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Understanding Speed Sensing with Hall Effect Sensors: Applications and Advantages

This article explores the principles of speed sensing using Hall Effect sensors, a technology discovered by Dr. Edwin Hall in 1879. Hall Effect sensors are crucial for monitoring rotational speeds in systems like Team Hybrid's drive-train, allowing for effective power adjustments. We discuss how these sensors work, the importance of Hall voltage, and their output types (analog and digital). Additionally, we highlight the advantages of non-contact operation, resilience to environmental factors, and various applications, including motion sensing, fuel injection, and ABS systems.

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Understanding Speed Sensing with Hall Effect Sensors: Applications and Advantages

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Presentation Transcript

  1. Speed Sensing(the Hall Effect) John Hoyt

  2. Need for Speed Sensors • Team Hybrid may use a drive-train system that uses drive shafts driven by separate components. If this is the case, the ability to monitor the rotational shaft speeds and adjust power accordingly will help the overall system perform effectively.

  3. Background • Dr. Edwin Hall discovered the Hall effect, which bears his name, in 1879. • If a conductive material is placed in a magnetic field (with the field oriented perpendicular to the material) and a current is passed through the length of the material, a voltage drop will be produced across the width of the material.

  4. The Hall Effect • V = IB/(ned) • V is the Hall voltage across the material • I is the current • B is the magnetic flux density • n is the “bulk density of the carrier electrons” • e is the electron charge • d is the material thickness

  5. Speed Sensing • Fit a magnet (or two) to a rotating shaft • Mount a Hall Effect sensor near the shaft (explained later) • As the magnet nears the sensor, the Hall voltage will rise, until it spikes as the magnet passes by

  6. Hall Effect Sensors • Produce an output voltage which is very small, and must be amplified in order to be used • Two types of outputs • Analog • Digital

  7. Analog Output

  8. Digital Output

  9. Advantages • Does not require physical contact to work which eliminates possible wear • Not affected by outside elements such as dirt, dust, water, or any combination of these

  10. Applications • Motion sensing • Power sensing • Position sensing • Ignition and fuel injection systems • Speed sensing • ABS systems

  11. Resources • autopartscorner.com • electronicproducts.com • honeywell.com • howstuffworks.com • hyperphysics.phy-astr.gsu.edu • sensorsmag.com • wikipedia.com • “The Hall Effect” by Jacob Wernhoff

  12. Questions

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