Brushless direct current motor

Abstract

The embodiment of the invention relates to the technical field of electronics, and discloses a brushless direct current motor. The brushless direct current motor comprises a motor body, a driving control unit and an inversion unit comprising N power switch tube combinations, wherein N is an integer greater than 2. The motor body is electrically connected with the inversion unit. The driving control unit is connected with the N power switch tube combinations, and is used for recording the conduction information of the first conduction of the N power switch tube combinations when the inversion unit is started and controlling the first conduction of the N power switch tube combinations according to the conduction information. According to the brushless direct current motor, the service life of each power switch tube is prolonged, and the service life of the brushless direct current motor is prolonged.

Description

technical field [0001] The embodiment of the present invention relates to the field of electronic technology, in particular to a brushless DC motor. Background technique [0002] At present, the brushless direct current motor (Brushless Direct Current Motor, referred to as "BLCD") has overcome the congenital defects of the brushed direct current motor, and replaced the mechanical commutator with the electronic commutator, so the brushless direct current motor has both the DC motor It has the characteristics of good speed regulation performance, and has the advantages of simple structure of AC motor, no commutation spark, reliable operation and easy maintenance. The essence of the brushless DC motor is a DC power input, using an electronic inverter to convert DC to AC, and a three-phase AC permanent magnet synchronous motor with rotor position feedback. Brushless DC motors have been widely used in home appliances, robots, electric vehicles and other fields. [0003] The inv...

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Problems solved by technology

[0003] The inventors have found that there are at least the following problems in the prior art: when the brushless DC motor starts from a completely static state, the power switch tube in the driver that is first turned on is subjected to a large current impact, while the current driver of the brushless DC drive motor During the start-up process, the power switch tube at the fixed position is often turned on for the first time. After a long time of use, the performance of the power switch tube at the fixed position will decline faster than other power switch tubes, resulting in the power switch tube at the fixed position being different from the other power switch tubes. The performance of other power switch tubes is different, which affects the performance of the brushless DC motor. At the same time, due to the long-term conduction of the fixed-position power switch tube, the damage probability of the fixed-position power switch tube is much higher than that of other power switch tubes. Reduced lifetime of brushless DC motors

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