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Motor drive systems, the backbone of industrial automation, robotics, and electric vehicles, rely on sensors as their "nervous system" to enable precise control, efficient operation, and fault prevention. These sensors monitor critical parameters—such as current, voltage, rotor position, speed, and torque—converting physical signals into actionable data for controllers. Below, we explore their defining features and stringent performance requirements.

Hall sensors, leveraging the Hall effect (the generation of a voltage difference across a conductor when exposed to a magnetic field perpendicular to current flow), are pivotal in detecting magnetic fields, currents, positions, and more. Among their variants, closed - loop and open - loop Hall sensors differ markedly in architecture, performance, and applications, while sharing fundamental principles. This essay delves into their similarities, differences, and practical ramifications.

The rapid adoption of 800V high-voltage platforms in new energy vehicles (NEVs) has revolutionized charging speed and efficiency, but it also introduces critical safety challenges for Battery Management Systems (BMS). One key issue is ensuring accurate and safe voltage sampling of the high-voltage battery pack, which directly impacts vehicle performance and user safety. Hall effect voltage sensors have emerged as a vital solution to these challenges.