Are Frameless torque motor brushless?
 Nov 07, 2024|View:16

Frameless torque motors are indeed brushless, as they utilize electronic commutation rather than mechanical brushes and commutators found in traditional DC motors. Here's a detailed explanation of frameless torque motors and their brushless nature:


What Are Frameless Torque Motors?

Frameless torque motors are a type of electric motor that is designed without a housing, end bells, bearings, rotor shaft, and cable connectors that are typically found in housed motors. Instead, these elements are incorporated into the application design, allowing for greater flexibility and customization. These motors are brushless, meaning they do not use physical brushes to commutate the motor; instead, they rely on electronic commutation.


Brushless Operation

The term "brushless" refers to the absence of carbon brushes that are traditionally used in DC motors to transfer current from the stator to the rotor. In brushless DC motors (BLDC), the commutation is done electronically, which results in several advantages such as reduced maintenance, higher efficiency, and longer lifespan. The electronic commutation is achieved through the use of sensors or Hall effect devices that detect the position of the rotor and switch the power to the appropriate windings in the stator to maintain rotation.

Frameless torque motor

Advantages of Brushless Frameless Torque Motors

High Torque Density: Frameless torque motors offer high torque for their size, which is crucial in applications where space is at a premium.

Compact Design: The lack of a frame allows for more compact and powerful designs, making them ideal for applications where size and weight are critical.

Reliability: Without the wear and tear associated with brushes, brushless motors are more reliable and have a longer service life.

Precision: The electronic commutation provides precise control over the motor's speed and torque, which is essential in applications requiring high precision.

Low Inertia: Frameless motors often have low inertia, which allows for faster response times and better dynamic performance.

Applications of Frameless Torque Motors

Frameless torque motors are used in a variety of applications where high torque, precision, and compact size are required. These include:


Robotics and Industrial Automation: They enable compact and powerful robotic joints, enhancing the performance of surgical robots, industrial cobots, and more.

Control Actuator Systems: They deliver optimal torque and speed in confined spaces, withstanding shocks and vibrations.

Submersible Vehicles and Robots: They can be sealed for protection against subsea pressures or hazardous liquids.

High-Vacuum and High-Radiation Environments: Suitable for space vehicles and medical devices where materials resist outgassing and degradation.

Food & Beverage Production: Hygienic designs prevent washdown fluids from coming into contact with the motor.

Frameless torque motors are a sophisticated choice for applications that demand high performance, precision, and reliability. Their brushless design contributes to their efficiency and longevity, making them a popular choice in many industries. The combination of electronic commutation and the absence of a physical frame provides a versatile and powerful solution for engineers looking to optimize their designs.


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Changzhou Sunrise Electric Motor Company was founded in 2004 and is located about 200 km west of Shanghai.

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