25MM FRAMELESS MOTOR
Updated: Oct 18
The MTI-3556 motor serves as a benchmark for high-power-density, small-frame (25mm) integration. From a technical standpoint, its specifications reveal a highly optimized design for high-velocity, low-inertia applications:
Torque Density: Despite a total weight of only 25g, the unit achieves a rated torque of 0.032 N.m, driven by a 14-pole radial flux configuration.
Velocity Dynamics: A rated speed of 18,875 RPM (maxing at 22,650 RPM) allows for high reduction ratios in robotic joints or high-tip-speed propeller modulation in UAVs.
Electrical Efficiency: Operating at 24V with a rated power of 63W, the motor utilizes a low voltage constant (0.75 V/kRPM), necessitating high-frequency switching and precise Field-Oriented Control (FOC) for optimal performance.
Integration and Thermal Management
The "frameless" nature shifts critical mechanical responsibilities to the system designer. Concentricity is the primary challenge; the stator and rotor must be aligned with micron-level precision to maintain a uniform air gap, preventing cogging torque irregularities or mechanical contact.
Thermal dissipation in the MTI-3556 series is purely conductive. Without an internal fan or dedicated housing, the motor utilizes the host structure (typically aluminum or composite) as a heat sink. The insulation resistance (≥50MΩ/500VDC) ensures dielectric stability even under the high thermal loads associated with high-duty-cycle robotics.
For applications in cinematic gimbals, aerospace actuators, and surgical robotics, the MTI-3556 offers a performance ceiling that other motors cannot match. By eliminating redundant mechanical interfaces, designers can achieve superior torque-to-weight ratios and reduced system-level inertia, provided the mechanical housing and thermal paths are engineered to support the core’s high power output.
SPECIFICATIONS
MECHANICAL SPECIFICATIONS: |
Total weight: 25g |
Cable size: AWG24 |
Number of poles: 14 |
ELECTRICAL SPECIFICATIONS: |
Insulation resistance: ≥50MΩ/500VDC |
Dielectric strength: 660VAC/1S/5mA |
Rated power: 63W |
MOTOR SPECIFICATIONS: |
Rated voltage: 24VDC |
Rated torque: 0.032N.m |
Max. torque: 0.064N.m |
Torque coefficient: 0.012 Nm/Arms |
Voltage constant: 0.75 V/kRPM |
Rotor inertia: 0.0015 10^-4kg.m² |
Rated speed: 18,875 rpm |
Max. speed: 22650 rpm |
Rotation: CCW |
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