LEM’s new current sensor delivers smallest footprint on the market
Summary
Using open loop Hall effect technology and an innovative magnetic core design, the HSTDR offers excellent immunity against external field and cross talk as well as consistent behaviour over frequency with little part-to-part phase shift dispersion, ensuring more accurate torque control. What makes the sensor unique is not only that it is 42% smaller than its predecessor (LEM’s HSNDR) but also weighs 50% less and offers 50% greater measuring range, as well as best-in-class accuracy and a global error over temperature and lifetime below 3.5%. One way LEM’s designers were able to minimise the footprint of the HSTDR was by making it the only sensor for EV traction inverters, DC link and 3-phase current measurement to feature an integrated busbar, starting with the earlier HSNDR, fitting perfectly into the smallest possible core aperture. Now, with access to a fully calibrated package of core, busbar and sensing element, car component designers and EV manufacturers will have the flexibility to achieve major reductions in their products’ time to market. Says Sofiane Serbouh, LEM’s Global Product Manager, Motor Control: “Based on 50 years’ experience in electrical measurement, LEM is continually pushing the boundaries when it comes to developing the solutions that design engineers in the automotive industry are looking for when working with traction inverters.