Detection of brushless motor rotarion

A brushless motor, the mainstream at present, has achieved downsizing and loss reduction by incorporating Hall

elements, providing the highly accurate rotation control.

This is the most popular method for small-sized motors. We introduce the most typical hall motor applications here.

 

Detection of motor rotation with Hall elements                                                                                             
-- Advantages of using Hall elements
   1. High durability due to non-contact detection 
   2. Highly resistant to contamination such as dust, dirt, or oil, because of detection of magnetism
   3. Downsizing, weight reduction, and loss reduction are possible.

 

Principle                                                                                                                                                         
A Hall effect IC can obtain the analog output corresponding to the strength of the magnetic field and uses these

characteristics to detect the rotor position.

If one or multiple Hall elements are allocated in parallel on the stator side opposite to the magnet pole of the motor

rotor, the rotor position can be detected from the magnet allocation, enabling the detection of the rotation.

 

Configuration examples                                                                                                                                
Here, the typical example in which three Hall elements are placed at locations offset by 60 degrees each other

on a 4-pole rotor and the index detection example.

 

-- Configuration 1
    A 4-pole rotor and three Hall elements are used to detect the rotation.

 

-- Special features

    A maintenance-free motor can be implemented. 
    Application-specific design is possible.
    Stable activation and low vibration allow a quiet operation.

 

 

Recommended applicable products                                                                                                              
HW / HS series

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