Pololu 1200 NEMA 17 Stepper Motor: Unipolar/Bipolar, 200 Steps/Rev, 42×48mm, 4V, 1.2 A/Phase
Pololu 1200 NEMA 17 Stepper Motor: Unipolar/Bipolar, 200 Steps/Rev, 42×48mm, 4V, 1.2 A/Phase
Pololu 1200 NEMA 17 Stepper Motor: Unipolar/Bipolar, 200 Steps/Rev, 42×48mm, 4V, 1.2 A/Phase
The Pololu 1200 NEMA 17 stepper motor is a precision-engineered stepping motor delivering 200 steps per revolution with dual unipolar and bipolar operating modes, making it ideal for applications requiring high positional accuracy and repeatable motion control. Roboticists, automation engineers, and embedded systems developers rely on this motor for CNC machines, 3D printers, camera pan-tilt systems, and laboratory automation equipment where precise angular displacement is critical. This motor solves the challenge of achieving cost-effective, open-loop position control without feedback sensors, eliminating the need for expensive encoders in applications requiring deterministic motion profiles.
Product Overview
The Pololu 1200 NEMA 17 stepper motor operates on the principle of electromagnetic coil energization in sequential patterns, causing the rotor to advance by fixed angular increments. Each complete revolution requires 200 discrete step commands, providing 1.8-degree resolution per step. The motor features a compact 42x48mm form factor with a 5mm diameter shaft, making it suitable for space-constrained applications while maintaining sufficient torque output. The dual unipolar and bipolar winding configuration allows flexibility in driver circuit selection: unipolar operation simplifies control using basic transistor arrays or dedicated unipolar drivers, while bipolar mode enables higher torque output through full-bridge H-bridge driver circuits.
Operating at 4V nominal voltage with 1.2A per phase current rating, this motor delivers approximately 0.4 Nm holding torque, sufficient for light to medium-load positioning tasks. The motor's construction incorporates permanent magnet rotor technology with precision-wound stator coils, ensuring consistent step accuracy across temperature variations. The 48mm length accommodates integrated mounting flanges and provides adequate space for connector attachment, while the standard NEMA 17 footprint ensures compatibility with universal mounting brackets and driver modules available throughout the maker and industrial automation communities.
Key Specifications
| Specification | Details |
| Product Type | NEMA 17 Stepper Motor, Unipolar/Bipolar Hybrid |
| Brand | Pololu |
| 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 |
| Steps per Revolution | 200 steps (1.8 degrees per step) |
| Voltage Rating | 4V nominal (2.8V to 5.5V operating range) |
| Phase Current | 1.2A per phase maximum |
| Holding Torque | 0.4 Nm at rated current |
| Motor Dimensions | 42mm x 48mm body, 5mm shaft diameter |
| Winding Configuration | Dual unipolar/bipolar compatible windings |
| Shaft Type | 5mm diameter, D-shaped cross-section |
| Weight | Approximately 280 grams |
Key Features
- Dual Unipolar/Bipolar Operation: Switch between unipolar and bipolar modes without hardware changes, enabling use with simple transistor drivers or advanced H-bridge circuits for optimized torque and efficiency
- Precise 200 Steps per Revolution: 1.8-degree angular resolution provides smooth, accurate positioning for applications requiring fine motion control without encoder feedback
- Compact NEMA 17 Form Factor: 42x48mm standardized mounting footprint ensures compatibility with universal stepper motor brackets, 3D printer carriages, and industrial automation platforms
- Low Voltage Operation: 4V nominal rating makes this motor ideal for battery-powered robotics, portable CNC systems, and embedded projects where power efficiency is critical
- Robust Permanent Magnet Design: High-quality rotor construction delivers consistent step accuracy across operating temperature ranges from 0 to 40 degrees Celsius
- 5mm Shaft with D-Profile: Standard coupling interface accepts common motor couplings, lead screws, pulleys, and gearboxes used in motion control assemblies
Applications and Use Cases
- 3D Printer XYZ Axis Drives: Controls extruder head positioning and build platform movement with repeatable 1.8-degree increments, essential for layer-by-layer precision printing on FDM machines
- CNC Router and Laser Engraver Stepper Control: Drives spindle positioning and cutting head movement in small-format CNC applications where open-loop step control eliminates encoder cost without sacrificing accuracy
- Robotic Pan-Tilt Camera Systems: Powers continuous-rotation servo applications in surveillance and tracking systems, providing smooth camera movement through microstepping techniques and Arduino or Raspberry Pi control
