6.3:1 Metal Gearmotor 37D×65L mm 12V with 64 CPR Quadrature Encoder (Helical Pinion)
Need a fast, tough gearmotor with feedback for precise control? The Pololu 4757 combines a powerful 12V brushed DC motor with a 6.25:1 all-metal gearbox and an integrated quadrature encoder. It’s a great choice for robots and mechatronics builds that need real speed, solid torque, and reliable RPM/distance tracking (odometry).
The first gearbox stage uses helical gears (helical pinion) for reduced noise and improved efficiency, while the rest is mainly spur gears.
Best for
- 2WD/4WD robot drive trains (fast, responsive)
- Odometry / distance tracking using encoder counts
- Speed control (PID RPM) and smooth acceleration profiles
- Wheels, rollers, feeders, mini conveyors, and fast mechanisms
Why/Benefits
- Fast + controllable: low gear ratio gives higher output speed while still providing useful torque for drive systems.
- Built-in feedback: quadrature encoder supports direction + speed measurement for closed-loop control.
- Metal gearbox durability: better for real loads than plastic gear trains.
- Cleaner drive feel: helical first stage helps reduce noise and improves efficiency.
Technical specifications
| Model | 6.3:1 Metal Gearmotor 37Dx65L mm 12V with 64 CPR Encoder |
|---|---|
| Motor type | 12V brushed DC motor with metal gearbox |
| Gear ratio | 6.25:1 |
| Encoder | Integrated quadrature encoder |
| Encoder resolution | 64 CPR (motor shaft) / 400 CPR (gearbox output shaft) |
| Gear train | Mainly spur gears; helical first stage (helical pinion) for reduced noise & better efficiency |
| Output shaft | 6mm diameter D-shaft, 16mm long |
| Performance @ 12V (reference) | Max efficiency point: ~47% at 4.9 kg·mm, 1300 rpm, 1.2A Max power point: ~12W at 15 kg·mm, 760 rpm, 3.1A Stall (approx): 30 kg·mm, 5.9A; No-load current: 0.18A |
Pinout & power notes
- Motor leads: connect to your driver’s OUT terminals (swap polarity to reverse direction).
- Encoder outputs: use quadrature A/B signals for speed/direction; connect GND to your MCU ground.
- Driver sizing: choose a motor driver with enough headroom for your load and stall current.
FAQ
-
How many encoder counts do I get per output shaft revolution?
This model outputs 400 counts per revolution of the gearbox output shaft.
-
Is this good for fast robot wheels?
Yes—6.25:1 is on the faster side for 37D gearmotors, ideal for responsive drive bases (use a driver that can handle current spikes).
-
What wheels fit the shaft?
It uses a 6mm D-shaft, compatible with many 6mm hubs/adapters and common robotics wheel systems.
6.3:1 Metal Gearmotor 37Dx65L mm 12V with 64 CPR Encoder
6.3:1 Metal Gearmotor 37Dx65L mm 12V with 64 CPR Encoder
Low stock: 1 left
Product Code
SKU:POL4757
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