参数资料
型号: US5881ESO
厂商: Melexis Technologies NV
文件页数: 38/46页
文件大小: 498K
描述: IC HALL EFFECT SW SOT-23
标准包装: 1
传感范围: 30mT 跳闸,9.5mT 释放
类型: 单极开关
电源电压: 3.5 V ~ 24 V
电流 - 电源: 5mA
电流 - 输出(最大): 50mA
输出类型: 数字式,开漏极
工作温度: -40°C ~ 85°C
封装/外壳: TO-236-3,SC-59,SOT-23-3
供应商设备封装: SOT-23
包装: 剪切带 (CT)
其它名称: US5881ESOCT
Gear Tooth Sensor Magnetics
In order to detect the passing gear teeth with a Hall effect sensor it is necessary to provide a source of
magnetic energy. The simple way to do this is to arrange a permanent magnet such that the axis of mag-
netization is pointing toward to surface of the gear teeth. As a tooth moves across the surface of the
magnet the flux will become attracted to the lower reluctance path provided by the ferrous steel struc-
ture. When this occurs the flux density measured by the Hall element between the face of the sensor and
the gear tooth increases. Many schemes have been developed and some patented that use the various
attributes of the vector flux field and its changing nature to create zero speed Hall effect gear tooth sen-
sors. Melexis has chosen to work with digital signal processing schemes and in this way minimize the
magnetic circuit manipulation required of the end user. Put simply, by applying silicon "smarts" the
magnetic subtlety and slight of hand is nearly eliminated.
Figure 25, Geartooth Flux Transitions
Magnetic modeling courtesy of AnSoft
TM
magnetic modeling software.
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