Brushless motor and handheld electric tool employing same

Abstract

The present invention relates to a brushless motor, and the brushless motor comprises a stator having a front side and a rear side, wherein the stator comprises a front insulating frame located at thefront side of the stator, and a rear insulating frame which is located on the rear side of the stator; a rotor which is provided with a front side and a rear side, is mounted in the stator, and comprises a rotating shaft rotating about a first axis; a front bearing which is mounted at the front end of the rotating shaft; a rear bearing which is mounted at the rear end of the rotating shaft; a front end cover which is located on the front side of the rotor, wherein the front end cover is installed on the front bearing; a rear end cover which is located at the rear side of the rotor, wherein the rear end cover is installed on the rear bearing and abuts against the rear insulating frame; a plurality of first buckling parts are arranged on the front side of the front insulating frame; the front end cover is provided with a plurality of second buckling parts in the circumferential direction; and the first buckling part is connected with the second buckling part in a buckling manner. According to the brushless motor, the number of parts of the integrated motor is reduced, the assembly process is simplified, the manufacturing cost is low, and the coaxiality of the stator and the rotor ofthe brushless motor is high.

Description

technical field [0001] The invention relates to a motor, in particular to a brushless motor and a hand-held electric tool using the brushless motor. Background technique [0002] In the existing hand-held electric tools, the installation method of the split brushless motor is to install the stator inside the casing separately, install the rotor directly in the casing separately, and position the rotor through the casing, and additional adjustment is required The air gap between the stator and the rotor is different due to the deformation of the casing and other reasons. The air gap between the stator and the rotor of different batches of hand-held electric tools is different, and the coaxiality of the stator and the rotor cannot be guaranteed, resulting in unreliable motor performance. Therefore, the demand for integrally assembled motors is urgent. In addition, due to the development trend of miniaturization of hand-held electric tools such as electric drills, screwdrivers,...

AI Technical Summary

Problems solved by technology

In order to position the stator axially and radially, the above-mentioned brushless motor needs to be equipped with a connecting piece connecting the front end cover and the rear end cover. Although the volume of the brushless motor is reduced, the manufacturing cost and the complexity of assembly are increased.

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