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.
