Megaflux™ Frameless Torque Motors

Motors

What is a Frameless Torque Motor?

Frameless Torque Motors are motors without an external housing, supplied as separate stator and rotor components. Unlike conventional motors, they are designed to integrate directly into the customer’s mechanical structure. This configuration offers full design freedom for the engineer, reduction in weight, increased efficiency, and excellent dynamic performance.

Principle of Operation

Ring-shaped structure with a high diameter-to-length ratio.
Direct drive onto the moving axis, eliminating the need for gearboxes, shafts, or couplings.
Eliminates mechanical gaps, vibrations, and resonances.

Advantages of Megaflux™ Series Motors

Very high torque density – providing exceptional torque relative to weight and size.
Compact and slim structure – ideal for systems with strict space requirements.
Efficient heat dissipation – enabling sustained operation under high loads.
Elegant solution – for passing cables, fluids, or laser beams through the motor center.
Superior mechanical precision – by minimizing backlash and complex mechanics.
Wide range of sizes, voltages, and customized versions available.

Megaflux™ Frameless Torque Motors – Comprehensive Technical and Engineering Analysis

Structure of a Frameless Torque Motor

A Frameless Torque Motor consists of two main components:

Stator: Fixed part containing electrical windings.
Rotor: Rotating part with mounted permanent magnets.

The motor is supplied without a housing or built-in bearings and is intended to be directly integrated into the mechanical assembly.

Structural Characteristics:

Winding configured in standard WYE (star) connection.
Electrical control circuits are external (external motor controller).
Rotor built with high-strength Neodymium (NdFeB) magnets.

Operating Principles

During operation:

Electric current through the stator windings generates a rotating magnetic field.
The magnetic field interacts with the rotor’s permanent magnets.
A direct rotational torque is produced and transmitted to the moving shaft — pure direct drive with no energy losses through gearboxes or couplings.

Design Advantages:

Immediate dynamic response due to low inertia.
Very high positional accuracy.
Direct power transmission with zero mechanical backlash.

Engineering Advantages of Megaflux™ Series Motors

Parameter	Technological Advantage
Torque Density	One of the highest torque-to-weight ratios globally – optimal current-to-weight design.
Clear Aperture (Internal Bore)	Allows passage of cables, fluids, or optics through the motor center.
Reduced Cogging Torque	Special magnetic and winding design for minimizing torque ripple, enhancing precision.
Broad Customization Options	Availability of 48, 150, and 300VDC windings, customized for high speed or high torque needs.
Hall Sensors Integration	Supports precise commutation and enables closed-loop control systems.

Custom Adaptations in Megaflux™ Motors

Allied Motion offers full flexibility to meet any requirement:

Custom Winding: Winding adaptations for non-standard supply voltages (e.g., 24VDC, 600VDC).
Thin Laminations (MFS version): Optimized for very high rotational speed applications.
Integrated Hall Sensors: Rotor position detection for automatic commutation.
Special Mechanical Configurations: Custom internal/external diameters, stack lengths, stator/rotor mounting options.

Advanced Military Applications of Frameless Torque Motors

Application	Specific Advantages of Megaflux™
Camera / Sensor Stabilization	Lightweight motors with fast response to eliminate vibrations.
Smart Weapon Sight Systems	Stable and precise torque to enhance targeting accuracy.
Robotic Platforms (UGVs)	High torque motors with minimal moving parts for rugged field operation.
Autonomous Underwater Vehicles (UUVs)	High energy efficiency in wet, high-pressure environments.

Influence of Size and Diameter on Frameless Motor Performance

Larger diameter → Higher torque per unit length but lower maximum rotational speed.
Smaller diameter → Higher rotational speeds, suited for dynamic, fast-response applications.
Stack Length → Directly affects torque output: longer stack = higher torque.

Choosing the correct diameter and stack length is critical for successful system design.

Frequently Asked Questions (FAQ)

What is the difference between a Frameless and an Integrated Motor?

Frameless Motor: Requires integration into a custom mechanism (only stator and rotor provided).
Integrated Motor: Comes complete with bearings, motor housing, and packaging — a plug-and-play solution.

How do you select the appropriate Megaflux Motor?

Selection based on continuous torque requirements, rotational speed, size/weight constraints, and supply voltage.

Why use 300VDC instead of 48VDC?

Higher voltage reduces currents → reduces losses → improves efficiency, ideal for high-power applications.

Summary

Megaflux™ Frameless Torque Motors offer an ultimate solution for applications demanding precision, reliability, high torque density, and dynamic response.
Whether in medical robotics, smart optics, or advanced military systems — Megaflux motors set a new benchmark in performance.

