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
20 | HS | 26 | D | F | 2 | 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） |
|---|---|---|---|---|---|---|---|---|---|
| 20HS26DF20 | 26 | 1.8° | 20 | 0.2 | 4 | 1.6 | 4 | 2 | 0.1 |
| 20HS26DF2 | 26 | 1.8° | 2 | 0.6 | 4 | 1.6 | 4 | 2 | 0.1 |
| 20HS30DF605 | 30 | 1.8° | 6.5 | 0.6 | 3.9 | 1.8 | 4 | 2.5 | 0.1 |
| 20HS33DF605 | 33 | 1.8° | 6.5 | 0.6 | 3.9 | 1.8 | 4 | 2.5 | 0.11 |
| 20HS42DF505 | 42 | 1.8° | 5.4 | 0.8 | 4.32 | 3 | 4 | 3 | 0.12 |
In-Depth Applications for the NEMA 8 Hybrid Stepper Motor
The 20HS Series NEMA 8 frame size and fine step resolution make it an indispensable component in miniature motion control systems. Key application areas include:
- Medical & Laboratory: Ideal for automatic dispensing pumps, micro-samplers, and valve actuation in portable or lab-based analytical instruments.
- Optics & Security: Provides precise micro-movements for lens focusing, aperture control in cameras, and high-precision positioning in security camera systems.
- 3D Printing & Electronics: Used in the Z-axis lift and extruder mechanisms of miniature 3D printers, and in pick-and-place machines for fine component handling.
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 8 hybrid stepper motor?
A: The main benefit is the precise open-loop positioning. This NEMA 8 hybrid stepper motor uses pulse signals to accurately hold and move to the designated position without 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 20mm 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 20HSD Series?
A: This 20mm 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.