Detection of rotation speed

Currently, a rotating part such as a small-sized motor is widely used in various fields. To control the rotating part, highly accurate speed detection is one of the essential technologies. We introduce some examples to detect the rotation speed using Hall effect ICs with integral hall sensors here.

 

Detection of rotation speed using Hall effect IC

High durability due to non-contact detection
Highly resistant to contamination such as dust, dirt, or oil, because of detection of magnetism
Easy subsequent signal processing due to digital output
Downsizing is possible.


Principle                                                                                                                                                                                          

A Hall element can obtain the output proportional to the magnetic flux density owing to its principle.
Placing magnets in series on a rotating part enables the detection of the rotation speed from the allocation of the magnets or from the detection of the number of poles and magnetic flux. The Hall effect IC employs the ON/OFF digital output to facilitate the subsequent processing.                           

                     

 

Configuration examples

Here, two typical configuration examples to obtain the magnetic flux density distribution proportional to the travel amount.

 Configuration 1; Pulse encoder
The Hall effect IC integrating a Hall element and signal processing IC into a package is used.
The rotor rotation speed can be detected by detecting the magnetic field.               

 

                     

 

 Configuration 2; Flowmeter
Using Hall effect ICs on a flowmeter in addition to a pulse encoder can implement a downsizing and highly accurate measurement.

 

 

 

 

 

 

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