ADI claims industry’s highest precision, highest speed magnetic angle sensor

Date
10/28/2014

Categories:
Embedded Systems, Motors & Motion Control, Sensors

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Analog Devices introduced the industry’s highest precision, highest speed magnetic angle sensor. The high-resolution ADA4571 sensor is four times more accurate (0.5° max), 60 percent faster and uses 40 percent less power than competing angle sensors.

The ADA4571 directly measures motor position to reduce noise, optimize smoothness and torque performance, and helps designers of brushless DC (BLDC) motors meet tighter environmental, noise and energy requirements. The new sensor is automotive qualified and integrates a custom, mixed-signal signal conditioning IC and sensing element based on anisotropic magneto-resistive (AMR) technology. The new sensor enables direct, non-contact and wear-free angle measurement in a range of motor applications, including automotive systems such as electric power-assisted steering, braking, active suspension and stability control.

The integrated AMR and precision signal conditioning technology allows the ADA4571 to operate independently of magnet drifts due to lifetime, thermal influences or mechanical stress, which enables high-accuracy readouts in harsh environments.

High-accuracy position feedback information enables more effective commutation of the motor and better control of torque and speed performance especially in low RPM applications. The new sensor also enables high-speed motor operation up to 50,000 RPM while 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.

The ADA5471 runs on a 2.7- to 5.5-V supply, consumes just 6.5-mA of power, and includes a low-power sleep mode that expands application usage to remotely-powered systems. Additionally, the sensor sustains no damage under 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 Key Features
· Low angular error: 0.5° max
· High speed: 50,000 RPM with a 2µs phase delay
· Low noise: 500 uVrms
· Low power: 6.5 mA
· -40°C to 150°C operation

Analog Devices

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