NSK’s Active Caster – A Step Toward a Marvelous World of Robots
“You have to work to live” is often taken as a matter of fact, but what if that didn’t have to be the case. We are constantly improving, so it might not be too zealous to say that perhaps the ultimate goal of human technological and social progress is a world in which no one has to work. To make this a reality, an important first step is getting robots into more and more workplaces, working side-by-side with humans.
Further, many countries are facing aging populations and labor shortages, and robots are becoming increasingly important not only in manufacturing but also in a service industries. How can NSK’s technology contribute to solving these issues? In this article, we talk with NSK engineers working on “Active Caster” omnidirectional motorized wheels ready to be used in a diverse range of collaborative robot “cobot” and service robot applications!
Profile
Koki Hongo
New Field Products Development Center
Tomoaki Matsui
New Field Products Development Center
What is NSK’s “Active Caster”?
The Active Caster is a motorized wheel unit designed to be used in close proximity to people. For service robots to be useful to people, they must be able to operate in the same spaces as people and move in a way that is considerate of others, so the unit is smart, quiet, and compact. Service robots equipped with Active Casters are currently being field tested and if successful these robots will soon play a role in our workplaces and daily lives.
Related Article: NSK’s New “Active Casters”
One-Size Fits All: Ideal for Diverse Settings and Industries
Hongo Working on the Active Caster project has been very interesting, service robots that interact with people in their daily lives is a very new field and the possibilities are endless. Since joining this project, it really hit home that we are working on something that can directly benefit people’s lives and perhaps even raise our standard of living. It has also given me the opportunity to connect with new customers to solve problems in industries such as medical and logistics.
Actually, in our team, a number of us have family members that work in hospitals and care facilities, which can often be very physically demanding and there are a lot of tasks that must be carried out in a timely manner for the safe and effective recovery of patients. This is just one example, but we think it would be great if Active Casters can take shape as service robots in hospitals: automating medicine carts, transporting medical supplies, moving gurneys, and reducing the overall workload in these busy environments. We have already laid plans to update our Transport Assist Robot* with Active Casters to further improve and help hospital staff including our family and friends to provide the highest quality of care (and avoid back injuries!). It certainly feels good to work on a project that can directly help the people you know as well as society.
*Related Article: NSK Supporting Frontline Healthcare Through Robotics
Matsui Japan and many other countries have aging populations with shrinking labor forces and there are already industries troubled because they can’t hire enough employees. Robots using Active Casters could soon become necessary to automate repetitive and manual tasks and enable humans to focus on other work. Depending on the implementation such robots could even help businesses maintain or grow their competitive edge.
There are also applications in helping people who have limited mobility. Active casters could be used to develop a robot suitcase to make it easier for people to travel or a moving cart that doubles as a walker to help carry things around the house. The walker could be programmed to move out of the way and come back when convenient, giving the user more space when sitting down without having to worry about keeping it within hands’ reach. Thinking about all the different use cases has been quite stimulating.
Playing a Positive Role in a Changing Society
Hongo We are in process of brushing up the design through repeated operation tests. The lab has various surface environments, such as uneven floors, carpets, bumps, and slopes, basically a jungle gym for the test robot (laughs). At present, balancing performance and cost is a point of focus of development. Since Active Casters are equipped with two motors per wheel and control steering and traveling by the difference in their rotational speeds, we need to find smart ways to reduce per unit costs while still providing highly accurate control and performance.
We are utilizing technology and know-how that NSK has cultivated in many fields of research and development to reduce costs, such as through the development of electronic control units (ECU) for electric power steering, as well as optimizing for mass production to make it easy for customers to try out and adopt. In another couple years or so, you may happen to see robots with Active Casters around town.
Matsui If our design can move in all directions, carry heavy loads, and has the power to climb slopes, it will have a wider range of uses. To achieve this, it is necessary to design a gear configuration that can generate enough power, but at the same time, at a very compact size to meet project requirements. Moving forward we will also continue to improve the design by applying NSK’s strengths in bearings and lubrication technology to improve efficiency and durability.
NSK has been manufacturing bearings for more than 100 years, and now the company is closely tied to cutting-edge fields such as collaborative robots and service robots. If you think about it, there are many things that could not be made without bearing and tribology technology, such as bullet trains, high-efficiency motors, and giant wind turbine generators, and working on this project reminded me that NSK is a company that has supported the development of society through essential technologies. As society is changing at an accelerated pace, I am very happy to be an engineer because I have so many opportunities to challenge myself and try new things. Pursuing a new field of business is complicated as there is no base model within the company, but this also makes the work very rewarding. Moving forward, we will continue to communicate closely with our customers and make every effort to be of service to society.
