An Introduction to Hall Effect Sensors

A Hall Effect sensor which is a sensor based on Edwin Hall is used to determine its output voltage with regard to a magnetic field.

london, United Kingdom (prHWY.com) August 30, 2012 - A Hall Effect sensor which is a sensor based on Edwin Hall is used to determine its output voltage with regard to a magnetic field. They are mostly used in several applications such as detecting speed, proximity switching and also in current sensing applications. For the Hall Effect, a sensor to work the magnetic field has to be prior known for its distance from the conductor or plate to be produced by the sensor.

For an accurate measurement of the distance, several sensors are strategically placed on stationary part of the motor. This way, all the sensors convey a message which collectively produces a more accurate however not entirely true measurement. There is a magnetic field that is produced when there is electricity passing through a conductor. The magnetic field will vary depending on the amount of current passing through and to determine the amount of current without interrupting the circuit or flow of current, Hall Effect sensors are used.

The sensor is fitted with a circuit that allows it to display the digital on-off voltage signal. This sometimes makes the sensors be called switches by some people. Since these sensors are relatively smaller in size, they are fitted with microprocessors. If there is no magnetic field passing through the conductor which in return means that there is no or very thin electricity, the Hall Effect sensor reads zero voltage. There are several pros and cons of these sensors. Some of the advantages are since the user does not require contact with the sensors, they tend to last longer and have no wear or friction.
This enables an unlimited performance. The sensors are also capable of operating in high speed operations such as above 100 kHz which is impossible for inductive sensors. When the sensors are in place, they are practically protected from air, dust or even water unlike capacitive sensors which can easily be affected by these and cause malfunctions. They are also able to withstand wide temperature ranges from high, mid to low and be able to measure even zero speed. Should the user require to measure large current, the sensors would be ideal for that unlike using capacitive sensors which are limited to only certain a amount of voltage.
However, the Hall Effect sensors also have their own flaws. One of the cons is that these sensors can be affected by any external interfering magnetic field. If there is any magnetic field from another source nearby, it can affect the function-ability of the sensor. They also have a large temperature drift and offset voltage. However, the sensors are far much better for certain applications such as current sensing and speed detection as mentioned earlier than other types of sensors.
The best way of knowing which sensor to purchase is by first understanding the level of voltage that will be needed to be measured. This is because the Hall Effect sensors are designed to measure different amperes of current and hence cost differently. They can be purchased from several electrical shops and websites online as well.
There are many things you can learn about a Hall Effect Sensor http://www.halleffectsensor.org/ , please go through the following useful source about Hall Effect Current Sensors http://www.halleffectsensor.org/hall-effect-current-sensor/ .

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