39MM FRAMELESS MOTOR
- ADR Communication
- Apr 28
- 2 min read
The MTB-2744 serves as a benchmark for high-torque-density, 39mm frame integration. Its specifications reveal a highly optimized design for high-pole, direct-drive applications:
Torque Density: Despite a total weight of only 27.5g, the unit achieves a continuous torque of 0.053 Nm and a peak torque of 0.31 N.m. This is driven by a sophisticated 26-pole radial flux configuration.
Motion Smoothness: A critical technical advantage of this model is its zero cogging torque. By eliminating the preferred magnetic positions between the rotor and stator, the motor enables ultra-smooth rotation, essential for high-end cinematic gimbals and precision optics.
Electrical Characteristics: Operating at a rated voltage of 72V, the motor features a voltage constant of 0.99 V/kRPM and a torque constant of 0.012 Nm/Arms. Its high pole count makes it ideal for low-speed, high-efficiency operation without the need for a gearbox.
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 .
Thermal dissipation in the MTB 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. With an operating environmental temperature range of -40°C to +80°C, proper thermal modeling of the mounting interface is essential to maintain performance during long duty cycles.
Conclusion
For applications in robotic joints, aerospace actuators, and UAV stabilization, the MTB-2744 offers a performance ceiling that other motors cannot match. By eliminating redundant mechanical interfaces and providing a zero-cogging architecture, designers can achieve superior torque-to-weight ratios and ultra-stable motion control.
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