Sensor delivers precision DC motor control

The device is a signal-conditioning and sensing element IC based on Anisotropic Magneto-Resistive (AMR) technology. It provides direct, non-contact and wear-free angle measurements with a maximum low angular error of 0.5°.

A position feedback loop enables more effective torque and speed control in a wide range of BLDC motor control applications. The ADA4571 supports high-speed motor operation up to 50,000 RPM, and the sensor’s direct angle measurement helps reduce vibration and noise that can degrade DC motor performance.

In rugged applications such as industrial servo motors, factory robotics, and electric power steering, the ADA4571’s 2µs low-phase delay and torque control provides rapid closed-loop response which improves efficiency, lowers emissions, and reduces heat, resulting in an extended operating life for the system.     

The integrated AMR coupled with Analog Devices’ precision signal conditioning technology allows the ADA4571 to maintain high-accuracy in noisy environments. The sensor’s low temperature and lifetime-drift performance eliminates the need for calibration. The ADA4571 operates over ‑40 to +150°C, and requires a 2.7 to 5.5V power supply that consumes just 6.5 mA of power. A sleep mode is useful in low power applications, and the sensor also supports advanced diagnostics for use in safety critical applications.