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: 75N(20mm from the flange)
- Max. axial force: 15N
- Rotation: CCW
- Insulation Class: B(130℃)
Defination of Part number
57 | HY | 40 | M | S | 309 | X |
Frame size | Round 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） |
|---|---|---|---|---|---|---|---|---|---|
| 57HY40MS309 | 40 | 0.9° | 3.9 | 1 | 3.9 | 25 | 6 | 50 | 0.34 |
| 57HY49MS703 | 49 | 0.9° | 7.3 | 0.85 | 6.205 | 50 | 6 | 120 | 0.51 |
| 57HY51MF155 | 51 | 0.9° | 15.5 | 0.5 | 7.75 | 52 | 4 | 125 | 0.55 |
In-Depth Applications for the Round NEMA 23 Hybrid Stepper Motor 0.9°
The 57HYM Series, with its native 0.9° step angle, provides double the angular resolution of standard 1.8° NEMA 23 motors, resulting in significantly smoother acceleration and deceleration. This makes it crucial for noise-sensitive and high-accuracy systems. Key application areas include:
- Optical & Scanning Systems: Essential for high-resolution 3D scanning, laser alignment, and stage control where micro-radian precision is necessary.
- Precision Dispensing & Metering: Used in syringe pumps and fluid handling systems to ensure pulsation-free, highly accurate volumetric dosing.
- Dynamic Positioning: The round motor body minimizes overall mass and rotor inertia compared to a full square frame, enabling faster acceleration and deceleration times for dynamic positioning tasks.
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 main performance difference between the 0.9° and 1.8° NEMA 23 models?
A: The 0.9° (57HYM) model offers 400 full steps per revolution, which provides double the inherent resolution. This results in significantly smoother low-speed movement and quieter operation compared to the 1.8° model, which is beneficial for optical or scanning systems.
Q: What is the main difference between the 57HYM (Round Body) and 57HS (Square Body) Series?
A: Both are NEMA 23 hybrid stepper motors and use the standard square 57×57 mm mounting flange. The key difference is mass and inertia: the 57HYM (Round Body) typically has lower rotor inertia than the 57HS (Square Body) of a comparable length. This makes the 57HYM motor preferable for dynamic applications requiring quicker start/stop cycles.
Q: Does this 57mm round hybrid stepper motor 0.9° require a special driver?
A: Yes. As a hybrid stepper motor, it requires a constant current stepper motor driver. To fully utilize the 0.9° resolution, the driver must support micro-stepping technology.
Q: Can I attach a planetary gearbox to this NEMA 23 hybrid stepper motor 0.9°?
A: Yes. Most models in the 57HYM series can be supplied with various gearbox options, including planetary, worm wheel, and parallel shaft gearboxes, as part of our customization service.