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KMT36H 360° Angular Sensor
TYPICAL PERFORMANCE CURVES
0
90
180
270
360
0
90
180
270
360
field angle in deg
field angle in deg
V1(+Icoil) - V1(-Icoil)
V2(+Icoil) - V2(-Icoil)
V1 = Vo2-Vo1
V2 = Vo3-Vo2
V3 = Vo1-Vo3
V3(+Icoil) - V3(-Icoil)
Figure 3 : output voltages
Figure 4 : output voltage change due to coil influence
SIGNAL EVALUATION
180° EVALUATION
As output voltages (V 1 , V 2 , V 3 ) we use the three possible differences between the three signal outputs
(see fig. 3). At first the true offsets must be subtracted from the raw signals. The field angle α in a
180°-range then can be calculated in the following manner:
? 2 ?
?
+ 1 ?
?
α =
1
2
?
? arctan ?
?
?
Vn
Vm
3
?
?
?
?
Using the three possible combinations of output signals (m,n = 1,2 ; 2,3 ; 3,1) three results are
obtained, which can be averaged to increase accuracy. Comparing the three results gives additional
information about their reliability.
360° EVALUATION
In order to distinguish between α and α +180° two additional measurements are needed: one with
positive, the other with negative coil current. In the next step the change in the signals due to the
influence of the coil current must be calculated. The sign of these coil-induced output voltage changes
gives the 360°-information by case differentiation (see figure 4 ). In principle, this 360° discrimination
needs to be computed only once at start up. Nevertheless, it is recommended to check the
measurement periodically.
KMT36H Rev 5
www.meas-spec.com
5/6
2013-April
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