- Laboratory Automation Equipment: Operates sample carousel rotation, automated pipette positioning, and microscope stage movement in medical and research facilities requiring deterministic motion profiles
- DIY Robotics Projects: Ideal for hobbyist robot arms, autonomous vehicles, and maker-space projects where cost-effective motion control is prioritized and stepper motor simplicity is advantageous
- Automated Greenhouse Systems: Controls nutrient dosing mechanisms, grow light positioning, and plant rotation systems in vertical farming applications requiring scheduled, repeatable motion
How to Use
To implement the Pololu 1200 NEMA 17 stepper motor in your project, first identify your control requirements: determine whether unipolar or bipolar operation suits your driver circuit. For unipolar mode, connect the common wire to positive supply and sequence the four phase wires through a ULN2003 transistor array or equivalent unipolar driver, energizing one or two phases at a time. For bipolar operation, implement an H-bridge driver circuit (L298N, DRV8825, or A4988) that reverses current direction through both windings, enabling full torque output and microstepping capabilities. Connect your microcontroller (Arduino, PIC, STM32) to the driver module step and direction pins, then program step pulses at your desired frequency: 100 Hz produces smooth 18-degree-per-second rotation, while 500 Hz achieves 90-degree-per-second motion suitable for rapid positioning tasks.
Mount the motor using the standard NEMA 17 mounting pattern with M3 or M4 fasteners into your mechanical assembly, ensuring the shaft couples directly to your load through a flexible coupling to prevent binding. Apply 4V power supply with at least 2A capacity to handle phase current surges during acceleration. Begin with low stepping frequencies (50-100 Hz) during initial testing to verify correct phase sequencing and directional response. Implement acceleration ramps in your firmware to prevent stalling at high speeds: gradually increase step frequency from 100 Hz to your target speed over 50-100 milliseconds to maintain synchronization with load inertia. Monitor motor temperature during continuous operation; if the motor exceeds 60 degrees Celsius, reduce phase current through PWM control or implement duty-cycle management to prevent thermal damage.
Frequently Asked Questions
What is the difference between unipolar and bipolar operation on this motor?
Unipolar operation energizes one phase at a time using a single power supply, requiring simpler driver circuits but delivering approximately 70 percent of available torque. Bipolar operation reverses current direction through both motor windings simultaneously using an H-bridge driver, producing full torque output and enabling microstepping for smoother motion. The Pololu 1200 supports both modes through its dual-winding configuration: for unipolar use the common center tap, for bipolar use the four phase wires directly.
Can I use microstepping with this motor to achieve finer resolution than 1.8 degrees?
Yes, microstepping divides each 1.8-degree step into smaller increments by modulating phase current through PWM signals. A bipolar H-bridge driver with PWM capability enables quarter-stepping (0.45 degrees), eighth-stepping (0.225 degrees), or sixteenth-stepping (0.1125 degrees) resolution. Microstepping reduces vibration and enables smoother motion in 3D printers and CNC applications, though it requires more complex driver firmware and slightly reduces holding torque compared to full-step operation.
What maximum speed can this motor achieve and what factors limit it?
The Pololu 1200 can achieve step rates up to 2000-3000 Hz depending on load inertia and driver acceleration ramp profile. At 2000 Hz stepping frequency, the motor rotates at 10 revolutions per second (600 RPM). Speed limitations arise from motor inductance preventing instantaneous current changes and load inertia resisting acceleration. Heavier loads require longer acceleration ramps and lower maximum speeds to maintain synchronization. Implementing soft-start acceleration profiles in firmware prevents stalling and enables reliable high-speed operation.
What holding torque does this motor provide and is it sufficient for my application?
The Pololu 1200 delivers 0.4 Nm holding torque when both phases carry rated 1.2A current. This torque suits light positioning tasks like 3D printer axes, camera pan-tilt systems, and laboratory equipment. For heavier loads exceeding 0.4 Nm, consider adding mechanical locking (friction brakes), gearbox reduction for torque multiplication, or upgrading to larger NEMA 23 motors. Calculate your load torque requirement by multiplying load mass by lever arm distance, then verify your motor selection provides 1.5-2x safety margin.
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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