Arrma 550 14T Brushed Motor - Black
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Product Information
Full details
This Arrma MEGA 550 14T brushed motor is designed for RC enthusiasts seeking exciting and consistent performance with simple, reliable brushed power. It offers a great balance of speed and torque for various conditions at an incredible value, with the main caveat being its brushed nature which may not appeal to those seeking brushless performance. Key features include a 14-turn, 550-size design, ARRMA branding, and compatibility with 6-7 cell NiMH or 2S LiPo batteries.
All features
| Model Part Number | ARA390307 |
|---|---|
| Brand | Arrma |
Extended Product Information
FAQs
What is the advantage of a 14T motor?
A 14-turn motor offers a good balance between speed and torque. It provides more torque than higher-turn motors (e.g., 17T, 19T) for better acceleration and low-end grunt, while still offering respectable top speeds for general RC use.
Can I use a 3S LiPo battery with this motor?
No, this motor is rated for up to 2S LiPo (7.4V) or 6-7 cell NiMH batteries. Using a 3S LiPo would likely exceed the motor's and compatible ESC's voltage limits, causing damage.
How often do I need to replace the brushes?
Brush life varies greatly depending on usage. Inspect them regularly, typically every 10-20 runs or if performance drops. Replace them when they are worn down to about half their original length or show significant wear.
Does this motor come with a cooling fan?
No, the Arrma 550 14T brushed motor does not include an integrated cooling fan. If overheating is an issue, you would need to purchase a compatible motor fan and heatsink separately.
What ESC is recommended for this motor?
You need a brushed-compatible ESC that can handle the voltage you intend to use (e.g., 7.4V for 2S LiPo) and is rated for a motor of this size and turn count. Check the specifications of your ESC to ensure compatibility.
How do I clean the motor?
Disconnect the battery before cleaning. Use compressed air to blow out dust and debris from the motor vents. A soft brush can also be used gently. Avoid using liquids directly on the motor.
Troubleshooting
Motor runs slow or lacks power
Check battery charge level and voltage. Ensure gear mesh is not too tight. Inspect motor brushes for wear and clean commutator. Verify ESC settings and compatibility.
Motor overheats quickly
Reduce gearing (use a smaller pinion or larger spur gear). Ensure motor vents are clear and consider adding a heatsink or fan. Check for binding in the drivetrain. Avoid prolonged high-load operation.
Motor stops working intermittently
Check all electrical connections between the battery, ESC, and motor. Inspect motor brushes and commutator for debris or damage. Ensure the ESC is not overheating or cutting out due to low voltage or thermal protection.
Unusual noises from the motor
Check motor bearings for smoothness. Ensure the motor is securely mounted and that the pinion gear is properly seated on the motor shaft and meshed with the spur gear.
Pros and Cons
Pros
- Offers a good balance of speed and torque for everyday RC driving.
- Compatible with both NiMH and LiPo batteries, providing flexibility.
- Provides exciting performance at an accessible price point.
- Reliable and consistent power delivery for its class.
- Durable construction for general use.
Cons
- As a brushed motor, it will not match the efficiency or top-end performance of brushless systems.
- Requires periodic maintenance like brush cleaning and replacement.
- May generate more heat than comparable brushless motors under heavy load.
- Limited adjustability compared to programmable brushless ESCs.
- Not intended for extreme high-performance applications.
Setup, Compatibility & Care
Setup:
This motor is designed as a direct replacement or upgrade for many ARRMA vehicles. Ensure proper alignment with the pinion gear and spur gear to achieve the correct mesh. Securely fasten the motor to the motor mount.
Compatibility:
- Recommended for use with 6-7 cell NiMH batteries (7.2V - 8.4V) or 2S LiPo batteries (7.4V).
- Requires a compatible Electronic Speed Controller (ESC) rated for brushed motors and the voltage you intend to use.
- Ensure your vehicle's gearing is appropriate for a 550-size, 14-turn motor to avoid overheating.
Care:
- Cleaning: Periodically remove dust and debris from the motor casing and vents using compressed air or a soft brush.
- Brushes: Brushed motors require brush maintenance. Inspect brushes for wear and replace them if they are significantly diminished to prevent damage to the commutator. This typically involves disassembling the motor end bell.
- Cooling: Ensure motor vents are clear and consider adding a heatsink or fan if running in very hot conditions or under sustained high load.
- Lubrication: No lubrication is typically required for the motor itself; focus on gear mesh lubrication for the drivetrain.