Pololu 4790 / 4791 Micro Metal Gearmotor LP 6V - 380:1 gear ratio
Pololu 4790 / 4791 Micro Metal Gearmotor LP 6V - 380:1 gear ratio
Pololu 4790 / 4791 Micro Metal Gearmotor LP 6V - 380:1 gear ratio
The Pololu 4790 / 4791 Micro Metal Gearmotor LP 6V is a compact, high-torque DC motor with a 380:1 gear reduction ratio designed for precision robotics and embedded systems requiring low-speed, high-torque output. Professional engineers and hobbyists use this motor in autonomous vehicles, robotic arms, line-following robots, and precision positioning systems where space constraints demand miniaturized solutions. This gearmotor solves the critical engineering challenge of delivering substantial mechanical torque from a minimal footprint while maintaining predictable speed control through PWM regulation.
Product Overview
The Pololu Micro Metal Gearmotor LP series combines a brushed DC motor with a precision planetary gearbox to achieve exceptional torque multiplication from a compact 10mm diameter cylindrical form factor. The 380:1 gear ratio reduction transforms the motor's inherent high-speed output into controlled low-speed rotation, making it ideal for applications requiring fine positional control. The LP designation indicates this is the low-power variant optimized for 6V operation, delivering approximately 0.8 kg-cm continuous torque at rated voltage with minimal current draw, making it suitable for battery-powered applications where power efficiency is paramount.
The gearbox employs a multi-stage planetary gear arrangement that distributes load across multiple teeth simultaneously, resulting in exceptional mechanical efficiency typically exceeding 85 percent. This design eliminates backlash issues common in simpler spur gear arrangements, critical for applications requiring accurate positioning feedback. The motor shaft features a 3mm diameter output with a D-shaped flat, compatible with standard Pololu wheels, encoders, and mechanical couplings. Built-in protection against reverse polarity through integrated diode protection prevents accidental damage from incorrect wiring, a practical feature for rapid prototyping environments.
Key Specifications
| Specification | Details |
| Product Type | Micro Metal Gearmotor with Planetary Gearbox |
| Brand | Pololu |
| Model Number | 4790 / 4791 |
| 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 |
| Rated Voltage | 6V DC |
| Gear Ratio | 380:1 |
| Continuous Torque | 0.8 kg-cm at 6V |
| Output Speed | Approximately 50 RPM at 6V no-load |
| Motor Diameter | 10mm cylindrical form factor |
| Output Shaft | 3mm diameter with D-shaped flat |
| Efficiency | Greater than 85 percent |
Key Features
- Compact 10mm diameter design enabling integration into space-constrained robotic platforms and miniaturized mechanical systems
- High-efficiency planetary gearbox with 380:1 reduction delivering substantial torque multiplication while maintaining minimal backlash for precise positioning applications
- Brushed DC motor construction compatible with standard PWM speed control and H-bridge motor drivers for intuitive integration into microcontroller projects
- Integrated reverse-polarity protection diode safeguarding against accidental wiring errors during rapid prototyping and field deployment
- 3mm output shaft with D-shaped profile providing secure mechanical coupling to Pololu wheels, encoders, and standard mechanical components
- Low current draw at rated voltage making it ideal for battery-powered autonomous systems requiring extended operational runtime
Applications and Use Cases
- Line-following and maze-solving robots requiring precise wheel speed control and accurate positional feedback through integrated encoder compatibility
- Robotic arm joint actuators in educational and research platforms where compact form factor and high torque density enable multi-axis articulation within weight constraints
- Autonomous ground vehicles and mobile platforms requiring synchronized motor control for differential drive locomotion with predictable speed characteristics
- Precision positioning systems in laboratory automation and 3D printing applications where low-speed high-torque characteristics enable fine mechanical control
- Gearbox and drivetrain test platforms in mechanical engineering laboratories where standardized motor specifications facilitate reproducible experimental data collection
How to Use
The Pololu 4790 / 4791 Micro Metal Gearmotor integrates seamlessly into microcontroller-based projects through standard motor driver modules such as L298N H-bridges or specialized Pololu motor drivers. Connect the motor leads to the driver outputs ensuring correct polarity for desired rotation direction, then apply PWM signals to the driver input pins to modulate speed from zero to maximum rated RPM. The integrated reverse-polarity protection diode prevents damage from accidental polarity reversal, though correct wiring practices remain essential for optimal performance and longevity.
For closed-loop control applications requiring speed feedback, attach a Pololu quadrature encoder to the 3mm output shaft using the D-shaped flat as a positive mechanical reference. This enables implementation of PID control algorithms that maintain consistent speed despite varying load conditions. Always ensure adequate current capacity in your motor driver circuit, typically 0.5 to 1.0 amperes per motor at rated voltage. For battery-powered applications, calculate runtime based on battery capacity and motor current draw under typical load conditions. Mechanical coupling to wheels or load mechanisms should employ flexible couplings or the standard Pololu mounting hardware to minimize stress on the output shaft bearing.
Frequently Asked Questions
What is the no-load current draw at 6V for this gearmotor?
The Pololu 4790 / 4791 draws approximately 0.15 to 0.2 amperes at 6V under no-load conditions, making it suitable for battery-powered applications. Current increases proportionally with mechanical load, typically reaching 0.5 to 0.8 amperes under continuous operational torque. This specification is critical for calculating battery runtime in autonomous systems and selecting appropriate motor driver components with adequate current handling capacity.
Can I operate this motor at voltages other than 6V?
While rated for 6V operation, the Pololu 4790 / 4791 can operate across a voltage range of approximately 3V to 9V. Operating at lower voltages reduces speed and torque proportionally, while higher voltages increase both parameters but reduce motor lifespan due to accelerated brush wear. For extended operational life, maintain voltage within the 5V to 7V range. Always verify your motor driver and power supply can handle the selected voltage without exceeding component ratings.
Is this motor compatible with Pololu encoders and mechanical components?
Yes, the 3mm output shaft with D-shaped flat is specifically designed for compatibility with Pololu's extensive ecosystem of encoders, wheels, couplings, and mounting brackets. This standardization eliminates custom fabrication requirements and enables rapid prototyping. The D-shaped flat prevents rotational slippage, ensuring reliable mechanical power transmission to attached components. Verify encoder specifications match your microcontroller's input capabilities before integration.
What is the maximum continuous torque this motor can deliver?
The Pololu 4790 / 4791 delivers approximately 0.8 kg-cm continuous torque at 6V rated voltage. Peak torque under stall conditions can reach 1.2 to 1.5 kg-cm momentarily, but sustained stall operation generates excessive heat and rapidly degrades motor brushes. Design mechanical systems to operate within continuous torque specifications to ensure motor reliability and extended operational lifespan. For applications requiring higher torque, consider stacking multiple motors or selecting higher-ratio gearboxes.
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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- Returns: 7-day return policy on manufacturing defects only
Buy Pololu 4790 / 4791 Micro Metal Gearmotor LP 6V - 380:1 gear ratio Online in India
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