Example Military Applications of Megaflux™ Motors

1. Stabilizing an Advanced Weapon System on a Combat Vehicle

System: Heavy machine gun / automatic cannon mounted on a tactical off-road vehicle (ATV/UGV).
Challenge: Stabilizing the firing barrel during fast movement and rough terrain.
Solution: Integrating Megaflux MF0150 or MF0210 motors on elevation and azimuth axes enables immediate stabilization with high torque and dynamic response, without mechanical backlash.

Advantages: Improved firing accuracy over long distances, high durability in battlefield conditions.

2. Gimbal Platform for Missile Guidance

System: Lightweight two-axis gimbal used for laser-guided missiles.
Challenge: Maintaining precise directional stability at varying speeds.
Solution: Installing Megaflux MF0076 motors on both axes enables smooth tracking, sufficient torque for optical payloads, and vibration-free operation.

Advantages: Enhanced targeting precision, rapid system response.

3. Tactical UAV Propulsion Axis Control

System: Foldable rotor/propeller system in a small tactical UAV.
Challenge: Weight saving, energy efficiency, and high-temperature resilience.
Solution: Utilizing Megaflux MF0060 or MF0095 motors as axis drivers achieves an ideal torque-to-weight ratio, high speed, and reliable operation at high altitudes.

Advantages: Extended flight range, excellent stability in variable wind conditions.

4. Robotic Submarine (UUV) – Silent Propulsion System

System: Autonomous underwater vehicle used for intelligence gathering or patrols.
Challenge: Extremely silent propulsion, efficient energy use, long operational endurance.
Solution: Implementing Megaflux MF0210 motors with customized windings for direct propeller drive, ensuring low current consumption and minimal acoustic signature.

Advantages: Acoustic stealth, prolonged underwater mission duration.

5. Ground Radar Stabilization System

System: Mobile radar antenna mounted on an off-road vehicle or portable launcher.
Challenge: Maintaining precise directional stability during movement and ground vibrations.
Solution: Using Megaflux MF0210 or MF0255 motors for azimuth and elevation drives ensures real-time stabilization and high torque to overcome external forces.

Advantages: High scanning speed, accurate tracking, reduced mechanical wear.

6. Military Laser System for Missile Interception

System: Laser cannon mounted on a vehicle or ship.
Challenge: Stabilizing a high-power laser beam under vibration and motion conditions.
Solution: Using Megaflux MF0127 or MF0150 motors for two-axis laser head stabilization.

Advantages: Maintains precise targeting spot under changing conditions, fast dynamic response.

7. Stabilizing Observation and Guidance Pods for Interceptors

System: Optical or lightweight radar pod for target acquisition and interception management.
Challenge: Reducing vibrations and maintaining sharp focus on fast-moving targets.
Solution: Installing MF0060 or MF0076 motors in optical stabilization mechanisms.

Advantages: Instant response, precise tracking of fast-moving objects.

Scenario Summary

Megaflux™ Motors provide an ideal solution for:

Weapon stabilization systems
Missile guidance systems
Unmanned platforms (aerial and ground)
Maritime intelligence collection systems

Thanks to their precision, rapid dynamic response, and superior energy efficiency, they serve as a critical component in modern defense systems.

Guide for Selecting a Frameless Megaflux Motor for Military Applications

Start:

Select a Frameless Megaflux Motor for Military Use

Step 1:

Question: Is the application stabilizing a small sensor or optical gimbal?

Yes → Proceed to the next question.
No → Proceed to Step 2.

Intermediate Step (for sensor/gimbal):

Question: Is ultra-lightweight and fast response required?

Yes → Choose MF0060 or MF0076 motors.
No → Choose MF0095 motor.

Step 2:

Question: Is the application propulsion for a ground/aerial platform (e.g., UGV, UAV)?

Yes → Proceed to the next question.
No → Proceed to Step 3.

Intermediate Step (for ground/aerial platforms):

Question: Is the platform lightweight or medium weight?

Yes → Choose MF0127 or MF0150 motors.
No → (Heavy-duty platform) → Choose MF0210 or MF0255 motors.

Step 3:

Question: Is the system an underwater vehicle (UUV) requiring silent propulsion?

Yes → Choose MF0210 with custom low-speed winding.
No → Check high-power demands and choose motors from MF0255 or MF0310 accordingly.

Detailed Selection Table:

Military Application	Guiding Question	Recommended Motor
Small sensor/gimbal stabilization	Is lightweight and fast response required?	Yes ➔ MF0060 or MF0076 No ➔ MF0095
Ground/aerial platform propulsion	Is the platform lightweight/medium weight?	Yes ➔ MF0127 or MF0150 No ➔ MF0210 or MF0255
Underwater Vehicle (UUV)	Is silent propulsion required?	Yes ➔ MF0210 with customized winding
Heavy-load systems (Radar, Laser Systems)	Is very high torque required?	Yes ➔ MF0255 or MF0310