Frameless Motors Critical for Surgical Robots

Frameless Motors are Revolutionizing Surgical Robotics

Recent advancements in robotics have greatly enhanced surgical procedures, enabling minimally invasive techniques that reduce tissue damage and improve patient recovery times. Much of this innovation is being driven by the increasing utilization of surgical robots, which in turn is demanding the evolution of motion control solutions and the continual miniaturization of components. These advancements are further characterized by the need for seamless, steady, precise, and responsive motion within compact and lightweight envelopes. While these solutions can take many different form factors, one such envelope that has recently emerged to support surgical robotics is the frameless motor.

What is a Frameless Motor?

Frameless motors have emerged in recent years as an optimum solution for control axes that demand precise servo-driven movement, including surgical robot end effectors and robotic joints. These motors are stripped down to the essential components of the stator and rotor and forego the traditional frame, bearings, and shafts to integrate directly into mechanical assemblies to transmit torque. The nature of frameless solutions offers intrinsic advantages over conventional motors; these include weight savings, space efficiency, high torque-to-inertia ratio, enhanced cooling efficiency, and reduced mechanical losses.

Based on years of experience supporting surgical applications, Portescap has developed capabilities to design and manufacture frameless solutions. Typical performances include diameters of up to 127mm, nominal torque of 1,500 mNm, up to 20,000 RPM, and power up to 350W. Furthermore, the ability for customization in windings, shafts, and connectors ensures adaptability to diverse applications.

How do Frameless Motors Benefit Surgical Robots?

Frameless motors are revolutionizing the field of surgical robotics, offering a variety of benefits that enhance both performance and safety. Their compact design allows for precise control and maneuverability within confined spaces, crucial for intricate surgical procedures where precision is paramount. Additionally, these motors generate minimal heat, reducing the risk of tissue damage during prolonged surgeries. Furthermore, their high torque and efficiency ensure smooth and accurate movements, enabling surgeons to perform intricate tasks with unparalleled precision.

Is a Frameless Motor Right for My Surgical Robot?

Determining whether a frameless motor is right for your application can be tricky. Some of the necessary parameters to start any design include speed-torque requirements, power needs, and the physical space available for the motion elements; you’ll also need to evaluate factors such as precision requirements, heat generation, and torque efficiency to determine if this is an ideal solution. The result is typically an iterative process in efforts to optimize the form factor and efficiency of the actuator while also meeting the operating point(s).

Conclusion

With the never-ending advancement in surgical robotics, it is important to recognize the difficult balance between improving performance, commercial value, and integration and compatibility challenges. We recommend selecting an experienced and flexible partner to support you with these challenges throughout the entire development process, especially if you’re considering utilizing a frameless motor for your robotic surgery application. Reach out to Portescap here to start collaborating!