Miniature brushless DC motor

Abstract

The invention discloses a miniature brushless DC motor. The miniature brushless DC motor is characterized by comprising a case and a rear cover, wherein the case and the rear cover are fixedly connected, a stator coil and a rotor part are arranged in an inner cavity of the case, the stator coil is fixedly arranged, the rotor part comprises a rotor shaft, a shaft sleeve and four blocks of magnetic steel, a front shaft end and a rear shaft end of the rotor shaft are separately in slewing bearing by a front bearing and a rear bearing which are arranged in the case and the rear cover, the shaft sleeve fixedly sleeves the rotor shaft, the end surface of the front end of the shaft sleeve props against the end surface of the inner side of the front bearing by a rubber gasket and an adjustment gasket, the end surface of the rear end of the shaft sleeve props against the end surface of the inner side of the rear bearing by a spring, the four blocks of magnetic steel are fixedly pasted at an outer circle of the shaft sleeve by adhesives, and an adhesive tape is further wound around the outer circle formed by the four blocks of magnetic steel. The miniature brushless DC motor has the advantages of small appearance size, simplicity in structure, high quality and reliability in high-speed running.

Description

technical field [0001] The invention relates to a miniature brushless DC motor. Background technique [0002] Compared with the traditional DC motor, the micro brushless DC motor cancels the brush and commutator, has higher reliability and higher speed, and can also be smaller in structure size. The miniature brushless DC motor of the prior art includes a fixedly connected casing and a rear cover, the inner cavity of the casing is provided with a stator coil and a rotor part, the stator coil is fixedly installed, the rotor part includes a rotor shaft, a bushing and a magnetic steel, and the rotor The front and rear shaft ends of the shaft are slewing supported by the bearings installed in the casing and the rear cover respectively. The shaft sleeve is fixedly sleeved on the rotor shaft, and the magnetic steel is fixed on the outer circle of the shaft sleeve. Due to the need to meet the high-speed operation requirements, adjacent The connection between the magnetic steels ne...

AI Technical Summary

Problems solved by technology

The miniature brushless DC motor of the prior art includes a fixedly connected casing and a rear cover, the inner cavity of the casing is provided with a stator coil and a rotor part, the stator coil is fixedly installed, the rotor part includes a rotor shaft, a bushing and a magnetic steel, and the rotor The front and rear shaft ends of the shaft are slewing supported by the bearings installed in the casing and the rear cover respectively. The shaft sleeve is fixedly sleeved on the rotor shaft, and the magnetic steel is fixed on the outer circle of the shaft sleeve. Due to the need to meet the high-speed operation requirements, adjacent The magnetic steel needs to be strengthened by mechanical buckle connection, which makes the structure of the motor complicated, and the size of the motor cannot be further reduced

In addition, the micro-brushless DC motor in the prior art has no reliable axial limit on the rotor shaft, and it is easy to produce axial movement during operation, which affects the reliability of the motor's high-speed operation

Images