LEM develops compact current sensors measuring up to ±1,500A in traction inverters

• LEM develops compact current sensors measuring up to ±1,500A in traction inverters

The HSTDR sensors address issues such as limited space, cross talk from closely positioned busbars, and noise caused by high voltage fast switching. Unlike traditional C-core sensors which are bulky and require large apertures to slide onto complex busbars, the LEM HSTDR sensor has an integrated busbar which allows it to be easily placed in the inverter. Despite its smaller size (up to 75% smaller than a traditional sensor at 29x21x12mm and 27g), the LEM HSTDR can measure up to 1500A without saturation.

This allows the magnetic core’s aperture to be reduced significantly, reducing both the size and weight of the sensor compared to traditional C-core sensors. The HSTDR measures only 29x21x12mm and weighs 27g, but can still measure up to 1500 A. It also offers protection against cross talk due to its air gap comparable to C-shape cores.

The package has a 16.5mm creepage with PLC3 for busbar mounting with a connector, a flexible busbar design, and is automotive qualified to operate between -40°C to 125°C.

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