GBM2804H-100T gimbal motor
A 100-turn hollow-shaft BLDC built for camera gimbals: high torque per amp, low speed, zero cogging at low current. The standard testbed for learning FOC.
The role it plays
An actuator turns electrical power into motion. The useful unit is never the motor alone — it is motor + reduction + encoder + driver loop, and most of the engineering is in the last three. The number that decides a design is continuous torque at the joint, not the peak figure on the datasheet. Peaks last milliseconds; gravity lasts all day.
Typical use: Gimbals, haptic knobs, SimpleFOC learning builds, robot wrists.
What the numbers actually mean
The headline figure is ~0.45 N·m (torque), with 100 turns (very low Kv) as the next most load-bearing number (kv). At $35 in the actuators tier it sits in the mid range: enough money that you should plan the mounting and wiring before ordering, but not so much that one mistake ends the project.
How it compares
Same subsystem, closest alternatives. The primary spec column is usually the one that decides it.
| Part | Price | Primary spec | Second spec |
|---|---|---|---|
| GBM2804H-100T gimbal motorBLDC, high-turn | $35 | ~0.45 N·m | 100 turns (very low Kv) |
| Feetech STS3215Serial-bus servo | $17 | 30 kg·cm (2.94 N·m) @ 7.4 V | ~0.222 s / 60° |
| Feetech SCS0009Micro serial servo | $8 | 9 kg·cm (0.88 N·m) @ 6 V | ~0.1 s / 60° |
| Dynamixel XL430-W250-TSmart servo | $50 | 1.5 N·m @ 12 V | 59 rpm @ 12 V |
| Dynamixel XM430-W350-TSmart servo | $260 | 4.1 N·m @ 12 V | 46 rpm @ 12 V |
Where it shows up
Platforms in this atlas that use something in this class: 5-inch FPV freestyle quad.