With Dynamic Angle Error Compensation (DAEC™), a patent-pending technology developed by ams AG, its new “47 series” position sensors eliminate the measurement error attributable to propagation delay. The 47 series includes the AS5047D, AS5147 and AS5247.
Propagation delay (typically 100-200 µs) occurs in traditional magnetic rotary position sensor ICs as they convert raw measurements of magnetic field strength at their embedded magnetic elements into digital angle measurements.
The resulting error increases linearly with increases in the speed of rotation. A propagation delay of 100 µs at 1,000 rpm results in dynamic angle error of 1.2° and at 10,000rpm it is 12°. In contrast, with DAEC dynamically compensating every measurement sample for the speed of rotation at the time the sample is captured, almost all of this error is eliminated. The 47 series sensors provide angle measurements accurate to ±0.08° at 7,000 rpm, to ±0.14° at 12,000 rpm and to ±0.17° at 14,500 rpm. All three parts are specified with a maximum ±0.17° angle error (excluding integral non-linearity).
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