磁性速度传感器

The Future of Automotive Wheel Sensing with GMR

February 23, 2022

P0083 - With the rise of vehicle electrification, computerized control systems, and subsystem reliability monitoring, it has become essential for systems to have accurate rotational information for each wheel of the vehicle.

Giant Magnetoresistance versus Hall-effect: A Comparison of Technologies for Speed Sensor Applications

Allegro MicroSystems giant magnetoresistance (GMR) effect technology offerings build on lessons learned from experience with Hall-effect devices to enable new options for speed sensing system design.

Effect of Ring Magnet Dimensions on Differential Speed Sensor Performance

AN296251 - In this application note, we describe how ring magnet dimensions affect speed sensor performance is given.

Benefits of Dynamic Threshold Feature in ATS16351, GMR Back-Biased Speed Sensor IC

AN296257 - The Allegro ATS16351PSM [1] is a True-Power-On-State (TPOS) sensor providing the speed and position of a rotational ferromagnetic target.

Transmission Gear Tooth Sensing

AN296221 - In this application note learn how our industry-leading, time-proven algorithms included on our transmission ICs have been designed to handle the most stringent application conditions.

Differential Hall-Effect Sensors: Safer and More Reliable for Two-Wheelers of the Future

August 27, 2019

AN296173 - The use of electronic controls for engine, transmission, and wheel speed in two- and three-wheeled vehicles is growing, particularly in developing nations. This trend is largely driven by mandates to improve air quality, fuel efficiency, and vehicle safety worldwide.

EV Traction Motor Requirements and Speed Sensor Solutions

AN296226 - This paper explores the general requirement trends for speed and position sensors in traction motor systems, including high-speed capability, accuracy at startup, low-speed operation, immunity to vibration, EMC robustness, and safety.

Impact of Magnetic Relative Permeability of Ferromagnetic Target on Back-Biased Sensor Output

This application note aims to describe the target relative magnetic permeability impact on Allegro back-biased magnetic sensor output.

Crank Sensor IC for Stop-Start

This article describes start-stop operation and enabling Hall-effect integrated circuits, in particular the Allegro MicroSystems ATS694 and the previous generation ATS658, which are used in this application.

Magnetic Encoder Design for Electrical Motor Driving Using ATS605LSG

This application note describes how to use a Hall sensor device such as the Allegro ATS605LSG as an encoder in a system with a ferrous target, and gives target design recommendations to achieve outputs in quadrature and a 50% duty cycle for each output.

Allegro Differential Speed Sensor System Solutions

Seth Prentice, Strategic Marketing Manager for Allegro MicroSystems Speed Sensor IC group, discusses IC solutions for designing speed sensing applications including automotive transmissions, washing machine drum speeds, and fork lift positioning requiring reliable consistent output signals.

Brochure: Allegro Wheel Speed Sensor ICs

Options to meet your evolving needs.

Brochure: High-Resolution GMR Wheel Sensing

The Allegro A19360 high-resolution wheel speed and distance sensor provides all the robustness of a standard differential speed sensor, but with up to four times the incremental resolution from the same magnetic encoders used today.

Fundamental Properties of Speed Sensors

The aim of this application note is to provide a solid foundation for understanding and comparing the fundamental properties of speed sensors that are valid not only for Allegro products but for speed sensors in general.

Target Design for Hall Transmission Sensors

AN296178 - This application note details the impact of multiple target design parameters on the maximum air gap achievable with Allegro’s ATS692LSH and ATS19520LSN transmission sensors, allowing for measurement of speed and direction of rotating targets.