TDK introduces Hall effect position sensors for high speed motors

     TDK has introduced the Micronas Fast 2D Hall Effect position sensor family HAL 302X to meet the demand for position detection against stray field motors in automotive and industrial applications and for development in compliance with ISO/26262 standards. This new sensor family initially contains two members, HAL 3020 and HAL 3021, with differential and unipolar chord and cosine analog outputs for standard Angle calculations with external microcontrollers/ECUs.

     HAL 3020 is suitable for high cost performance applications such as electric pumps or electric valves. For these types of application scenarios, the sensor can be easily integrated with TDK's Micronas embedded motor controller product family for more precise and secure motor control. HAL 3021 is suitable for demanding high speed sensing applications such as electric power steering, electric motors (E-axis), electric brake booster and electromechanical brake (EMB).

     The HAL 302x sensor can measure the full rotation Angle of 360° by evaluating the vertical magnetic field component (BZ). The HAL 3020 uses three horizontal Hall plate arrays, while the HAL 3021 uses six. Both sensors suppress external DC and AC stray fields (ISO 11452-8). A simple and cost-effective coaxial (axle-end) configuration of a bipolar ferrite magnet is sufficient to measure the absolute angular position by calculating the suppression of harmonic interference in the stimulus signal within the device. The inherent stray-field robustness eliminates the need for expensive magnetic shielding and the use of stronger target magnets. This provides greater flexibility in the design and production of next-generation motors for hybrid and electric vehicles.

     A key advantage of HAL 3021 is that the device provides best-in-class robustness against static and dynamic mechanical misalignments such as off-axis displacement, air gap variation, and tilt. This ensures a high degree of reliability and efficient field-oriented control over the lifetime of the motor. To reduce the load on the ECU, the sensor can compensate for major sensor and system-level nonideal factors such as sine and cosine amplitude Angle mismatches, offset errors, (absolute) 0 Angle errors, and orthogonal errors on chip.

     HAL 302X has been defined as an Independent Safety Element (SEooC) ASIL C class according to ISO 26262, supporting system-level integration up to ASIL D class. The sensor integrates various security monitoring functions to help improve diagnostic coverage and simplify external security oversight on the ECU side. The sensor operates at junction temperatures ranging from -40℃ to +170℃ and is packaged in a small eight-pin SOIC8 SMD package.