Texas Instruments TIDA-060040, Manual

Page: 26 / 33

Figure 3-13. In-Plane Configuration
In-Plane Mechanical Angle Error shows the resulting pre-calibrated error captured for this alignment.
Angle (deg)
A
ngle E
rror (d
eg)
0 45 90 135 180 225 270 315 360
-12
-10.5
-9
-7.5
-6
-4.5
-3
-1.5
0
1.5
3
4.5
6
7.5
9
10.5
12
CORDIC Output Error
Calculated Arctangent Error
Figure 3-14. In-Plane Mechanical Angle Error
The angle error shown for the in-plane alignment appears quite extreme. With the assembly alignment errors for
this test setup, a very dramatic angle error resulted. Even with this extreme of an error, it is still possible to apply
a calibration to the end result to achieve accuracy below 0.1°.
Table 3-3. In-Plane Harmonic Correction Factors
HARMONIC α
i
β
i
1 5.33 2.68
2 –0.5 –1.22
3 –0.26 0.51
4 0.17 0.05
5 –0.04 –0.02
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26 Absolute Angle Encoder Reference Design With Hall-Effect Sensors for
Precise Motor Position Control TIDUC07 – MARCH 2022
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