Reduce EV range anxiety and improve safety using integrated FOC motor control and advanced sensors
Conclusion Integrated sensorless FOC BLDC motor drives, along with current sensors, magnetic position sensors, and rotation sensors, are key components enabling the design of efficient and safe xEVs with greater driving ranges and lower carbon footprints. The use of FOC motor drives, in particular, enables the design of more efficient and quieter cooling systems with improved dynamic response for battery packs and traction inverters. For their part, compact, accurate, and energy- efficient sensors are critical to the development of xEVs that meet the reliability demands of advanced driver assistance systems and the functional safety requirements of ISO 26262.
Speed and direction: The ATS19520LSNBTN-RSWHPYU is a vibration-tolerant, differential Hall-effect transmission speed and direction gear tooth sensor, with models available for forward and reverse direction sensing (Figure 7). The ISO 26262 ASIL B-rated sensor has integrated diagnostics and is suited for use in xEV drive trains. The three-pin, single-in- line package (SIP) includes an integrated back bias magnet to measure the speed and direction of rotating ferrous targets, and an integrated capacitor to ensure electromagnetic compatibility.
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Figure 7: The shown “F” variant of the ATS19520 measures forward rotation when a gear tooth passes from Pin 1 to Pin 3 (top), and reverse rotation when a gear tooth passes from Pin 3 to Pin 1 (bottom). The “R” variant measures the rotation in the opposite directions. (Image source: Allegro MicroSystems)
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