Seven motor options
Seven motor lengths from 41 to 100 mm provide 0.6 to 3 N·m holding torque for flexible axis sizing.
SP57 57 mm Hybrid Rotary Stepper Motor
Hybrid Rotary Stepper Motor
Compact 57 mm hybrid rotary stepper motor series with 0.6–3 N·m holding torque, 1–5 A rated current and 41–100 mm motor lengths. EK2/EK3 encoder, power-off brake and planetary gearbox options are available.
Positioning accuracy
High torsional rigidity and constant torsional backlash over the entire gearbox service life ensure consistently high performance
Compactness
High torque density thanks to high performance and short design
Low maintenance
Highest quality standards for a long service life and extended maintenance intervals
Technical data
Compact precision rotary motion
57 mm hybrid stepper performance for precise machine axes
The SP57 57 mm hybrid rotary stepper motor series combines 0.6–3 N·m holding torque, seven body lengths and continuous-duty construction for accurate indexing, positioning and automation equipment.
Durable construction
Deep-groove ball bearings, a stainless-steel shaft and S1 duty rating support stable continuous operation.
Flexible configuration
Optional EK2 or EK3 encoder, power-off brake and 57 mm planetary gearbox support feedback, holding and geared-axis requirements.
Engineering information
Technical data
Model-level electrical, mechanical and option data for direct comparison and system sizing.
57 mmFrame size
0.6–3 N·mHolding torque
1–5 ARated current
41–100 mmMotor length
Model selection
SP57 series specifications
Select the motor length and winding that match the required holding torque and rated current.
| Model | Rated current | Resistance | Inductance | Holding torque | Rotor inertia | Motor length | Weight |
|---|---|---|---|---|---|---|---|
| 23H2042 | 1 A | 4.2 Ω | 9 mH | 0.6 N·m | 140 g·cm² | 41 mm | 460 g |
| 23H2045 | 1 A | 4.5 Ω | 12 mH | 0.8 N·m | 180 g·cm² | 44 mm | 520 g |
| 23H2051 | 2 A | 1.5 Ω | 4.4 mH | 1 N·m | 240 g·cm² | 51 mm | 640 g |
| 23H2055 | 2 A | 1.6 Ω | 5.2 mH | 1.2 N·m | 280 g·cm² | 54 mm | 720 g |
| 23H2065 | 3 A | 0.9 Ω | 2.7 mH | 1.6 N·m | 350 g·cm² | 64 mm | 860 g |
| 23H2076 | 4 A | 0.6 Ω | 2.4 mH | 2 N·m | 480 g·cm² | 75 mm | 1060 g |
| 23H2100 | 5 A | 0.46 Ω | 2.3 mH | 3 N·m | 720 g·cm² | 100 mm | 1500 g |
Electrical
Standard characteristics
| Parameter | Value |
|---|---|
| Step angle | 1.8° ±5% |
| Resistance tolerance | ±10% at 20°C |
| Inductance tolerance | ±20% at 1 kHz |
| Insulation class | Class B |
| Duty cycle | S1 |
| Dielectric strength | 500 VAC / 1 kHz / 1 mA / 1 s |
| Insulation resistance | 100 MΩ at 500 VDC |
Mechanical
Loads and materials
| Parameter | Value |
|---|---|
| Permissible radial load | 180 / 130 / 100 / 90 N at 5 / 10 / 15 / 20 mm |
| Front cover | Die-cast aluminum alloy |
| Bearing | Deep-groove ball bearing |
| Permanent magnet | Sintered NdFeB |
| Shaft | Stainless steel |
| Lead wire | UL 3265, 22/20 AWG |
Feedback options
Encoder selection
| Encoder | Output | Resolution |
|---|---|---|
| EK2 | Single-ended | 50–1250 |
| EK2 | Differential | 50–5000 |
| EK3 | Single-ended | 64–3600 |
| EK3 | Differential | 100–10000 |
Holding option
Power-off brake
| Parameter | Value |
|---|---|
| Voltage | 24 VDC ±5% |
| Resistance | 141 Ω ±10% |
| Power | 5 W |
| Static torque | >2 N·m |
| Insulation class | Class B |
| Insulation resistance | >100 MΩ at 500 VDC |
| Dielectric strength | AC 1000 V / 1 s |
| Engage / release time | 50 ms / 50 ms |
| Rotational clearance | 1° |
| Emergency braking | 200 cycles |
| Mechanical life | 2,000,000 cycles |
| Noise | <60 dB |
Torque multiplication
57 mm planetary gearbox
Metal-housing gearbox configurations with ball-bearing support.
| Ratio | Rated torque | Peak torque | Stages | Efficiency | Length | Weight | No-load backlash |
|---|---|---|---|---|---|---|---|
| 5 / 10 | 6 N·m | 12 N·m | 1 | 95% | 53 mm | 900 g | 15 arcmin |
| 15 / 20 / 25 | 25 N·m | 40 N·m | 2 | 90% | 70 mm | 1200 g | 25 arcmin |
Configurable machine integration
One motor platform for direct drive, feedback and geared axes
The SP57 57 mm hybrid rotary stepper motor can be configured with an EK2 or EK3 encoder, a power-off brake or a planetary gearbox to match feedback, holding and output-torque requirements.
- Seven body lengths cover 0.6–3 N·m holding torque
- EK2 and EK3 encoder options for feedback-based motion control
- Optional brake and gearbox for holding or geared axes
Application fields
Built for precise rotary motion in industrial equipment
The SP57 series suits equipment that needs compact installation, repeatable positioning and configurable feedback or gearing.
Industrial automation
Conveyors, rotary tables, transfer systems and packaging equipment.
Inspection equipment
Repeatable positioning for test stands, vision systems and metrology platforms.
Robotics
Positioning axes, fixtures and compact rotary mechanisms.
CNC and machine tools
Feed mechanisms, indexing fixtures and auxiliary machine axes.
System integration
Configure the motor around your machine requirements
Share load, speed, current, duty cycle, shaft geometry and option requirements for model selection.
Frame size57 mm
Model lengths41 / 44 / 51 / 54 / 64 / 75 / 100 mm
Holding torque0.6 / 0.8 / 1 / 1.2 / 1.6 / 2 / 3 N·m
Rated current1 / 1 / 2 / 2 / 3 / 4 / 5 A
Available optionsEK2/EK3 encoder / brake / planetary gearbox
Discuss your 57 mm rotary stepper motor requirement with our engineers.
Share the target torque, speed, current, shaft geometry and option requirements for model selection and customization support.
Contact us
Would you like to learn more about our solutions?
We would be happy to advise you—personally, competently, and tailored to your requirements.
Perfection in a new dimension
Further Information
Short delivery times available for selected product configurations.
The TP+ HIGH TORQUE enables maximum torque density and maximum torsional rigidity—ideal for demanding applications with dynamic load changes and high positioning accuracy.
alpha Advanced Line gearboxes with increased durability and food-grade lubrication available.
The TP+ for coordinated pinion-rack systems for medium to high requirements. Typical areas of application in wood, plastic, and composite processing, in machining centers, or in automation.
With cynapse® and smart services, you can unleash the full potential of your drive system: sensor data is processed, visualized, and analyzed intelligently. Find out how the combination of gearboxes with cynapse® and our Smart Services can make your digital production faster, safer, and more efficient.
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