Ams introduces the new 47 series magnetic position sensor for maximum accuracy at high speeds and temperatures

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Inductance

Leading high-performance analog ICs and sensors supplier ams has launched the latest 47 series magnetic rotary position sensor. This new sensor offers higher speed and more accurate incremental output for motor and motion control applications, making it an ideal alternative to traditional optical encoders.

The AS5047P, part of the ams 47 series, incorporates DAECTM (Dynamic Angle Error Compensation) technology to ensure precise angle measurement even at extremely high speeds. With its high-speed performance and ABI incremental output, the 47 series magnetic sensor provides a cost-effective solution that is often more affordable than equivalent optical encoders or resolvers. The design also allows for a significant reduction in overall system costs.

One of the key improvements in the AS5047P is the increased maximum rated speed, which has been raised from 14,500 rpm to 28,000 rpm. This makes it suitable for high-speed shaft applications that previously required optical encoders. Additionally, the number of running steps for the incremental ABI output has been expanded, offering greater flexibility for motor control systems.

The ABI output of the 47 series is compatible with standard optical encoder outputs, allowing motor control designers to use ams magnetic position sensors without modifying existing software or interfaces. In decimal mode, the AS5047P can achieve up to 4,000 steps per revolution, while in binary mode, it can reach 4,096 steps per revolution. This level of resolution ensures that the magnetic sensor can replace optical encoders in a wide range of applications.

The AS5047P features a standard 4-wire SPI serial interface, enabling the main microcontroller to read 14-bit absolute angular position data directly from the sensor. It also supports non-volatile programming without the need for an external programmer. The device includes a standard UVW commutation interface for brushless DC motors, eliminating the need for separate Hall sensors. Additionally, the PWM-coded output signal provides accurate absolute angular position information.

Like other ams magnetic position sensors, the AS5047P is highly resistant to stray magnetic fields and remains unaffected by dirt, dust, grease, and moisture—factors that often degrade the performance of optical encoders. This makes it well-suited for use in harsh and demanding environments.

ams' DAEC technology compensates for dynamic angular errors caused by propagation delays in the magnetic field strength measurements. This eliminates the need for additional error compensation circuitry on external DSPs or microcontrollers. As a result, the AS5047P achieves exceptional accuracy, with a maximum error of only 0.34° at 28,000 rpm, without nonlinear integration.

Heinz Oyrer, Senior Marketing Manager at ams, stated: “The AS5047P position sensor offers lower system cost, smaller size, and improved resistance to stray magnetic interference, as well as better tolerance for axial and radial errors compared to optical encoder solutions. It’s ideally suited for demanding environments.”

The AS5047P is now in volume production, and an evaluation board is available on the ams website. For samples, technical details, or to watch a demo video, visit the ams website to learn more about the magnetic position sensor and its wide range of applications.