NEMA16 39HY38-0504 2.9Kg-cm Stepper Motor Round-Type Shaft
NEMA16 39HY38-0504 2.9Kg-cm Stepper Motor Round-Type Shaft
NEMA16 39HY38-0504 2.9Kg-cm Stepper Motor Round-Type Shaft
The NEMA16 39HY38-0504 is a compact bipolar stepper motor with a round-type shaft configuration, delivering 2.9 kg-cm holding torque for precise positional control in automation and robotics applications. Professional engineers and hobbyists use this motor for CNC machines, 3D printers, automated dispensing systems, and laboratory instrumentation where accurate step-by-step motion is critical. This motor solves the challenge of achieving repeatable angular positioning without feedback sensors, making it ideal for open-loop control systems requiring reliability and cost-effectiveness.
Product Overview
The NEMA16 39HY38-0504 stepper motor operates on the principle of electromagnetic coil excitation to produce discrete angular steps, typically 1.8 degrees per step in full-step mode. The motor features a two-phase bipolar winding configuration that allows for microstepping capability when driven by appropriate driver circuits, enabling smooth motion and reduced vibration. The round-type shaft design provides a standard interface for direct coupling to pulleys, gears, or lead screws without requiring shaft adapters, reducing mechanical complexity in compact assemblies.
This NEMA16 frame size motor combines the advantage of moderate torque output with a compact footprint, making it suitable for space-constrained applications. The 2.9 kg-cm holding torque specification ensures sufficient force to maintain position against moderate external loads without continuous power consumption during static holding. The motor's construction with quality laminated stator cores and precision-wound coils ensures consistent performance across thousands of operating hours, with minimal cogging torque and smooth acceleration characteristics ideal for applications requiring silent operation.
Key Specifications
| Specification | Details |
| Product Type | Bipolar Stepper Motor NEMA16 |
| Model Number | 39HY38-0504 |
| Frame Size | NEMA16 (40mm x 40mm mounting) |
| Shaft Type | Round-Type Shaft |
| Holding Torque | 2.9 kg-cm (0.285 N-m) |
| Step Angle | 1.8 degrees per step (200 steps per revolution) |
| Phases | 2-Phase Bipolar |
| Winding Resistance | Approximately 15-20 ohms per phase |
| Operating Voltage | 12V to 24V DC recommended |
| Maximum Current | 0.5A to 1.0A per phase (driver dependent) |
| Origin | Original/Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
Key Features
- 2.9 kg-cm holding torque provides reliable positional accuracy for light to medium load applications without requiring continuous power
- Round-type shaft design eliminates the need for shaft couplers or adapters, reducing assembly time and mechanical complexity
- 1.8-degree step angle with 200 steps per revolution enables precise positioning suitable for CNC and automation control systems
- Two-phase bipolar configuration supports both full-step and microstepping modes for smooth motion and reduced vibration
- Compact NEMA16 frame size fits seamlessly into space-constrained enclosures and robotic platforms
- Low cogging torque ensures smooth acceleration and deceleration without mechanical jerking
Applications and Use Cases
- 3D Printer XY-Axis Movement: Drives the X and Y carriage positioning with 2.9 kg-cm torque sufficient for print head and heated bed motion at 12-24V operation
- CNC Engraving Machines: Controls rotary table positioning and spindle speed regulation in small-format CNC mills and laser engravers
- Automated Liquid Dispensing Systems: Powers syringe pump mechanisms and valve actuation in laboratory automation and medical device applications
- Robotic Arm Joints: Provides precise joint articulation for 4-axis or 6-axis robotic arms in pick-and-place and assembly automation tasks
- Document Scanning Equipment: Controls document feed mechanisms and lens positioning in automated scanning and imaging systems
- Telescope and Microscope Mounts: Enables precise azimuth and elevation adjustment in astronomical observation and precision optical alignment
How to Use
To integrate the NEMA16 39HY38-0504 stepper motor into your system, first identify the four motor leads and determine their phase assignments using a multimeter to measure winding resistance. Connect the motor to a compatible stepper driver module such as A4988, DRV8825, or TMC2209, ensuring proper phase wiring to avoid stuttering or loss of torque. Supply 12V to 24V DC power to the driver module while keeping the logic control signals at 3.3V or 5V levels depending on your microcontroller platform. Configure your microcontroller firmware to generate step and direction pulses at appropriate frequencies, typically 1 kHz to 10 kHz for smooth operation without exceeding the motor's maximum step rate of approximately 3000 steps per second.
Mount the motor securely using the NEMA16 four-hole mounting pattern with M3 or M4 bolts, ensuring the round shaft is properly aligned with your driven mechanism. Apply a small amount of mechanical load gradually while testing to confirm the motor maintains position without slipping. For optimal performance, use microstepping at 16x or higher resolution to reduce vibration and improve positional accuracy, though this requires a microstepping-capable driver. Monitor motor temperature during extended operation; if the motor becomes too hot to touch, reduce current or add a cooling fan, as excessive heat degrades winding insulation over time.
Frequently Asked Questions
What is the difference between holding torque and running torque in this stepper motor?
Holding torque (2.9 kg-cm) is the maximum static load the motor can maintain without slipping when powered but not stepping. Running torque is lower and decreases further at higher stepping speeds due to back-EMF effects. At 1 kHz stepping frequency, expect approximately 60-70% of holding torque; at 3 kHz, expect 30-40%. For dynamic applications, always design your mechanical load to be well below the holding torque specification to ensure reliable operation across the intended speed range.
Can I use a 5V power supply with the NEMA16 39HY38-0504?
While the motor's winding resistance is approximately 15-20 ohms per phase, using 5V is not recommended because the stepper driver requires higher voltage to overcome back-EMF at practical stepping speeds. At 5V, you will experience poor torque characteristics and limited stepping frequency capability. The recommended operating voltage is 12V to 24V DC, which provides adequate voltage headroom for the driver to regulate current effectively and deliver full torque across a wide speed range. Using 12V is suitable for most hobby applications, while 24V is preferred for industrial systems requiring higher speed capability.
How do I determine which leads are paired phases in this motor?
The NEMA16 39HY38-0504 has four leads representing two phases. Use a multimeter set to resistance mode to identify phase pairs: measure resistance between each pair of leads. The two pairs showing approximately 15-20 ohms are the phase windings; the other combinations will show open circuit or very high resistance. Label one phase as A and A-bar, and the other as B and B-bar. In your wiring diagram, connect A and A-bar to one coil output of your stepper driver, and B and B-bar to the other coil output. Incorrect phase pairing will cause the motor to vibrate or not rotate.
What microstepping mode should I use for best performance?
For most applications, 16x microstepping provides an excellent balance between smooth motion and processing overhead. At 16x microstepping, the effective step angle becomes 0.1125 degrees, significantly reducing vibration and cogging effects compared to full-step operation. If your application requires very smooth motion at low speeds (such as 3D printing), use 16x or 32x microstepping. If you need maximum torque at high speeds, use 8x microstepping as a compromise. Full-step mode should be avoided in modern systems due to excessive vibration, though it offers slightly higher torque at very high speeds where microstepping loses effectiveness.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
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- Expert Team: Our technical team validates every product before listing
- Fast Shipping: Dispatched within 1-5 days from our Bengaluru warehouse
- Pan-India Delivery: 7-8 days to Mumbai, Delhi, Chennai, Hyderabad, Pune, Kolkata
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- Technical Support: 24/7 expert guidance via email and WhatsApp
- Returns: 7-day return policy on manufacturing defects only
Buy NEMA16 39HY38-0504 2.9Kg-cm Stepper Motor Round-Type Shaft Online in India
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