A New Development in the Field of Frameless Torque Motors: 64 Poles, 240 Nm Torque – All at Just 30 RPM

🔍 What sets this motor apart from the market?
64 Poles (!!!)
An exceptional number that enables high torque at very low speeds – ideal for ultra-precise Direct Drive applications.

Massive torque at virtually zero speed (30 RPM)
The concept of high torque at low RPM means you’re getting a very precise power motor, without a gearbox, with relatively good efficiency (52%–66%).

Relatively high inertia:
Allows for smooth and controlled acceleration – ideal for industrial applications, medical imaging (MRI/CT), or heavy precision platforms.

Voltage constant (Kb) of approx. 2300 V/krpm (!) – This means a high supply voltage is required, but the back EMF is extremely high, reflecting a highly accurate winding design.

💥 Key Engineering Achievements:
🧠 Frameless Motor – 410 mm diameter
Maximum Torque:
🔸 240.14 Nm (!)

Continuous Stall Torque:
🔸 164.66 Nm @ 110°C

Torque Constant (Kt):
🔸 21.95 Nm/A – very efficient!

Peak Current:
🔸 Only 10.94A → extremely efficient for this level of torque.

Continuous Power at Just 30 RPM:
🔸 513 W at 164 Nm (astonishingly effective at low torque/low speed)

One can see that extremely high torque is maintained up to a speed of 30 RPM, indicating optimal suitability for Direct Drive applications. At the same time, power increases gradually as speed rises – a rare combination of power, stability, and efficiency in low-load, slow-speed applications.

In the world of precise and custom-tailored motion, the MF Series by Allied Motion redefines the limits of performance. These motors were originally developed for industrial and military applications where a rare combination of high torque, full motion control, and near-total mechanical silence is required.

The newly developed version within the series includes significant engineering improvements, yielding extraordinary technical values. It features an impressive external diameter of 410 mm, a frameless design that allows for flexible integration, and engineering that delivers maximum torque – even at minimal rotational speeds. All of this while meeting high energy efficiency and strict thermal requirements.

Why does this matter to engineers?

• High torque at low speed – eliminates the need for gear mechanisms, saving on noise, weight, and maintenance

• High inertia – supports smooth transitions and precise movement without jerks

• Exceptionally high voltage constant (Kb ≈ 2300 V/krpm) – reflects a precise coil design translating into clean energy and smooth control

• Efficient under variable working conditions – from 45°C to 110°C without performance loss

Advanced applications that benefit from this solution:
Industry:

• Heavy and sensitive robotic arms

• Imaging systems and non-destructive testing

• Precision rotary tables (CNC, induction)

• Complex Gimbal platforms with inertial sensors

Defense and dedicated systems:

• Stabilization of tactical antennas and satellite communication systems

• Accurate tracking of moving targets

• Actuation for operational laser systems

• Advanced ground and aerial robotics

Overview – MF Series

Key Parameters of the New Version

Customization and Expansion Options

• Various cooling solutions: natural air, cooling fins, integration with heat sinks

• Support for encoders, resolvers, or customized feedback solutions

• Integration possible with Allied Motion controllers or third-party drivers

• Available in configurations compatible with IP ratings and harsh environments

Conclusion

The new generation of MF motors doesn’t just meet today’s standards – it redefines them. The combination of precise mechanical design, exceptionally high torque potential, impressive dynamic resolution, and intelligent integration capability positions this solution as a cornerstone in the development of next-generation motion systems.

Engineers and developers working on critical systems – from precision industry to national defense – are invited to rediscover what a Frameless Motor can truly do.