1. What is a Frameless Torque Motor?
Frameless Torque Motor is a special type of motor that is different from the traditional motor structure. It usually consists of a rotor and a stator, but there is no fixed external structure or frame. Therefore, it is also called "backless motor" or "flat motor".
A frameless torque motor is a linear drive motor that generates torque directly on the load without the traditional mechanical speed change device. Compared with traditional motors, frameless torque motors have higher efficiency, precision and dynamic performance.
2. Working Principle of Frameless Torque Motor
The frameless torque motor is a frameless permanent magnet motor that uses output torque as a measurement indicator. Its basic operation is the same as that of a traditional permanent magnet motor. The frameless torque motor is powered by a driver, which controls the U/V/W three-phase electricity to form an electromagnetic field, and the rotor of the permanent magnet rotates under the action of this magnetic field.
The frameless torque motor can use the Hall element as a feedback signal, or it can use the encoder signal installed separately as feedback.
The driver compares the feedback value with the target value and adjusts the angle of the rotor rotation to achieve the purpose of servo control.
3. Structure of Frameless Torque Motor
The frameless torque motor is different from the traditional permanent magnet motor. It has no housing (also called "frame"), and only two parts: the rotor and the stator.
The emergence of the frameless torque motor makes the machine structure design no longer subject to the constraints of the motor housing. The machine's own bearings are used to support the rotor, and the motor is seamlessly built into the machine's design.
The frameless torque motor gives mechanical design engineers more flexible structural design authority, making mechanical design more flexible!
4. Frameless Torque Motor Application
Frameless torque motors are widely used in many fields and applications, including:
Machine tools and industrial automation: provide high-speed, high-precision positioning and motion control;
Robotics: used for joint drives and robot arms;
Medical equipment: such as position control in surgical robots and imaging instruments;
Aerospace: used for propulsion systems and navigation control.
5. Advantages of Frameless Torque Motors
As a power source, the frameless torque motor has the same purpose as the traditional servo motor, but has obvious advantages in certain applications.
■ Extremely high stiffness: The frameless torque motor can be used as a direct drive power source. It does not require belts and pulleys, screws or gearboxes to directly drive the load.
■ High efficiency: Since the frameless torque motor is directly integrated into the structure of the machine, the wind friction loss is reduced, so the efficiency is high.
■ Quiet: Since the frameless torque motor is directly integrated into the structure of the machine, the transmission method is changed (even without a reducer), which brings a significant quiet effect.
■ High stability and low maintenance: Since the frameless torque motor is directly integrated into the structure of the machine, the parts used are reduced, so the machine is easier to work stably.
6. Market Structure of Frameless Torque Motors
The global leader is Kollmorgen, and there is still a gap in product performance between domestic and foreign manufacturers. Kollmorgen of the United States is the global leader in frameless torque motors, with more than 70 years of experience in motion control research and development, and its motor performance is in the first echelon globally. Domestic companies that are currently making rapid progress include Kinco and Guizhou Space Appliance. The global frameless torque motor market size was valued at USD 669 million in 2022 and is expected to reach USD 1.217 billion in 2029.
7. Advantages of HONEST Automation Assembling Frameless Torque Motor
HONEST Automation provides high-efficiency and precision motor assembly equipment for leading humanoid robot companies worldwide. With mature robotic motor assembly solutions, we support customized requirements and help customers enhance production efficiency. Our one-stop service ensures a seamless process from solution design to equipment delivery, creating greater value for our customers. Contact a technical expert now to get a free customized scheme and quotation.
