New Series of ams Magnetic Position Sensors Enables World’s Best Accuracy at High Rotation Speeds
June 23 2014 - 1:24AM
Business Wire
AS5047D, AS5147 and AS5247 with
new DAEC™ compensation technology in a single-chip
solution reduces dynamic angle error to almost
zero
ams AG (SIX: AMS), a leading provider of high performance analog
ICs and sensors, today introduced a new series of magnetic position
sensors featuring a breakthrough technology capable of producing
extremely accurate angle measurements of rotors spinning at high
speed.
The new “47 series” position sensors include the AS5047D, AS5147
and AS5247 with DAEC™ (Dynamic Angle Error Compensation), a
patent-pending technology developed by ams that eliminates the
measurement error attributable to propagation delay.
- The AS5047D is ideally suited for
industrial applications including robots and encoder modules.
- The AS5147 is an AEC-Q100 qualified
part for automotive applications such as electronic power steering
and pumps.
- The dual-die AS5247 (also AEC-Q100
qualified) is well suited for automotive applications requiring the
highest level of functional safety compliance.
All three parts are specified with a maximum ±0.17° angle error
(excluding integral non-linearity).
This precision measurement performance is the result of
implementing DAEC, an algorithm which performs error compensation
internally and responds automatically to changes in the speed of
rotation. Traditional magnetic rotary position sensor ICs suffer
from a propagation delay (typically 100-200µs) as they convert raw
measurements of magnetic field strength at their embedded magnetic
elements into digital angle measurements. During this delay, a
spinning rotor’s angular displacement changes, so that its actual
position when the digital output leaves the sensor differs from its
measured position.
The resulting error increases in a linear fashion with increases
in the speed of rotation: for a propagation delay of 100µs, at
1,000rpm the dynamic angle error is 1.2° and at 10,000rpm it is
12°.
DAEC almost completely eliminates this source of error,
dynamically compensating every measurement sample for the speed of
rotation at the time the sample is captured. The 47 series sensors
provide angle measurements accurate to ±0.08° at 7,000rpm, to
±0.14° at 12,000rpm and to ±0.17° at 14,500rpm.
With its extreme accuracy, the ams 47 Series is ideally suited
to all motor control and angle measurement applications. In
high-speed brushless DC (BLDC) motors and permanent magnet
synchronous motors (PMSM) the sensor’s high accuracy enables better
execution of the commutation scheme, resulting in higher torque and
efficiency, lower torque ripple and smoother operation.
All three devices provide absolute position measurements as a
digital PWM output, and UVW outputs for use in field-oriented
commutation schemes. They also provide an incremental ABI output
equivalent to the output of an optical encoder. This means an
AS5047D IC can replace an optical encoder without requiring the
user to change the software interface in the host system’s
microcontroller or DSP.
The 47 Series devices offer high 14-bit resolution (to 0.022°)
in their digital SPI output, and maximum resolution of 2,000 steps
per revolution in decimal mode and 2,048 steps per revolution in
binary ABI mode.
Like all ams magnetic position sensors, the new 47 Series
benefits from a proven differential sensing technique, which offers
immunity to stray magnetic fields and enables the devices to be
used in electrically noisy environments without any requirement for
shielding.
“The introduction of the 47 series marks a radical step forward
in magnetic position sensor technology,” said Bernd Gessner, Vice
President and General Manager of the Automotive Business Unit at
ams. “For the first time, designers of high-speed motors can use
robust, compact magnetic position sensors without the need to
implement a complex error compensation scheme in an external
microcontroller or DSP.”
The AS5047D, AS5147 and AS5247 will be displayed in the ams
booth (stand 909) at the Sensors Expo, Chicago, 24-26 June
2014.
The AS5047D is available for sampling in a 14-pin TSSOP package.
It is priced at $4.21 in 1,000-piece quantities.
The AS5147, priced at $4.84, is also in a 14-pin TSSOP
package.
The AS5247, priced on request, is in an MLF-40, 7mm x 7mm
package
General product availability end of July 2014. For more
information on the 47 series please visit our website at
www.ams.com/Magnetic-Rotary-Position-Sensors/
Download Press Pictures or Block Diagram at
http://www.ams.com/eng/Press/Press-Releases/
ams AGPatricia Moosburger, Media Relationsphone: +43 (0)
3136 500 31235press@ams.comwww.ams.com
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