Resolver enables flexible motor sensor placement

Melexis has introduced a 5-V variant of its MLX90381 Triaxis pico-resolver for compact motor systems that rely on a 5-V supply. As motors become smaller and mechanical space more constrained, integrating accurate rotor position sensing becomes more challenging, particularly when end-of-shaft sensing is not possible. The MLX90381’s resolver-based position sensing provides greater flexibility in sensor positioning than TMR-based solutions, making it suitable for automotive, alternative mobility, and robotics motor applications.

Housed in a compact DFN-6 package measuring 2.0×2.5×1.0 mm, the MLX90381 combines Triaxis Hall technology with high-speed sine and cosine analog outputs. Its ability to sense magnetic flux density in three dimensions and use selectable X/Y, X/Z, or Z/Y magnetic axis pairs allows flexible sensor placement relative to the rotating magnet. In side-of-shaft and through-shaft motor designs, the sensor can be placed below or close to the magnetic track, reducing mechanical constraints and simplifying PCB placement and tolerance management in compact assemblies.

The MLX90381 5-V provides a 2-µs output refresh rate and measures rotational speeds above 50,000 rpm for precise rotor position detection in DC, BLDC and PMSM motors. Programmable sensitivity and filter bandwidth enable performance optimization, while I²C supports device configuration and production calibration.

Samples of the MLX90381 5-V are available now. Target use cases include e-valves, robotic actuators, cadence sensing, and motor applications for braking, steering, and seating.

MLX90381 product page

Melexis

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