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Date: 01-11-14

0.5 Degree angle error rotation sensor for automotive motor angle measurement

Analog Devices introduced precision, high speed magnetic angle sensor ADA4571, which the ADI claims is four times more accurate (0.5° max), 60 percent faster and uses 40 percent less power than competing angle sensors.

The automotive qualified ADA4571 directly measures motor position to reduce noise, particularly in case of brushless DC (BLDC) motors. The new sensor has built-in analog IC and sensing element based on Anisotropic Magneto-Resistive (AMR) technology. The new sensor enables direct, non-contact and wear-free angle measurement in motor applications, including automotive systems such as electric power-assisted steering, braking, active suspension and stability control.

The IC inside ADA4571 help it to operate independently of magnet drifts due to lifetime, thermal influences or mechanical stress and so it delivers higher accuracy resulting in more effective commutation of the motor and better control of torque and speed performance especially in low RPM applications.

The new sensor however support high-speed motor operation up to 50,000 RPM. The direct angle measurement principle reduces the effects of vibration and noise that can degrade motor performance. Better torque control improves motor efficiency, lowers emissions and heat and extends operating life. Additionally, the low phase delay (2µs) enables fast closed loop control and improves responsiveness in high-dynamic applications such as industrial servo motors, robotics and electric power steering.

ADA5471 operate from a DC 2.7- to 5.5-V supply by drawing a current of 6.5 mA with low-power sleep mode. Sensor is protected against high magnetic field conditions and has negligible hysteresis; while the low temperature and lifetime drift performance reduces or eliminates the need for calibration. The sensor also supports advanced diagnostics for use in high availability and safety critical applications.
ADA4571 Magnetic Angle Sensor features low angular error of 0.5° max , low noise: 500 uVrms and operating temp range of -40°C to 150°C.

ADA4571 is priced at $1.98 each for 10 K quantity
Package: 8-lead SO

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