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Kitbots Saifu 3 motor showing stator front view

Saifu 3 Antweight Combat Robot Weapon Motor - Image 2

Saifu 3 Antweight Combat Robot Weapon Motor - Image 5

SKU: kb-saifu3-weapon-motor Categories: Hubmotor Weapons, Motors, Robotic Components, Robotics Tag: saifu_maint Brand: Kitbots

Saifu 3 Antweight Combat Robot Weapon Motor

Name: Saifu 3 Antweight Combat Robot Weapon Motor
SKU: kb-saifu3-weapon-motor
Availability: InStock

Saifu 2/3 Weapon Motor + Magnet Ring — Short Description

Upgrade or replace the Saifu beater drive with this 2300kV Kitbots Saifu weapon motor + magnet ring assembly designed for Saifu 2 and Saifu 3 hubmotor setups. This Saifu hubmotor has been successful for many years in the arena! The stator bolts to the chassis; the supplied magnet ring bonds inside your beater bar to form the rotor—creating a belt-free, direct-drive hubmotor once installed. Our ItGresa version ships with an MR30 connector pre-installed for clean, fast wiring (three-phase). The magnet ring is not pre-installed; the designer recommends a small amount of Goop-type adhesive for a secure fit and full cure. Tuned KV delivers quick spin-up without sacrificing reliability or thermal headroom. Battle-tested, simple, and serviceable—keep a spare in your pit so you can swap and get back in the box fast.

$50.00

6 in stock (can be backordered)

Saifu V3 Antweight Combat Robot Chassis Kit Fingertech Lightweight Twist Hubs

New Improved Kitbots Saifu Weapon Motor for Saifu 2 and 3 Antweight Beater Bars and kits

Kit includes the motor stator and the magnet ring.

This motor does come with an MR30 connector, suitable for brushless motors.
NOTE: The build instructions state that a connector is NOT installed but the ItGresa Motor DOES have the connector installed. Like most combat robotics brushless motors, these motors have THREE connections.

The stator is mounted to the chassis and the magnet ring is mounted inside the beater bar. The Kitbot Instructions indicate that the magnet ring IS installed in the Beater Bar, but it is actually NOT installed. The manufacturer suggests a small amount of goop adhesive to install the magnet ring inside the beater bar.

Features

Compatible with Saifu 2 and Saifu 3 chassis
Includes MR30 connector for fast plug-and-play wiring
Hub-motor design drives beater bar, no belts
Fewer parts for higher reliability under impact
Battle-tested design with proven multi-season durability
KV tuned for Saifu chassis and beater bar

Routine Checks

Before each event, power off and spin the beater by hand to confirm smooth rotation. Verify the motor is firmly mounted and centered in the Saifu chassis. Inspect the MR30 connector for a tight fit and no discoloration. Check for wire chafe where leads exit the motor; add heat-shrink or a small strain relief if needed. Check batteries for signs of puffing or damage; safely dispose of damaged packs per LiPo guidelines (do not puncture or incinerate). See: LiPo and combat robot safety.

Replacement Parts

Keep spare MR30 connectors, heat-shrink, and motor screws on hand. If you notice vibration or noise, inspect the magnet ring and bearing surfaces; replace fasteners or the ring if damaged. Replace any heat-stressed wiring or connectors immediately. See maintenance parts list.

Battery & Safety

Match your ESC settings to the motor’s KV and your pack voltage to avoid overspeeding. After hard hits, recheck set screws and mounting hardware. Allow the motor to cool before repeated test spins; prolonged stall or binding can overheat windings. Always spin up your weapon in a proper arena or a well-built test box. Robots are dangerous—use a LiPo bag when charging, follow event rules, and ensure adult supervision for minors. Build a box: FingerTech Test Box Instructions (PDF).

⚠️ SAFETY WARNING: Weaponized robots are not toys. Spinning weapons generate extreme kinetic energy—comparable to a power tool. Always engage a weapon lock and test only within a secure arena or test box.

Resources for robot safety and safe testing:

Basic Specifications

Specification	Details
Motor Diameter	1.09in (28mm)
Motor Height	0.46in (11.7mm)
Motor Weight	0.56oz (16g)
Motor KV (rpm/V)	2300kV
Wire length (incl. MR30)	2.5in (63.5mm)
Motor + wire length (overall)	3.5in (89mm)
Magnet ring Diameter	1.1in (28mm)
Magnet ring Height	0.28in (7.1mm)
Magnet ring Weight	0.28oz (8g)
Total Weight	0.84oz (24g)

Will this motor fit Saifu 2 and Saifu 3?

Yes. It mounts directly to Saifu 2 and Saifu 3 chassis and is designed to drive the beater bar as a hubmotor.

Why doesn’t this motor have an outer case?

This is a hubmotor built around an outrunner. The weapon itself forms the rotor (outer ring), so there’s no separate can—fewer parts, less to fail, and direct power to the beater.

What’s a hubmotor?

A hubmotor is an outrunner where the driven part (wheel, disc, or beater) attaches around the motor’s can instead of riding on a separate pulley/shaft. Benefits: fewer parts, no belts, compact packaging. Trade-offs: alignment and balance matter more, and the adhesive joint and bearings see direct impact loads.

Do I need belts or pulleys?

No. The hubmotor drives the beater directly. This assembly has two parts: the stator (mounts to the chassis) and the magnet ring (seats in the weapon and is glued). The designer recommends Goop adhesive. Clean and scuff both mating surfaces, apply evenly, and allow a full cure. Always test-spin in a safe box.

What connector does it use?

An MR30 connector is included for quick, reliable plug-in. Keep the contacts clean and fully seated.

How was the KV chosen?

The KV is tuned for the Saifu beater mass and typical pack voltage to balance fast spin-up with reliability and thermal headroom.

What should I check after a big hit?

Verify motor mount screws, the adhesive bond at the magnet ring, and the MR30 connection. Spin the beater by hand to confirm no rubbing or binding, then do a brief low-throttle test in a proper test box. If you feel new vibration, re-balance or re-seat the ring before the next match.

Can I use this on other bots?

Possibly. If your weapon bore and depth match the magnet ring and your chassis can mount the stator securely and coaxially, it can work well. Confirm clearances, balance, and ESC limits; test thoroughly.

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