Brushless direct-current (DC) motor

Abstract

The invention belongs to the technical field of brushless direct current motors, discloses a brushless direct-current (DC) motor, and aims at preventing a Hall element from being damaged due to the fact that the temperature of a stator rises. The brushless DC motor comprises a shell, a motor shaft, the stator, a rotor and a magnetic steel piece, wherein a magnetic ring is fixed on the portion, outside the shell, of the motor shaft, the Hall element is mounted on the outer wall of the shell, the distance between the Hall element and the magnetic ring is shorter than an induction range of the Hall element, and the Hall element is connected with a controller. The Hall element is arranged outside the DC motor, the Hall element cannot be affected by the rise of the temperature inside the DC motor and cannot be damaged due to the rise of the temperature of the Hall element. According to the brushless DC motor, the structural mode of a traditional DC motor is broken through, a convention is broken, the Hall element is innovatively arranged outside the shell of the motor, an unexpected effect is obtained, a hard problem which is not solved in a long term is solved, operation troubles of the brushless DC motor can be reduced greatly, and reliability of the brushless DC motor is greatly improved.

Description

technical field [0001] The invention relates to a brushless DC motor with an external Hall element, belonging to the technical field of brushless DC motors. Background technique [0002] With the advancement of motor technology, the performance of brushless DC motors has been continuously improved, showing the advantages of excellent performance, various control methods, material saving, energy saving, and long service life, and has been more and more widely used. However, the weakest link of the existing brushless DC motor is that the Hall element of the brushless DC motor is easily damaged. The Hall element is one of the core components of the brushless DC motor. During the working process of the brushless DC motor, the Hall element controls the brushless DC motor by detecting the position of the magnet. When the Hall element is damaged, the brushless DC motor will stop working immediately and must be repaired. Therefore, the quality of the Hall element is directly relat...

AI Technical Summary

Problems solved by technology

In the structure of the brushless DC motor with Hall element installed, the Hall element is close to the rotor magnetic steel, and because the rotor and the stator are very close, if the temperature of the stator exceeds the rated value, the Hall element will be damaged first. The failure of brushless DC motors caused by component damage is a common fault of brushless DC motors, which reduces the reliability of brushless DC motor operation and affects the wide application of brushless DC motors

This situation has not been effectively resolved, and it has become a hidden danger restricting the development of brushless DC motors, which urgently needs to be improved.

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