers an accurate 1.8° step angle (200 steps per revolution). With micro-stepping technology, you can achieve even finer positioning resolution.