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What are the advantages and disadvantages of brushless motor with Hall sensors and brushless motor without Hall sensors?


The advantages and disadvantages of brushless motors with Hall sensors and without Hall sensors are summarized as follows:

Advantages of having Hall sensor:

Built-in Hall sensor can detect the position of the rotor and achieve smooth start;

The motor can start at zero speed thanks to the Hall sensor.

Disadvantages of having a Hall sensor:

The price is higher, more expensive than Hall-free motors;

The construction is complex because of the need to integrate Hall sensors.

Advantages of Hall-free:

Longer life and reliability because there are no Hall sensors to break;

Lower cost, no need for Hall sensors or brackets;

Manufacturing is simpler because the traditional need to adjust the Hall angle is omitted.

Disadvantages of Hall-free:

The startup is not smooth because the Hall sensor is missing to detect the rotor position, so the drive part needs to perform zero-point current detection, which may cause the motor to vibrate when starting, or even fail to start;

Not suitable for applications with large loads or large load changes;

There is a Hall driver that cannot drive this kind of motor.

In summary, depending on the specific application needs and budget considerations, choose whether to use a brushless motor with a Hall sensor or a brushless motor without a Hall sensor. In some special applications, Hall sensors, drivers, encoders and reduction gearbox may be selected according to customer requirements to meet specific needs.

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