参数资料
型号: 12217
厂商: NVE Corp/Sensor Products
文件页数: 113/145页
文件大小: 0K
描述: MAGNET 3.5MM DIA X 4MM THICK
标准包装: 10
系列: *
其它名称: Q7078272A
Application Notes
GT Sensor Operation with Magnetic Encoders
Magnetic encoders generate their own magnetic field, so they are much easier to work with than gear
tooth wheels, as no bias magnet is required for the sensor. Also, magnetic encoders have alternating
north and south magnetic poles on their faces. Therefore the magnetic field is generated by the moving
body, and sensor offset problems are greatly reduced. The following drawing shows a GT Sensor
response to a magnetic encoder:
GMR Sensor
Direction of Sensitivity
GMR Sensor
Resistors R3, R4
Resistors R1, R2
Voltage Output of
GMR Bridge
Rotation
S
N
GMR Sensor
Resistors R3, R4
S
N
GMR Sensor
Resistors R1, R2
Voltage Output of
GMR Bridge
Rotation
S
GMR Sensor
Resistors R3, R4
N
S
N
GMR Sensor
Resistors R1, R2
Voltage Output of
GMR Bridge
Rotation
S
GMR Sensor
Resistors R3, R4
N
S
N
GMR Sensor
Resistors R1, R2
Voltage Output of
GMR Bridge
Rotation
S
N
S
N
Note that in this case, as long as the sensor is positioned symmetrically with the encoder, offset is
minimized. Also note that the GT Sensor provides one full sine wave output for each magnetic pole.
This is double the frequency of a Hall effect sensor, which provides one full sine wave output for each
north-south pole pair. As a result, replacing a Hall sensor with a GT sensor doubles the resolution of
the output signal.
- 113 -
www.nve.com phone: 952-829-9217 fax: 952-829-9189
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