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A rotor assembly of a DC motor

A DC motor and rotor technology, applied in the direction of electric components, electrical components, electromechanical devices, etc., can solve the problems of complex assembly structure and affect the stability of the rotating shaft, and achieve the effect of simplifying the assembly structure and saving springs

Active Publication Date: 2019-02-05
NINGBO NEWTHINK MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this prior art has greatly improved the performance of the rotor at high speed, the assembly structure is complex, and the spring force is used to eliminate the impact of the jump, so it has a certain scope of application. When the load exceeds the spring force, it will still affect the stability of the shaft.

Method used

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  • A rotor assembly of a DC motor
  • A rotor assembly of a DC motor
  • A rotor assembly of a DC motor

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Embodiment Construction

[0026] Embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0027] Figure 1 to Figure 8 Shown is the structural representation of the present invention.

[0028] The reference signs therein are: rotating shaft 1, first ball groove 1a, first axial section 1b, first arc center 1c, ball 11, mounting sleeve 2, second ball groove 2a, second axial section 2b, The second arc center 2c, the cage 3, the impeller 4, the bottom plate 41, the upper cover 42, the air inlet 42a, the rotating blade 43, the motor housing 5, the fan end cover 51, the shaft hole 51a, the air guide vane 52, Air guide channel 53, air channel 54, sleeve 9, bearing 91, spring 92.

[0029] A miniature digital DC motor of the present invention includes a motor casing 5 and a stator assembly and a rotor assembly arranged in the motor casing 5 . The rotor assembly includes a rotating shaft 1 on which an impeller 4 and a rotor are installed. ...

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Abstract

The invention discloses a rotor assembly of a DC motor. The rotor assembly comprises a rotation shaft, wherein two first annular ball grooves are formed in an outer surface of the rotation shaft at intervals, an installation sleeve sleeves the rotation shaft and encircles the two first annular ball grooves, two corresponding second ball grooves are formed in an inner wall of the installation sleeve at intervals, and a circle of balls are arranged between the first ball groove and the second ball groove. In the rotor assembly of the DC motor, a bearing is not needed to serve as a rotation connection piece, and the rotation shaft is prevented from moving and swinging due to assembly gaps among an outer ring of the bearing, an inner ring of the bearing and the balls; and meanwhile, a spring between two bearings is saved, the assembly structure is simplified, and the rotation shaft has the advantages of stability and silence under a high rotation speed.

Description

technical field [0001] The invention relates to a motor, in particular to a rotor assembly of a DC motor. Background technique [0002] The rotor assembly of a DC motor may include an impeller that rotates relative to a shroud secured within the turbine. DC motors are mainly used in vacuum cleaners, hand dryers, etc. as the driving source for vacuuming, and the speed of the motor part of the turbine can be as high as 50,000 to 100,000 rpm. At this high speed, the precision of the rotor assembly is very high. The bearings of the rotor assembly will inevitably vibrate during the rotation process. The rotor assembly vibrates due to unbalanced force, which will cause the impeller to vibrate relative to the cover and generate noise. [0003] Patent Application No. 201280041747.0 discloses a rotor assembly comprising a shaft, a bearing assembly, an impeller and a cover, the impeller and bearing assembly are mounted to the shaft, and the cover is mounted to the bearing assembly to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02K7/00
CPCH02K7/003
Inventor 罗千
Owner NINGBO NEWTHINK MOTOR CO LTD