Magnetic Field Sensor
KMR 360
(preliminary)
General Description
The KMR 360 is a new patented development by HL Planartechnik GmbH. This magnetic field sensor
utilizing the anisotropic magnetoresistance effect. The sensor contains three Wheatstone bridges
rotated by 120(cid:176). A rotating magnetic field (strength > 25 kA/m in the sensor plane) will result in three
sinusoidal output signals phase shifted by 60(cid:176), allowing simple angular evaluation by linear
interpolation. Alternatively, the CORDIC algorithm may be used to calculate the rotation angle more
exactly.
As an additional feature, the KMR360 is able to measure full 360(cid:176) by using an additional magnetic
field, which is generated by a planar coil located on the chip.
Function principle:
Rotating magnet
S N
Rotating axis
Planar coil
MR
Sensor die bridges
Fig: 1 Sensor element and magnet set up for rotational measurement
Circuit model
Fig. 2: The schematic circuit of KMR360.
Function description:
U , U , U , U , U and U refer to the pin name (n=1,2,3) resp..
GND Bn n+ n- coil+ coil-
U are the bridge output voltages, i.e. the voltage difference between pin Un and pin Un.
an + -
In order to power the coil with a positive coil current I , the voltage applied to pin U must be
coil+ coil+
greater than the voltage applied to pin U . In order to power the coil with a negative coil current I ,
coil- coil-
the voltage applied to pin U must be smaller than the voltage applied to pin U .
coil+ coil-
HL-Planartechnik GmbH
Hauert 13, 44 227 Dortmund, Tel.: +49 (0) 231/9740-0, Fax.: +49 (0) 231/9740-20
Internet: http://www.hlplanar.com E-Mail: service@hlplanar.deMagnetic Field Sensor
KMR 360
(preliminary)
Characteristic Curves
The working principle of the KMR360 is shown in figures 3 and 4: Figure 3 depicts the output signals
U respective U of the n=1,2,3 Wheastone bridges with an additional coil field created by alternate
an+ an-
coil current I respective I .
coil+ coil-
KMR360: Output Signals for Alternating Coil Current
(H0=25 kA/m; Icoil=+/- 10 mA)
10,0
8,0
6,0
4,0
2,0
0,0
-2,0
-4,0
-6,0
-8,0
-10,0
0 30 60 90 120 150 180 210 240 270 300 330 360
Field Angle wwww [deg]
HL-Planartechnik GmbH
Hauert 13, 44 227 Dortmund, Tel.: +49 (0) 231/9740-0, Fax.: +49 (0) 231/9740-20
Internet: http://www.hlplanar.com E-Mail: service@hlplanar.de
]V/Vm[
)liocI(n,aU
langiS
tuptuO
Ua1(+)
Ua2(+)
Ua3(+)
Ua1(-)
Ua2(-)
Ua3(-)
Fig. 3: Typical output signal curves without (solid) and with (dashed) coil field for KMR360
KMR360: Difference Signal (H0=25 kA/m, Icoil=+/- 10 mA)
0,300
0,200
0,100
0,000
-0,100
-0,200
-0,300
0 30 60 90 120 150 180 210 240 270 300 330 360
Field Angle wwww [deg]
]V/Vm[
n,aU
(cid:1)
langiS
ecnereffiD
tuptuO
(cid:1)Ua1
(cid:1)Ua2
(cid:1)Ua3
Fig. 4: Signal change due to additional coil field
Fig. 4 shows their difference signals DU = U -U .
an an+ an-
By analysing the signs the calculated angle can clearly be assigned within a range of 0° … 360°.Magnetic Field Sensor
KMR 360
(preliminary)
Specification:
Parameter Condition Symbol Min Typ Max Unit

您好，KMR360磁阻傳感器是一款專門用于檢測(cè)磁場(chǎng)強(qiáng)度和角度變化的精密電子元件。它屬于磁敏傳感器的一種，可能應(yīng)用在電機(jī)控制、定位系統(tǒng)、工業(yè)自動(dòng)化等領(lǐng)域。這款傳感器通?；诨魻栃?yīng)或者磁阻效應(yīng)工作，當(dāng)磁場(chǎng)通過時(shí)，會(huì)改變其內(nèi)部電阻或電壓輸出，從而提供磁場(chǎng)強(qiáng)度和方向的信息。 具體來說，KMR360可能具有高精度、線性響應(yīng)好、抗干擾能力強(qiáng)等特點(diǎn)，可以用于需要精確磁場(chǎng)測(cè)量的設(shè)備中。它的360度全向感應(yīng)意味著它可以在任何方向上感知磁場(chǎng)，適用于需要全方位監(jiān)測(cè)的應(yīng)用環(huán)境。如果您有關(guān)于這款傳感器的具體使用方法、技術(shù)參數(shù)或者兼容設(shè)備的問題，請(qǐng)隨時(shí)告訴我，我會(huì)盡力提供幫助。