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 responsivenes...