Feature sponsored by Test & measurement
IN POLE POSITION
“Our technology's incredibly low latency is particularly useful when the driver needs to respond very rapidly to the stimuli that they get from the motion generator. The information that we provide through the motion generator is very dependent on the use case that our customer is evaluating. For example, automotive ride simulation is all about the vertical dynamics of the car as it goes over the bumps in the road, the cat's eyes, potholes, and rumble strips, and providing a very accurate representation to the driver and the passenger within the vehicle of those things,” says Warne.
SOLUTION
Dynisma selected the LA11 absolute magnetic linear encoder from Renishaw associate company RLS, to enable precise position control of the belt-driven actuators that drive the LFP responsible for large movements (excursions). The LFP comprises three belt driven actuators (ground rails) arranged in a triangle, which interface with the tri-base of the HFP via three passive radial rails. The three ground rails enable motion with three degrees of freedom (longitudinal, lateral, yaw) over a large excursion. In contrast, the HFP employs six actuators to enable six degrees of freedom in a smaller motion envelope but with higher fidelity. In particular, the electronics design of the LA11 absolute encoder provides short response and recovery times. The LA11 encoder also features communications interface options that enable dual output of both absolute position
Instrumentation Monthly June 2023
readings via serial communication and incremental position readings. “The LA11 encoders are all on the low- frequency platform,” continues Bell. “So, on our demonstrator system we have got six on the three ground rails, which are the ones that go radially outwards, and on the customer systems we have nine. The encoders output to Beckhoff safety slices which feed into our safety program where we monitor the position and velocity of the system. As a result, we can safely shut down any system that exceeds its safe performance envelope. “The main requirement for DMG-1 was that we needed an encoder that gave absolute feedback and incremental feedback in the same readhead. We essentially wanted direct feedback to the safety system for both the position and velocity of the relevant axis; if we had to do that with an encoder that only gave us an absolute signal then we would need to fit a different encoder for an incremental signal which takes up more packaging space. The LA11 was ideal because it minimised our space requirements by producing both absolute and incremental signals from one readhead and scale tape.”
RESULTS Renishaw and RLS provided Dynisma with the technical support to help it find and implement the best encoder solution for its application. DMG-1 is now making an impact with customers and the future looks promising.
“Initially we approached Renishaw for a specific requirement on a previous system where they recommended the RLS LA11 encoder. Since then, we realised it was also a great fit for DMG- 1. We are delivering three DMG-1 systems to customers in the automotive and motorsport sector over the next 6 to 12 months and beyond that we have future orders in the pipeline, so we expect to continue that relationship with Renishaw and RLS,” says Bell. For years, Renishaw and RLS have cultivated a working partnership with Dynisma through an extensive and diverse product offering backed by excellent technical and engineering support that has a material impact on customers’ businesses.
“Dynisma delivers projects across the world for our customers in both motorsport and automotive, in Europe, North America and beyond. So, there is already a strong market for new Dynisma products such as DMG-1. We have a very strong working relationship with Renishaw and RLS - their products match our requirements and use cases very well. We have also received excellent product selection help and technical support from both businesses. Dynisma is always focused on developing and expanding our product development roadmap, so we have plans to continue to develop our technology for years to come and we look forward to working with Renishaw and RLS on our future products,” concludes Warne.
Renishaw
www.renishaw.com 39
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