1 / 12

Speed Sensing (the Hall Effect)

Speed Sensing (the Hall Effect). John Hoyt. Need for Speed Sensors.

malcolm-sandoval
Download Presentation

Speed Sensing (the Hall Effect)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

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

More Related