描述 Description

VF401 是一款高性能的數字式雙線 MR（磁阻）傳感器，采用小型扁平式的 TO-92 塑料封裝，帶有電流輸出端口，專為細間距環(huán)形磁鐵的感測而設計。
獨特的 VF401 橋布局（專利號 6297628 ）經過優(yōu)化，允許目標和傳感器之間存在較大氣隙，減小傳感器信號或精度的損失。
VF401 對跑偏（傳感器位置相對于環(huán)形磁鐵內徑或外徑的漂移）的靈敏度降低。而且它對傾斜誤差（與信號元件和環(huán)形磁鐵平行位置的偏差）的敏感度也降低，允許誤差高達 10°。而典型的環(huán)形磁鐵傳感器僅為 2°至 3°，并且受扭轉（電橋槽相對于磁極轉換與理想角度位置的偏差）的影響更小。

特性 Features

·Robust design operating from -40 °C to 150 °C [-40 °F to 302 °F] can withstand short durations up to 175 °C [347 °F], allowing use in potential applications with extreme temperature requirements.
·Not damaged by reverse polarity voltages when customer-supplied sense resistor is installed, enhancing protection.
·Patented MR bridge optimized for stable sensing of 20- to 50-pole pair ring magnets with improved insensitivity to run-out, tilt and twist.
·2-wire digital current output simplifies wiring and interfacing which can reduce total system cost.
·Enhanced sensitivity, ±7 Gauss typical, allows for larger air gaps (up to 2,5 mm [0.098 in]) and higher pole density (up to 50-pole pairs depending on ring diameter).
·One pulse per pole pair output and differential bridge operation allow compatibility with differential Hall sensors which can make it easier to upgrade existing applications.
·Wide speed capability provides application flexibility with true zero speed sensing and operation up to 3000 Hz.
·Output pattern independent of gap between target and sensor.
·RoHS-compliant materials meet Directive 2002/95/EC.

應用 Application

Transportation
· Speed encoding using a multipole ring magnet
· Enhanced accuracy rotational position sensing
· Wheel speed sensing
· Window lift applications
· Speed and direction sensingIndustrial
· Shaft speed encoding using a multipole ring magnet
· Enhanced accuracy rotational position sensing
· Precision motor speed measurement
· Speed control in machine tools
· Elevator speed sensing
· Speed control in motorized industrial equipment Medical
· Shaft speed encoding using a multipole ring magnet