March 19, 2015 – ams (Country Manager Lee Jong-deok), a specialist in high-performance analog ICs and sensors, announced the launch of a new product in the 47 Series, a magnetic rotary position sensor suitable for motor and motion control applications. The new 47 Series product provides faster rotational speeds and high-resolution incremental ABI signal output.

Like existing products in the 47 series, the new AS5047P features ams’s DAEC™ (dynamic angle error compensation) technology, which enables angle measurement with excellent precision even at very high rotational speeds. The high-speed performance of the 47 series magnetic sensor and the incremental ABI output are ideal enough to perfectly replace optical encoders. The total system cost of a 47 series-based design is significantly lower than when using equivalent optical encoders or resolvers.

With the new AS5047P sensor, the maximum measurement speed has been increased from 14,500 rpm to 28,000 rpm, enabling support for numerous high-speed rotary axis applications where only optical encoders could previously be used.

ams has increased the number of steps per resolution in the incremental ABI output of the device. The ABI output of the 47 Series is equivalent to that of a standard optical encoder. Therefore, motor control system designers can easily replace optical encoders with ams’s magnetic position sensor measurement system without changing the control software or interface currently in use. In the AS5047P, the maximum resolution of the ABI output is increased to 4,000 steps/1,000 pulses per revolution in decimal mode and to 4,096 steps/1,024 pulses per revolution in binary mode. This means that a wide range of optical encoders can be replaced with magnetic position sensors that have equivalent resolution performance.

In addition, through the AS5047P's standard 4-wire SPI serial interface, the host microcontroller can not only read 14-bit absolute angular position data via the AS5047P but also program non-volatile settings without a dedicated programmer. This device provides a standard UVW communication interface for use with brushless DC motors, eliminating the need for separate Hall sensor switches and offering a single IC to support both motor position and application control. The absolute angular position can also be provided as an encrypted PWM output signal.

Like all ams magnetic position sensor products, the AS5047P is highly resistant to interference from stray magnetic fields and is completely unaffected by dirt, dust, grease, moisture, and other contaminants that degrade optical encoder performance.

The DAEC technology applied to the AS5047P provides a function to compensate for dynamic angle errors caused by the transmission delay required when the sensor processes raw magnetic field strength. Therefore, DAEC eliminates the need for system designers to implement separate error correction circuits in external DSPs or MCUs. The AS5047P with DAEC technology achieves very high precision, measuring up to 0.34° at a constant rotational speed of 28,000 rpm (excluding basic nonlinearity).

Heinz Oyrer, Senior Marketing Manager for ams’ position sensor business unit, stated, “Unlike optical encoder solutions, the AS5047P position sensor lowers system costs while providing resilience unaffected by harsh environments where axial and radial tolerances exist.”

AS5047P is currently available in mass production quantities and is priced at $4.63 per unit based on a quantity of 1,000.

The AS5047P evaluation board is available through ams's online site. Samples and technical information can be found at www.ams.com/magnetic-position-sensor/AS5047P.

Video demos and detailed information on ams's magnetic position sensors can be found at www.ams.com/magnetic-position-sensors.