Contactless 360° high-speed angular position measurement

With the HAL 302x from TDK Micronas, Rutronik presents a family of fast 2D angular position sensors that satisfy the demand for stray-field-robust motor position sensing and ISO 26262-compliant development. This sensor family has differential or single-ended sine and cosine analog outputs for standardised angle calculations by an external MCU or an ECU. Both types in this series, HAL 3020 and HAL 3021, use Hall effect technology to measure vertical magnetic field components (BZ) and over a 360° angle of rotation.

The two sensors differ mainly in the number of horizontal plates. Fluctuations in the supply voltage or temperature can cause measurement errors. The measuring principle of the Hall plate arrangement minimises this source of error. The Hal3020 features three horizontal plates and is designed for lower power consumption applications. In comparison, the HAL3021 features six horizontal plates, offering improved robustness against static and dynamic mechanical tolerances, a higher SNR, and support for narrower air gaps and smaller target magnets.

Thanks to the fast response time and high output bandwidth, they are ideal for motor applications with up to 60,000rpm in the market segments of light e-mobility (e-bikes, e-scooters, monowheels), industrial robotics, and agricultural and heavy machinery, among others. Another advantage of the sensors is that motor commutation and load position measurements can be supported thanks to the high-speed measurement capability and high accuracy of HAL 302x.

Application examples include rotor position measurement, power trains, chassis and safety, and wiper motors.