QMT Features: October 2016
Accuracy focus on the power train
An Aberlink CMM is helping CPT make more efficient power train components

Controlled Power Technologies (CPT) specialises in the development of cost-effective CO2 reduction measures for the global automotive industry that avoid major redesign of the powertrain or vehicle electrical system.

Core competencies include low voltage power electronics, advanced control software and the application of low voltage switched-reluctance machines (SRMs) to gasoline and diesel powertrains - providing innovative mild hybrid vehicle solutions.

CPT is focused on bringing its liquid-cooled Cobra, SpeedStart, SpeedTorq and Tigers technology to mass market readiness. Based on the same core SRM architecture, Cobra is a high speed (70,000rpm) motor for electric supercharger applications which shares the same platform as the Tigers high speed (70,000rpm) high temperature tolerant generator for the recovery of thermal and kinetic energy from fast flowing exhaust gases. SpeedTorq is a 20,000rpm SRM designed for low voltage (<60V) mild hybrid applications in the driveline, thereby complementing the SpeedStart engine mounted starter generator. While Cobra is focused on trucks and buses, SpeedStart, Tigers, and SpeedTorq applications are aimed at a wide variety of cars and commercial vehicles.

The advanced nature of CPT’s products and the high rpm speeds they operate at dictates that all critical components have extremely demanding dimensional tolerances. To help ensure that the required levels of manufacturing precision are adhered to the company administers a stringent quality control system. As the demand for CPT’s products is rapidly growing, to allow the company’s inspection function to keep pace with increased production investigations were recently made into the availability of high precision, rapid acting advanced measuring systems. The solution to CPT’s quest for both accuracy and speed of inspection was found in the Axiom Too Coordinate Measuring Machine from Aberlink.

CPT Manufacturing Engineer, Remie Hayter said: “In addition to their designs, the CO2 reduction ability and the reliability of our products is based on the accuracy of their component parts. Although we have a range of precise measuring equipment, when the need occurred to inspect certain geometrical features we have been using external inspection resources. As our production levels have now ramped-up the need for a more efficient, universal component inspection method became more urgent.

“Our Aberlink CMM is able to precisely measure each of the geometric features on all of our components and to provide rapid feed-back to production. In addition we use the Axiom Too to verify the accuracy of received components in our Goods Inward Department; we also use the Axiom Too as an invaluable aid for our R&D department.”

Available in manual and CNC variants, the Axiom Too is Aberlink’s best-selling CMM It has an aluminium bridge with a very low thermal mass, rendering it ideal for use either in controlled environments or within less than perfect shop-floor conditions. Advanced materials give reduced inertia for fast operation and air bearings are used on all axes for optimised stiffness. A granite Y Beam allows preloading of bridge bearings in both directions.

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